CN113885195B - Color field correction method for eliminating image deviation of light combining prism - Google Patents
Color field correction method for eliminating image deviation of light combining prism Download PDFInfo
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Abstract
The invention discloses a color field correction method for eliminating image deviation of a light combining prism, which moves a calibration line L R Calibration line L G Calibration line L B In the effective imaging display area S A Left edge is overlapped to form a black calibration line L RGB The coordinates (x, y) of the calibration line at this time are recorded, and an effective imaging display area S is established A Coordinate system O of (2) SA (x, y) establishing a coordinate system O by a mapping function EA (x, y) that is, the pixel P (x 2, y 2) is mapped by P (x 1, y 1), R field, B field and G field repeat this calculation to complete the coordinate mapping of all pixels; coordinate system O SA The gray-scale value of a pixel P (x 2, y 2) on (x, y) is mapped on a coordinate system O EA The pixel P (x 1, y 1) on (x, y) is obtained, R field, B field and G field are repeated to complete the mapping of all pixel gray scale values, thus obtaining the effective imaging display area S A The image of the image can realize the correction of the image deviation without mechanical correction or the image deviation can not be well eliminated by mechanical correction, and the overlapping error is smaller than 1 pixel distance.
Description
Technical Field
The invention relates to the technical field of color field correction, in particular to a color field correction method for eliminating image deviation of a light combining prism.
Background
In the equipment adopting the 3-LCD projection technology, superposition imaging of three color fields is realized by means of a light combining prism. In the process, the projection positions of the color fields are required to be adjusted so as to enable the three fields to coincide, such as the relative positions of the liquid crystal color separation panels and the light combining prism, the positioning frame, the relative positions of the projection surface and the light combining prism and the like, so that the purpose of reducing projection deviation is achieved.
The prior color field correction technology for eliminating the image deviation of the light combining prism has the following defects:
1. the structure technology problem is that the light is adjusted by adjusting the position of the RGB three-color liquid crystal screen and the angle position of the incident light source, so that the liquid crystal pixels of the RGB three colors are completely overlapped on the far-end projection picture. The accuracy of this process is very high, the adjustment is extremely difficult, and the projection deviation is always present and is difficult to control in an acceptable range. As shown in fig. 1, three liquid crystal screens of RGB are emitted to the screen through a light collecting prism (light combining prism) and then through a lens. The geometry of the light combining prism is approximately 20mm by 20mm, and the maximum is 30mm, so that fine tuning is required to adjust the image at the far end according to the millimeter level.
2. On the far-end picture, the three RGB color fields are overlapped, belonging to pixel level overlapping, if deviation occurs, the image will double image, and the color will deviate. Since the image frame is a thousand times enlarged frame on the three RGB liquid crystal screens, the difference of millimeter level needs to be adjusted, so that the mechanical adjustment of micron level is performed on the RGB liquid crystal screen. The operation precision is not matched, so that the color field is hardly overlapped at a perfect position, and the projection deviation is hardly reduced.
Disclosure of Invention
The present invention is directed to a color field correction method for eliminating image deviation of a light combining prism.
The invention realizes the above purpose through the following technical scheme:
a color field correction method for eliminating image deviation of a light combining prism comprises the following steps:
s1, in 3-LCD projection, R light, G light and B light respectively form an R field, a G field and a B field carrying image information through a liquid crystal color separation panel, and the R field is overlapped to form an image under the action of a light combining prism, wherein the projection area of the R field is S R Generating a calibration line L R The projection area of the G field is S G Generating a calibration line L G The projection area of the B field is S B Generating a calibration line L B Projected area region S R 、S G 、S B The overlapping region forms an effective imaging display region S A The partial areas which are purely white, are not superimposed or in which two projected area areas are superimposed form a non-effectively presented display area S Z Is not pure white;
s2, moving the projection area S of the R field R Projection area S of G field G Projection area S of B field B So that the line L is calibrated R Calibration line L G Calibration line L B Overlapping at the center of the respective areas to increase the effective imaging displayIndication area S A If the initial overlapping error causes the display area S A If the area is acceptable, step S2 can be skipped to enter step S3;
s3, moving the calibration line L R Calibration line L G Calibration line L B In the effective imaging display area S A Left edge is overlapped to form a black calibration line L RGB The coordinates (x, y) of the calibration line at this time are recorded, and an effective imaging display area S is established A Coordinate system O of (2) SA (x, y) establishing a coordinate system O by a mapping function EA (x, y) that is, the pixel P (x 2, y 2) is mapped by P (x 1, y 1), R field, B field and G field repeat this calculation to complete the coordinate mapping of all pixels;
s4, coordinate system O SA The gray-scale value of a pixel P (x 2, y 2) on (x, y) is mapped on a coordinate system O EA The pixel P (x 1, y 1) on (x, y) is obtained, R field, B field and G field are repeated to complete the mapping of all pixel gray scale values, thus obtaining the effective imaging display area S A Is a video of the image of the object.
The present invention preferably generates a maximum gray-scale value for effectively imaging the display area S when performing color field correction according to step S1 A Is pure white, and the display area S is not effectively presented Z Is not pure white.
The present invention preferably provides the calibration line L according to step S1 R In the effective imaging display area S A Cyan is formed in the alignment line L G In the effective imaging display area S A In which magenta is formed, the calibration line L B In the effective imaging display area S A Yellow is formed in the line when the line is calibrated L R Calibration line L G Calibration line L B In the effective imaging display area S A Middle overlapping to form black calibration line L RGB 。
The present invention preferably provides for effective imaging of the display area S in accordance with step S3 A The upper left corner defines the coordinate as O SA (1, 1) which is to redefine the pixel coordinates at the start of the image pixel in the first column of the first row, and to move the calibration line L horizontally at the pixel level R Calibration line L G Calibration line L B To an effective imaging display areaDomain S A Is a left edge of a calibration line L R Calibration line L G Calibration line L B The overlapping distance error is less than 1 pixel, which is in the effective imaging display area S A Is overlapped to form a black calibration line L RGB Redefining the color field pixel coordinates is performed.
Preferably, according to step S3, a pixel coordinate P' (x, y) of R field, G field or B field of the image memory is set, x is row, y is column, and the coordinate O is defined EA (1, 1) starting at the image pixel of the first column of the first row for R field pixels, the coordinates are set at O SA The pixel P (x, y) on (x, y) is mapped to O by a mapping function F EA On (x, y) coordinates, i.e. S A The region is an imaging region.
In the present invention, preferably, the calculation formula of the mapping function F is:
wherein: x1 is the number of the mapping conversion bits after O EA Row coordinates on (x, y), x2 is the pixel to be mapped at O SA Row coordinates on (x, y), y1 is the mapped transformed value of O EA Column coordinates on (x, y), y2 is the pixel to be mapped at O SA Column coordinates on (x, y).
In the present invention, preferably, the calculation formula of the coordinate value of x1 is:
in the above formula, mapping of x coordinate, i.e. mapping in vertical direction, wherein x2 is the pixel to be mapped in O SA Row coordinates on (X, y), X is the total number of rows in the image resolution, X is the calibration line L at O EA Row coordinate values on (x, y), max (L R (x),(L G (x),(L B (x) A row coordinate maximum among the three calibration lines.
In the present invention, preferably, the calculation formula of the coordinate value of y1 is:
in the above formula, mapping of y coordinates of any row, namely mapping in the horizontal direction, wherein y2 is the pixel to be mapped in O SA Column coordinates on (x, Y), Y being the total number of columns in the image resolution, Y being the calibration line L R Calibration line L G Calibration line L B At O EA Column coordinate values on (x, y), max (L R (y),L G (y),L B (y)) is the column coordinate maximum value among the three calibration lines.
The present invention preferably provides that the coordinates are at O SA The pixel P (x 2, y 2) on (x, y) is subjected to a mapping function F to obtain a pixel P on O EA The (x, y) coordinate system positions (x 1, y 1), (x 1, y 1) are non-integers, and the gray scale value of the pixel P (x 2, y 2) is obtained by bilinear interpolation.
In the present invention, preferably, the calculation formula of the gray-scale value of the pixel P (x 2, y 2) is:
wherein P is S A The gray scale value of a pixel point on the area is (x 1, y 1) that the P point is mapped on O by the mapping function F EA Position on (x, y) coordinates xx 1 Values rounded down to x1, xx 2 Is a value rounded up to x1, yy 1 Y is a value rounded down to y1, yy 2 Is a value rounded up to y1, f (Q 11 )，f(Q 21 )，f(Q 12 )，f(Q 22 ) Is the gray scale value of the nearest four pixel points on the (x 1, y 1) position.
The invention has the beneficial effects that:
compared with the prior art, the color field correction method for eliminating the image deviation of the light combining prism can realize the correction of the image deviation without mechanical correction or under the condition that the image deviation cannot be well eliminated by mechanical correction, and the overlapping error is smaller than 1 pixel distance.
Drawings
The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain the invention. In the drawings:
fig. 1 is a schematic diagram of an RGB three liquid crystal display according to the background art of the present invention, which is emitted to the display through a light combining prism and then a lens.
FIG. 2 is a schematic illustration of the relationship of imaging regions according to the present invention;
FIG. 3 is a schematic diagram of the bilinear interpolation of the present invention;
fig. 4 is a flowchart of a color field correction method for eliminating image deviation of a light combining prism according to the present invention.
Detailed Description
The present invention will be described in further detail with reference to the drawings and examples, in order to make the objects, technical solutions and advantages of the present invention more apparent. It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the scope of the invention.
As shown in fig. 2-4, an embodiment of the present invention provides a color field correction method for eliminating image deviation of a light combining prism, which includes the following steps:
s1, in 3-LCD projection, R light, G light and B light respectively form an R field, a G field and a B field carrying image information through a liquid crystal color separation panel, and the R field is overlapped to form an image under the action of a light combining prism, wherein the projection area of the R field is S R Generating a calibration line L R The projection area of the G field is S G Generating a calibration line L G The projection area of the B field is S B Generating a calibration line L B Projected area region S R 、S G 、S B The overlapping region forms an effective imaging display region S A The partial areas which are purely white, are not superimposed or in which two projected area areas are superimposed form a non-effectively presented display area S Z Is not pure white;
s2, moving the projection area S of the R field R Projection area S of G field G Projection area S of B field B So that the line L is calibrated R Calibration line L G Calibration line L B Overlapping on the center of the respective areas to enlarge the effective imaging display area S A If the initial overlapping error causes the display area S A If the area is acceptable, step S2 can be skipped to enter step S3;
the calibration line L R In the effective imaging display area S A Cyan is formed in the alignment line L G In the effective imaging display area S A In which magenta is formed, the calibration line L B In the effective imaging display area S A Yellow is formed in the line when the line is calibrated L R Calibration line L G Calibration line L B In the effective imaging display area S A Middle overlapping to form black calibration line L RGB 。
S3, moving the calibration line L R Calibration line L G Calibration line L B In the effective imaging display area S A Left edge is overlapped to form a black calibration line L RGB The coordinates (x, y) of the calibration line at this time are recorded, and an effective imaging display area S is established A Coordinate system O of (2) SA (x, y) establishing a coordinate system O by a mapping function EA (x, y) that is, the pixel P (x 2, y 2) is mapped by P (x 1, y 1), R field, B field and G field repeat this calculation to complete the coordinate mapping of all pixels;
to effectively image the display area S A The upper left corner defines the coordinate as O SA (1, 1) which is to redefine the pixel coordinates at the start of the image pixel in the first column of the first row, and to move the calibration line L horizontally at the pixel level R Calibration line L G Calibration line L B To the effective imaging display area S A Is a left edge of a calibration line L R Calibration line L G Calibration line L B The overlapping distance error is less than 1 pixel, which is in the effective imaging display area S A Is overlapped to form a black calibration line L RGB Redefining the color field pixel coordinates is performed.
Let a pixel coordinate P' (x, y) of R field, G field or B field of image memory, x is row and y is column, define the coordinate O EA (1, 1) is R fieldThe pixel is at the image pixel starting point of the first row and the first column, and the coordinates are at O SA The pixel P (x, y) on (x, y) is mapped to O by a mapping function F EA On (x, y) coordinates, i.e. S A The region is an imaging region.
In the present invention, preferably, the calculation formula of the mapping function F is:
wherein: x1 is the number of the mapping conversion bits after O EA Row coordinates on (x, y), x2 is the pixel to be mapped at O SA Row coordinates on (x, y), y1 is the mapped transformed value of O EA Column coordinates on (x, y), y2 is the pixel to be mapped at O SA Column coordinates on (x, y).
In the present invention, preferably, the calculation formula of the coordinate value of x1 is:
in the above formula, mapping of x coordinate, i.e. mapping in vertical direction, wherein x2 is the pixel to be mapped in O SA Row coordinates on (X, y), X is the total number of rows in the image resolution, X is the calibration line L at O EA Row coordinate values on (x, y), max (L R (x),(L G (x),(L B (x) A row coordinate maximum among the three calibration lines.
In the present invention, preferably, the calculation formula of the coordinate value of y1 is:
in the above formula, mapping of y coordinates of any row, namely mapping in the horizontal direction, wherein y2 is the pixel to be mapped in O SA Column coordinates on (x, Y), Y being the total number of columns in the image resolution, Y being the calibration line L R Calibration line L G Calibration line L B At O EA Column coordinate values on (x, y), max (L R (y),L G (y),L B (y)) is the column coordinate maximum value among the three calibration lines.
The present invention preferably provides that the coordinates are at O SA The pixel P (x 2, y 2) on (x, y) is subjected to a mapping function F to obtain a pixel P on O EA The (x, y) coordinate system positions (x 1, y 1), (x 1, y 1) are non-integers, and the gray scale value of the pixel P (x 2, y 2) is obtained by bilinear interpolation.
In the present invention, preferably, the calculation formula of the gray-scale value of the pixel P (x 2, y 2) is:
wherein P is S A The gray scale value of a pixel point on the area is (x 1, y 1) that the P point is mapped on O by the mapping function F EA Position on (x, y) coordinates xx 1 Values rounded down to x1, xx 2 Is a value rounded up to x1, yy 1 Y is a value rounded down to y1, yy 2 Is a value rounded up to y1, f (Q 11 )，f(Q 21 )，f(Q 12 )，f(Q 22 ) Is the gray scale value of the nearest four pixel points on the (x 1, y 1) position.
S4, coordinate system O SA The gray-scale value of a pixel P (x 2, y 2) on (x, y) is mapped on a coordinate system O EA The pixel P (x 1, y 1) on (x, y) is obtained, R field, B field and G field are repeated to complete the mapping of all pixel gray scale values, thus obtaining the effective imaging display area S A Is a video of the image of the object.
The working principle of the invention is as follows:
as shown in fig. 2-4, in the 3-LCD projection system, R light, G light, and B light respectively pass through the liquid crystal color separation panel to form R field, G field, B field, and three fields that carry image information, which are overlapped under the action of the light-converging prism to form an image, and on the same plane where the three fields are overlapped and projected, because of the error of the hardware structure, the error of the hardware structure is not necessarily completely overlapped, and image deviation is caused, that is, the projection area S of the R field is formed R Projected area region S of G field G Projection area S of B field B . Projection areaS R Projection area S G Projection area S B The three have horizontal and vertical combined translation errors, and the overlapped area of the three is the effective imaging display area S A The non-superimposed or two-field superimposed partial region due to the combined translational error is the non-effective presentation display region S Z 。
In the process of color field correction, R field, G field and B field with maximum gray scale value are generated, S A Is pure white in color, S Z Is non-white. S formed in R field R In the region, an R field calibration line L is generated R The gray level value is 0, then at S A Region L R A cyan color will be formed. Similarly, the other two fields generate the calibration line L G And L B In S A The areas will form magenta and yellow. If the calibration line L R ，L G ，L B At S A The overlapping of the areas forms a black calibration line L RGB . S can be achieved by conventional mechanical calibration R ，S G ，S B Horizontal and vertical translation of the region to expect S A Maximum area, S Z Minimum area, calibration line L R ，L G ，L B The pixel level distance can be shifted and the redefined color field pixel coordinates are used to achieve color field correction.
First, S is reduced as much as possible Z Increase S A The object is to ensure the largest imaging area as possible after the color field correction is achieved using redefined color field pixel coordinates, which step is optional during practical application and if removed, the redefined color field pixel coordinates can also be used to achieve the color field correction. If retained, then S can be translated by mechanically correcting R ，S G ，S B The ideal overlapping position is the calibration line L generated at the midpoint R ，L G ，L B At S A The areas overlap to form a black calibration line L RGB The actual situation is that the superposition is not good, or because the precision of mechanical adjustment is far greater than the distance between pixels, the superposition is difficult to adjust, so that the imaging deviation is larger or smaller, or is unacceptable.
Second step, find S A The upper left corner of the region defines the coordinate as O SA (1, 1) is an image pixel start point with redefined pixel coordinates at row 1 and column 1. The searching method comprises the following steps: because of S A Pure white, S Z For non-white areas, the color difference between the two areas is obvious, and the L can be horizontally moved R To S A Is provided. Also L G ，L B Can also move to S A Is provided. Due to the calibration line L R ，L G ，L B Is a pixel level shift, and the three overlap distance errors are smaller than 1 pixel, so that the method is easy to be carried out in S A Is overlapped to form a black calibration line L RGB After finding, the alignment can be confirmed by an interactive button to redefine the color field pixel coordinates.
Third, assuming the image memory R field, a pixel coordinate P' (x, y), x being the row and y being the column, the coordinate O is defined EA (1, 1) is the image pixel starting point of the R field pixel at row 1 and column 1. Coordinate at O SA The pixel P (x, y) on (x, y) is mapped to O by a mapping function F EA (x, y) coordinates. The same G field and B field are processed in the same way, so S A The region becomes the actual imaging region and color field correction at the pixel error level is achieved. The calculation formula of the mapping function F is as follows:
wherein: x1 is the number of the mapping conversion bits after O EA Row coordinates on (x, y), x2 is the pixel to be mapped at O SA Row coordinates on (x, y), y1 is the mapped transformed value of O EA Column coordinates on (x, y), y2 is the pixel to be mapped at O SA Column coordinates on (x, y).
The calculation formula of the coordinate value of x1 is as follows:
in any one of the above columns, the x coordinateI.e. mapping in the vertical direction, where x2 is the pixel to be mapped at O SA Row coordinates on (X, y), X is the total number of rows in the image resolution, X is the calibration line L at O EA Row coordinate values on (x, y), max (L R (x),(L G (x),(L B (x) A row coordinate maximum among the three calibration lines.
The calculation formula of the coordinate value of y1 is as follows:
in the above formula, mapping of y coordinates of any row, namely mapping in the horizontal direction, wherein y2 is the pixel to be mapped in O SA Column coordinates on (x, Y), Y being the total number of columns in the image resolution, Y being the calibration line L R Calibration line L G Calibration line L B At O EA Column coordinate values on (x, y), max (L R (y),L G (y),L B (y)) is the column coordinate maximum value among the three calibration lines.
The coordinates are at O SA The pixel P (x 2, y 2) on (x, y) is subjected to a mapping function F to obtain a pixel P on O EA The (x, y) coordinate system position (x 1, y 1), wherein (x 1, y 1) is a non-integer, and the gray scale value of the pixel P (x 2, y 2) is obtained through bilinear interpolation, and the calculation formula of the gray scale value of the pixel P (x 2, y 2) is as follows:
wherein P is S A The gray scale value of a pixel point on the area is (x 1, y 1) that the P point is mapped on O by the mapping function F EA Position on (x, y) coordinates xx 1 Values rounded down to x1, xx 2 Is a value rounded up to x1, yy 1 Y is a value rounded down to y1, yy 2 Is a value rounded up to y1, f (Q 11 )，f(Q 21 )，f(Q 12 )，f(Q 22 ) Is the gray scale value of the nearest four pixel points on the (x 1, y 1) position.
In summary, the present invention provides a color field correction method for eliminating image deviation of a light combining prism, which can realize correction of image deviation without mechanical correction or without mechanical correction, and the overlapping error is less than 1 pixel distance.
It should be noted that, in this document, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, article, or apparatus. Without further limitation, an element defined by the phrase "comprising one … …" does not exclude the presence of other like elements in a process, article or apparatus that comprises the element.
The foregoing description is only of the preferred embodiments of the present invention, and is not intended to limit the scope of the present invention.
Claims (10)
1. A color field correction method for eliminating image deviation of a light combining prism is characterized by comprising the following steps:
s1, in 3-LCD projection, R light, G light and B light respectively form an R field, a G field and a B field carrying image information through a liquid crystal color separation panel, and the R field is overlapped to form an image under the action of a light combining prism, wherein the projection area of the R field is S R Generating a calibration line L R The projection area of the G field is S G Generating a calibration line L G The projection area of the B field is S B Generating a calibration line L B Projected area region S R 、S G 、S B The overlapping region forms an effective imaging display region S A The partial areas which are purely white, are not superimposed or in which two projected area areas are superimposed form a non-effectively presented display area S Z Is not pure white;
s2, moving the projection area S of the R field R Projection area S of G field G Projection area S of B field B So that the line L is calibrated R Calibration line L G Calibration line L B In the respective areasTo increase the effective imaging display area S A If the initial overlapping error causes the display area S A If the area is acceptable, step S2 can be skipped to enter step S3;
s3, moving the calibration line L R Calibration line L G Calibration line L B In the effective imaging display area S A Left edge is overlapped to form a black calibration line L RGB The coordinates (x, y) of the calibration line at this time are recorded, and an effective imaging display area S is established A Coordinate system O of (2) SA (x, y) establishing a coordinate system O by a mapping function EA (x, y) that is, the pixel P (x 2, y 2) is mapped by P (x 1, y 1), R field, B field and G field repeat this calculation to complete the coordinate mapping of all pixels;
s4, coordinate system O SA The gray-scale value of a pixel P (x 2, y 2) on (x, y) is mapped on a coordinate system O EA The pixel P (x 1, y 1) on (x, y) is obtained, R field, B field and G field are repeated to complete the mapping of all pixel gray scale values, thus obtaining the effective imaging display area S A Is a video of the image of the object.
2. The method of claim 1, wherein in step S1, a maximum gray scale value is generated during the color field correction, and the display area S is effectively imaged A Is pure white, and the display area S is not effectively presented Z Is not pure white.
3. The color field correction method for eliminating image deviation of light combining prism as defined in claim 1 or 2, wherein according to step S1, the calibration line L R In the effective imaging display area S A Cyan is formed in the alignment line L G In the effective imaging display area S A In which magenta is formed, the calibration line L B In the effective imaging display area S A Yellow is formed in the line when the line is calibrated L R Calibration line L G Calibration line L B In the effective imaging display area S A Middle overlapping to form black calibration line L RGB 。
4. The method of claim 3, wherein the step S3 is performed to effectively image the display area S A The upper left corner defines the coordinate as O SA (1, 1) which is to redefine the pixel coordinates at the start of the image pixel in the first column of the first row, and to move the calibration line L horizontally at the pixel level R Calibration line L G Calibration line L B To the effective imaging display area S A Is a left edge of a calibration line L R Calibration line L G Calibration line L B The overlapping distance error is less than 1 pixel, which is in the effective imaging display area S A Is overlapped to form a black calibration line L RGB Redefining the color field pixel coordinates is performed.
5. The method of claim 4, wherein in step S3, a pixel coordinate P' (x, y) of R field, G field or B field of the image memory is set, x is row, y is column, and the coordinate O is defined EA (1, 1) starting at the image pixel of the first column of the first row for R field pixels, the coordinates are set at O SA The pixel P (x, y) on (x, y) is mapped to O by a mapping function F EA On (x, y) coordinates, i.e. S A The region is an imaging region.
6. The method for color field correction for eliminating image deviation of light combining prism as defined in claim 5, wherein the calculation formula of the mapping function F is:
wherein: x1 is the number of the mapping conversion bits after O EA Row coordinates on (x, y), x2 is the pixel to be mapped at O SA Row coordinates on (x, y), y1 is the mapped transformed value of O EA Column coordinates on (x, y), y2 is the pixel to be mapped at O SA Column coordinates on (x, y).
7. The method for color field correction for eliminating image deviation of light combining prism according to claim 6, wherein the formula of the coordinate value of x1 is:
in the above formula, mapping of x coordinate, i.e. mapping in vertical direction, wherein x2 is the pixel to be mapped in O SA Row coordinates on (X, y), X is the total number of rows in the image resolution, X is the calibration line L at O EA Row coordinate values on (x, y), max (L R (x),(L G (x),(L B (x) A row coordinate maximum among the three calibration lines.
8. The method for color field correction for eliminating image deviation of light combining prism according to claim 7, wherein the calculation formula of the coordinate value of y1 is:
in the above formula, mapping of y coordinates of any row, namely mapping in the horizontal direction, wherein y2 is the pixel to be mapped in O SA Column coordinates on (x, Y), Y being the total number of columns in the image resolution, Y being the calibration line L R Calibration line L G Calibration line L B At O EA Column coordinate values on (x, y), max (L R (y),L G (y),L B (y)) is the column coordinate maximum value among the three calibration lines.
9. The method of claim 8, wherein the coordinates are at O SA The pixel P (x 2, y 2) on (x, y) is subjected to a mapping function F to obtain a pixel P on O EA The (x, y) coordinate system position (x 1, y 1), (x 1, y 1) is a non-integer, and the pixel P (x 2, y 2) is obtained by bilinear interpolation) Is a gray scale value of (a).
10. The method for color field correction for eliminating image deviation of light combining prism as defined in claim 9, wherein the gray scale value of the pixel P (x 2, y 2) is calculated as:
wherein P is S A The gray scale value of a pixel point on the area is (x 1, y 1) that the P point is mapped on O by the mapping function F EA Position on (x, y) coordinates xx 1 Values rounded down to x1, xx 2 Is a value rounded up to x1, yy 1 Y is a value rounded down to y1, yy 2 Is a value rounded up to y1, f (Q 11 )，f(Q 21 )，f(Q 12 )，f(Q 22 ) Is the gray scale value of the nearest four pixel points on the (x 1, y 1) position.
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