CN109819225A - Color temperature correction method, color temperature correction device and the projection TV of projection TV - Google Patents
Color temperature correction method, color temperature correction device and the projection TV of projection TV Download PDFInfo
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- CN109819225A CN109819225A CN201711165753.8A CN201711165753A CN109819225A CN 109819225 A CN109819225 A CN 109819225A CN 201711165753 A CN201711165753 A CN 201711165753A CN 109819225 A CN109819225 A CN 109819225A
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Abstract
The present invention is suitable for projection art, provides a kind of color temperature correction method of projection TV, and the sampled images including exporting to collected projection TV are handled, and obtains the luminance information of R, G, B three primary colours light；The adjustment data of R, G, B three primary colours light are calculated according to the luminance information of R, G, B three primary colours light；The light source output of projection TV is corrected according to adjustment data, adjusts the brightness of R, G, B three primary colours light to meet white balance requirement.This method passes through acquisition image, obtain three primary colours brightness data, in conjunction with desired brightness and acquisition brightness data, calculate the adjustment data of three primary colours light, by in the light source output correction of the adjustment data application to projection TV, the brightness of three primary colours light is adjusted to reach desired brightness, and then maintain color temperature constant, it solves the problems, such as that with the extension for using the time color temperature change occurs for projection TV, ensure that preferably stable drop shadow effect.
Description
Technical field
The invention belongs to projection art, in particular to the color temperature correction method of a kind of projection TV, color temperature correction dress
It sets and projection TV.
Background technique
With the development of photoelectric technology, the update of projection products is getting faster, after light bulb projection, LED light source
Projection and laser light source projection are more more and more universal, have been increasingly becoming engineering machine, individual consumer's goods, main force's type of household supplies.
Light bulb projection there are problems that frequently more changing the bulb because the life cycle of light bulb is relatively short.And LED light source and laser light source
Projector because the service life of LED light source and laser light source is relatively long, theoretically can achieve 20000 hours or more, so,
LED light source and laser light source can usually be used with projection device complete machine all one's life.
But although LED light source and laser light source last a long time, in the Life Cycle of LED light source and laser light source
In phase, what the brightness of light source still slowly changed, brightness is lower and lower, and under normal circumstances, using 5000 hours, brightness was reduced
To 90%, using 10000 hours, brightness was reduced to 80%, and using 20000 hours, brightness was reduced to 60%.In the variation of brightness
On, the variation of RGB three primary colours be not it is completely the same, therefore, with the reduction of brightness, the colour temperature of complete machine can also change,
Cause white balance to deviate, eventually affects picture viewing effect.
Projection machine on the market is not yet handled color temperature change at present, the color temperature shift of product in use
Problem has to be solved.
Summary of the invention
The purpose of the present invention is to provide a kind of color temperature correction methods of projection TV, it is intended to solve conventional projection television with
The technical issues of color temperature change occurs using the extension of time.
The invention is realized in this way the color temperature correction method of projection TV, which is characterized in that include the following steps:
S1, the sampled images of collected projection TV output are handled, obtains the brightness letter of R, G, B three primary colours light
Breath；
S2, the adjustment data that R, G, B three primary colours light are calculated according to the luminance information of R, G, B three primary colours light；
S3, the light source output of the projection TV is corrected according to the adjustment data, adjusts tri- base of R, G, B
The brightness of coloured light is to meet white balance requirement.
Further, the sampled images of the projection TV output are R, G, B three primary colours square, wherein R color square, G color
Square is identical with the shapes and sizes of B color square and is equidistantly displayed side by side in the display area of projection TV center.
Further, the size of the R color square, G color square and B color square is 150-250 pixel.
Further, the step S2 specifically:
Calculate separately the ratio of R coloured light, the brightness of G coloured light and B coloured light and respective original brightness；
Using the smallest monochromatic light of the ratio as invariant, other two kinds monochromatic brightness adjustment amplitudes are determined respectively,
Obtain the adjustment data.
Further, after the step S3 further include:
S4, acquisition it is corrected after image and handled, obtain R, G, B three primary colours light luminance information；
Within a preset range whether S5, the brightness for judging R, G, B three primary colours light, are to terminate；Otherwise it carries out next
Step；
S6, the adjustment data again for calculating R, G, B three primary colours light；
S7, the light source output of the projection TV is corrected again according to the data of adjustment again, described in adjustment
R, the brightness of G, B three primary colours light is to meet white balance requirement.
Further, after the step S3 further include:
S4 ', acquisition it is corrected after image and handled, obtain R, G, B three primary colours light luminance information；
Within a preset range whether S5 ', the brightness for judging R, G, B three primary colours light, are to terminate；Otherwise return step
S2。
Further, the adjustment data include electric current adjustment amount, and every kind of monochromatic light to be adjusted respectively corresponds an electric current
Adjustment amount；
For any monochromatic light to be adjusted, during n-th correction, N is the positive integer greater than 1, n-th school
Adjustment amount/practical adjustment amount of preceding (N-1) secondary brightness, institute it is expected in positive electric current adjustment amount=preceding (N-1) primary current adjustment amount * brightness
Stating brightness expectation adjustment amount is invariant.
Another object of the present invention is to provide a kind of color temperature correction devices of projection TV, comprising:
Image output module, for exporting sampled images；
Sampling processing module is handled the sampled images for acquiring the sampled images, obtains R, G, B tri-
The luminance information of primary lights；
Computing module, for calculating the adjustment number of R, G, B three primary colours light according to the luminance information of R, G, B three primary colours light
According to；
Correction module adjusts institute for being corrected according to the adjustment data to the light source output of the projection TV
The brightness of R, G, B three primary colours light is stated to meet white balance requirement.
Further, described image output module be also used to will be corrected after image output；
The sampling processing module be also used to acquire it is described it is corrected after image and handled, obtain R, G, B tri-
The luminance information of primary lights；
The color temperature correction device further include:
Within a preset range whether judgment module, the brightness for judging R, G, B three primary colours light, are to terminate；It is no
The adjustment data of R, G, B three primary colours light are then calculated according to the luminance information of R, G, B three primary colours light again by computing module.
Another object of the present invention is to provide a kind of projection TV, including memory, processor and it is stored in described
In memory and the computer program that can run on the processor, the processor are realized when executing the computer program
Such as the step of above-mentioned any color temperature correction method.
The color temperature correction method of projection TV provided in an embodiment of the present invention has the following beneficial effects: this method by adopting
Collect sampled images, the brightness data of R, G, B three primary colours is obtained, in conjunction with the brightness number of desired R, G, B three primary colours brightness and acquisition
According to the adjustment data of calculating R, G, B three primary colours light are adjusted in the light source output correction of the adjustment data application to projection TV
The brightness of whole R, G, B three primary colours light makes three primary colours brightness ratio meet white balance requirement, dimension to reach desired brightness
Color temperature constant is held, solves the problems, such as that with the extension for using the time color temperature change occurs for projection TV, ensure that preferably steady
Fixed drop shadow effect.
Detailed description of the invention
Fig. 1 is the flow chart of the color temperature correction method for the projection TV that first embodiment of the invention provides；
Fig. 2 is the flow chart of the color temperature correction method for the projection TV that second embodiment of the invention provides；
Fig. 3 is the flow chart of the color temperature correction method for the projection TV that third embodiment of the invention provides.
Specific embodiment
In order to make the objectives, technical solutions, and advantages of the present invention clearer, with reference to the accompanying drawings and embodiments, right
The present invention is further elaborated.It should be appreciated that described herein, specific examples are only used to explain the present invention, not
For limiting the present invention.
In order to illustrate technical solution described in the embodiment of the present invention, carried out specifically below in conjunction with specific accompanying drawings and embodiments
It is bright.
Embodiment one:
Referring to Fig. 1, first embodiment of the invention provides a kind of color temperature correction method of projection TV, including following steps
It is rapid:
S1, the sampled images of collected projection TV output are handled, obtains the brightness letter of R, G, B three primary colours light
Breath；
S2, the adjustment data that R, G, B three primary colours light are calculated according to the luminance information of R, G, B three primary colours light；
S3, according to adjustment data the light source output of projection TV is corrected, adjust R, G, B three primary colours light brightness with
Meet white balance requirement.
In above-mentioned color temperature correction method, the sampled images in step S1 are pre-stored in projection TV, pass through broadcasting
The mode of projected image projects sampled images on display plane.Sampled images can be shot using video camera in step S1,
To obtain the luminance information of R, G, B three primary colours light, then by the data transmission comprising three primary colours luminance information of sampled images to phase
It answers in means for correcting, which is preferably the camera on projection TV, it can be the included camera of projection TV, or
It is the camera being separately installed on projection TV, corresponding means for correcting is set in projection TV, connect with video camera, can be into
Row data transmission.
In above-mentioned steps S2, R, G, B are calculated according to the luminance information of R, G, B three primary colours light in the image of step S1 acquisition
The adjustment data of three primary colours light.The adjustment data finally apply in the Light source correction of projection TV.Specifically, step S2 can be with
Include the following steps:
The first step calculates separately the ratio of R coloured light, the brightness of G coloured light and B coloured light and respective original brightness.
Second step determines other two kinds monochromatic brightness adjustment width using the smallest monochromatic light of ratio as invariant respectively
Degree obtains adjustment data.
Above-mentioned original brightness is brightness when projection TV dispatches from the factory, it may be assumed that the original brightness of R coloured light, G coloured light and B coloured light
When respectively projection TV dispatches from the factory, R coloured light, G coloured light and B coloured light are measured at full width fan-out capability (under maximum Safety output electric current)
Brightness.The Computing Principle of above-mentioned adjustment data is as follows: assuming that the R coloured light, G coloured light and the B that test in projection TV factory
The original brightness of coloured light is denoted as respectively: LR0, LG0, LB0, R coloured light, G coloured light and the B coloured light handled sampled images
Brightness be denoted as respectively: LRX, LGX, LBX, R coloured light, the brightness of G coloured light and B coloured light and respective original brightness ratio difference
Are as follows: LRX/LR0, LGX/LG0, LBX/LB0.According to optical theory it is recognised that if setting target colour temperature, white to what is obtained
Light effect light emission luminance is 100%, then the brightness ratio of R, G, B three primary colours light is fixed.Because the R of above-mentioned test value,
G, B three primary colours brightness value is the brightness measured in full width fan-out capability (under maximum Safety output electric current), therefore, when correcting colour temperature
The holding for obtaining colour temperature needs coloured light (LRX/LR0, LGX/LG0, LBX/ that brightness ratio in R, G, B three primary colours is minimum
The smallest monochromatic light in LB0) it remains unchanged, by other two kinds of primary colours range of decrease outputs, the ratio of three kinds of primary colours is made to meet original ratio
Example maintains color temperature constant.
After adjustment data are calculated, by the data application to light source.Step S3 is carried out, according to adjustment data to throwing
The light source output of shadow TV is corrected, and adjusts the brightness of R, G, B three primary colours light to meet white balance requirement.It specifically, can be with
The brightness output of reference light source and the relation curve of driving circuit determine the curent change of the control circuit of other two kinds of primary colours
Value, which is applied in the adjustment of two kinds of coloured light respectively, is adjusted separately to two kinds of coloured light, so that tri- base of R, G, B
The brightness ratio of color is restored to reset condition, i.e. completion color temperature correction.
The color temperature correction method of projection TV provided in an embodiment of the present invention obtains R, G, B tri- by acquiring sampled images
The brightness data of primary colours calculates R, G, B three primary colours light in conjunction with the brightness data of the desired brightness of R, G, B three primary colours and acquisition
Adjust data, will the adjustment data application to projection TV light source output correction in, adjust R, G, B three primary colours light brightness with
Desired brightness is reached, and then three primary colours brightness ratio is made to meet white balance requirement, maintains color temperature constant, solves projection electricity
The problem of depending on color temperature change occurs with the extension for using the time, it ensure that preferably stable drop shadow effect.
Preferably, for the ease of sample and reduce sampled images introducing correction error, the present embodiment selection sample graph
As being R, G, B three primary colours square, wherein R color square, G color square are identical with the shapes and sizes of B color square and equidistantly show side by side
It is shown in the display area center of projection TV, that is, is shown in the middle position of above-mentioned display plane.Viewing area can be evaded in this way
Edge brightness non-uniform problem in domain avoids the brightness of sampled images that from cannot really reacting the color of projection TV, leads to school
Positive error.
Further, the size of R color square, G color square and B color square should not be too large, and crosses conference and introduces optical brightness not
Uniform problem, also should not be too small, too small to introduce calculating error.Size is 150-250 pixel, is preferably choosing with 200 pixels
It selects.
Embodiment two:
Referring to Fig. 2, second embodiment of the invention provides a kind of color temperature correction method of projection TV, this method is being implemented
Further progress double sampling and correction on the basis of example one cannot be met the requirements with solving the calibration result that primary correction occurs
The problem of.Specifically, this method includes the following steps:
S1, the sampled images of collected projection TV output are handled, obtains the brightness letter of R, G, B three primary colours light
Breath；
S2, the adjustment data that R, G, B three primary colours light are calculated according to the luminance information of R, G, B three primary colours light；
S3, according to adjustment data the light source output of projection TV is corrected, adjust R, G, B three primary colours light brightness with
Meet white balance requirement；
S4, acquisition it is corrected after image and handled, obtain R, G, B three primary colours light luminance information；
Within a preset range whether S5, the brightness for judging R, G, B three primary colours light, are to terminate；Otherwise it carries out in next step；
S6, the adjustment data again for calculating R, G, B three primary colours light；
S7, data are adjusted again according to this light source output of projection TV is corrected again, adjust R, G, B three primary colours
The brightness of light is to meet white balance requirement.
Step S1 to step S3 completes a color temperature correction of projection TV, in order to keep the effect of color temperature correction closer
It is expected that colour temperature, which carries out double sampling and correction, and the purpose of secondary correction essentially consists in primary colours control compensation, because
For light source individual difference and aging at any time, the control electric current of light source is caused also to drift about with light output curve itself, therefore,
Based on the result that original light source control electric current and light output curve obtain, there may be micro offsets for primary correction, and then pass through
Secondary correction is further compensate for the offset.
In above-mentioned steps S4, exported the image once corrected as the sampled images of secondary correction, it is false by calculating
If the brightness after primary correction is denoted as LRY, LGY, LBY respectively, LRY/LR0, LGY/LG0, LBY/LB0 are calculated, it is assumed that the ratio
Error with original ratio then completes color temperature correction within 0.1%, if more than 0.1%, then carries out secondary correction.
The adjustment data again of secondary correction determine have according to the adjustment data once corrected and the result once corrected
Body, the adjustment data once corrected include at least primary current adjustment amount, the primary current adjustment amount and monochrome to be adjusted
Light correspond, again adjust data include at least secondary current adjustment amount, the secondary current adjustment amount equally with it is to be adjusted
Monochromatic light corresponds, for any monochromatic light to be adjusted, secondary current adjustment amount=primary current adjustment amount * brightness phase
Hope the practical adjustment amount of an adjustment amount/time brightness, wherein primary current adjustment amount is to determine in step s 2, brightness expectation adjustment
Amount is pre-set value, and a practical adjustment amount of brightness is primary correction latter two primary colours brightness adjustment amount adjusted.By two
After secondary correction, the brightness ratio of R, G, B three primary colours can usually revert to original scale.
Embodiment three:
Referring to Fig. 3, third embodiment of the invention provides a kind of color temperature correction method of projection TV, this method is being implemented
Further progress recyclable sampling and correction on the basis of example one, to reach preferable calibration result.Specifically, this method packet
Include following step:
S1, the sampled images of collected projection TV output are handled, obtains the brightness letter of R, G, B three primary colours light
Breath；
S2, the adjustment data that R, G, B three primary colours light are calculated according to the luminance information of R, G, B three primary colours light；
S3, according to adjustment data the light source output of projection TV is corrected, adjust R, G, B three primary colours light brightness with
Meet white balance requirement；
S4 ', acquisition it is corrected after image and handled, obtain R, G, B three primary colours light luminance information；
Within a preset range whether S5 ', the brightness for judging R, G, B three primary colours light, are to terminate；Otherwise return step S2.
Above-mentioned steps S1 to S3, which completes a color temperature correction, will once correct result conduct to preferably correct colour temperature
The sampled images output corrected again, and the luminance information for obtaining R, G, B three primary colours light is calculated, judge R, G, B three primary colours light
Within a preset range whether brightness, be to terminate, can be according to current correction image as the result is shown；Otherwise return step S2, after
The continuous verifying for being corrected and correcting result according to the reiteration of S2 to S5 ', until the brightness of R, G, B three primary colours light is pre-
If in range, completing color temperature correction.
The bearing calibration provided through this embodiment carries out color temperature correction, can more be connect by repeatedly correcting to reach repeatedly
The effect of colour temperature is hoped in the recent period.
It is appreciated that during n-th correction, N is just whole greater than 1 for any monochromatic light to be adjusted
Electric current adjustment amount=secondary brightness of preceding (N-1) primary current adjustment amount * brightness expectation adjustment amount/preceding (N-1) of number, n-th correction is real
Border adjustment amount, the brightness it is expected that adjustment amount is invariant.The electric current adjustment amount of n-th correction is the electric current in n times correction course
Total adjustment amount, preceding (N-1) primary current adjustment amount are the total regulated quantity of electric current in (N-1) secondary correction course, and adjustment amount it is expected in brightness
It is still invariant, the difference or associated therewith of brightness before not adjusting for original brightness and.
Example IV:
Fourth embodiment of the invention provides a kind of color temperature correction device of projection TV, is at least used to implement above-mentioned implementation
Method described in example one, the color temperature correction device specifically include:
Image output module, for exporting sampled images；
Sampling processing module is handled sampled images for acquiring sampled images, obtains R, G, B three primary colours light
Luminance information；
Computing module, for calculating the adjustment data of R, G, B three primary colours light according to the luminance information of R, G, B three primary colours light；
Correction module adjusts R, G, B tri- for being corrected according to adjustment data to the light source output of the projection TV
The brightness of primary lights is to meet white balance requirement.
Further, when needing secondary correction, the image output module be also used to will be corrected after image output；
Sampling processing module be also used to acquire it is corrected after image and handled, obtain R, G, B three primary colours light luminance information.
On this basis, which further includes judgment module, for judging that the brightness of R, G, B three primary colours light is
No is within a preset range to terminate, and completes color temperature correction；Otherwise again by computing module according to R, G, B three primary colours light
Luminance information calculates the adjustment data of R, G, B three primary colours light, and carries out secondary correction by correction module.
It further, will be after secondary correction again by image output module when needing progress timing three times
Image output；The image after secondary correction is acquired by sampling processing module and is handled, and R, G, B three primary colours light are obtained
Luminance information, by computing module according to the luminance information of R, G, B three primary colours light calculate R, G, B three primary colours light adjustment number
According to, and corrected three times by correction module, it carries out repeatedly, until judging that the brightness of R, G, B three primary colours light is pre-
If in range, terminating color temperature correction.
Color temperature correction method based on above-mentioned projection TV, the embodiment of the present invention also provides a kind of projection TV, including deposits
Reservoir, processor and storage in the memory and the computer program that can run on the processor, the processor
The step of color temperature correction method such as any embodiment of the present invention offer is realized when executing computer program.
The foregoing is merely illustrative of the preferred embodiments of the present invention, is not intended to limit the invention, all in essence of the invention
Made any modifications, equivalent replacements, and improvements etc., should all be included in the protection scope of the present invention within mind and principle.
Claims (10)
1. the color temperature correction method of projection TV, which is characterized in that include the following steps:
S1, the sampled images of collected projection TV output are handled, obtains the luminance information of R, G, B three primary colours light；
S2, the adjustment data that R, G, B three primary colours light are calculated according to the luminance information of R, G, B three primary colours light；
S3, the light source output of the projection TV is corrected according to the adjustment data, adjusts R, G, B three primary colours light
Brightness with meet white balance requirement.
2. the color temperature correction method of projection TV as described in claim 1, which is characterized in that the projection TV output is adopted
Sampled images are R, G, B three primary colours square, wherein R color square, G color square it is identical with the shapes and sizes of B color square and it is equidistant simultaneously
Row is shown in the display area center of the projection TV.
3. the color temperature correction method of projection TV as claimed in claim 2, which is characterized in that the R color square, G color square
Size with B color square is 150-250 pixel.
4. the color temperature correction method of projection TV as described in claim 1, which is characterized in that the step S2 specifically:
Calculate separately the ratio of R coloured light, the brightness of G coloured light and B coloured light and respective original brightness；
Using the smallest monochromatic light of the ratio as invariant, other two kinds monochromatic brightness adjustment amplitudes are determined respectively, are obtained
The adjustment data.
5. such as the color temperature correction method of the described in any item projection TVs of Claims 1-4, which is characterized in that in the step
After S3 further include:
S4, acquisition it is corrected after image and handled, obtain R, G, B three primary colours light luminance information；
Within a preset range whether S5, the brightness for judging R, G, B three primary colours light, are to terminate；Otherwise it carries out in next step:
S6, the adjustment data again for calculating R, G, B three primary colours light；
S7, the light source output of the projection TV is corrected according to the data of adjustment again again, adjusts described R, G, B
The brightness of three primary colours light is to meet white balance requirement.
6. such as the color temperature correction method of the described in any item projection TVs of Claims 1-4, which is characterized in that in the step
After S3 further include:
S4 ', acquisition it is corrected after image and handled, obtain R, G, B three primary colours light luminance information；
Within a preset range whether S5 ', the brightness for judging R, G, B three primary colours light, are to terminate；Otherwise return step S2.
7. such as the color temperature correction method of projection TV described in claim 5 or 6, which is characterized in that the adjustment data include
Electric current adjustment amount, every kind of monochromatic light to be adjusted respectively correspond an electric current adjustment amount；
For any monochromatic light to be adjusted, during n-th correction, N is the positive integer greater than 1, n-th correction
Adjustment amount/practical adjustment amount of preceding (N-1) secondary brightness it is expected in the adjustment amount * brightness of electric current adjustment amount=preceding (N-1) primary current, described bright
Degree expectation adjustment amount is invariant.
8. the color temperature correction device of projection TV characterized by comprising
Image output module, for exporting sampled images；
Sampling processing module is handled the sampled images for acquiring the sampled images, obtains R, G, B three primary colours
The luminance information of light；
Computing module, for calculating the adjustment data of R, G, B three primary colours light according to the luminance information of R, G, B three primary colours light；
Correction module, for being corrected according to the adjustment data to the light source output of the projection TV, adjust the R,
G, the brightness of B three primary colours light is to meet white balance requirement.
9. the color temperature correction device of projection TV as claimed in claim 8, which is characterized in that described image output module is also used
Image output after will be corrected；
The sampling processing module be also used to acquire it is described it is corrected after image and handled, obtain R, G, B three primary colours
The luminance information of light；
The color temperature correction device further include:
Within a preset range whether judgment module, the brightness for judging R, G, B three primary colours light, are to terminate；Otherwise again
The secondary adjustment data for calculating R, G, B three primary colours light according to the luminance information of R, G, B three primary colours light by computing module.
10. projection TV, which is characterized in that in the memory and can be described including memory, processor and storage
The computer program run on processor, which is characterized in that the processor realizes such as right when executing the computer program
It is required that the step of any one of 1 to 7 color temperature correction method.
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Cited By (1)
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Application publication date: 20190528 |
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