JP3556742B2 - Video camera equipment - Google Patents

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a video camera device, which is devised so that when a film image of a negative film is shot, a good film image can be shot without requiring an operation by a user.
[0002]
[Prior art]
2. Description of the Related Art An image (film image) captured on a film (silver film) processed by an optical camera and developed is photographed by a video camera. In this way, an optical image can be converted into a video signal, and this video signal can be recorded on a video tape, or the video signal can be sent to a television system and displayed as a television image.
[0003]
In order to capture a film image, a film adapter 2 is attached to a lens portion of the video camera 1 as shown in FIG. The film adapter 2 has a built-in lighting device and a film carrier 3 with a film 4 interposed therebetween. Then, the video camera 1 performs video shooting of a film image of one frame of the film 4.
[0004]
When a negative film is video-recorded, a negative-positive reversing process for electrically converting a negative image into a positive image by a negative-positive reversing circuit of the video camera must be performed. On the other hand, when taking video of a positive film, inversion processing by the negative / positive inversion circuit of the video camera is not performed. Also, when performing normal video shooting with the film adapter 2 removed, the reversing process is not performed.
[0005]
Conventionally, the video camera 1 is provided with a switch (mechanical switch) for reversing processing, and when the film 4 is a negative film, the user turns on the switch for reversing processing to perform the negative / positive reversing processing. Was performed.
[0006]
[Problems to be solved by the invention]
As described above, in the related art, when the user discriminates the type of film and shoots an image of the negative film as a video, the user needs to turn on a switch for inverting operation, which is troublesome.
[0007]
The present invention, in view of the prior art, automatically determines whether a negative film image is captured or a positive film image or a normal image that is not a film image. Another object of the present invention is to provide a video camera device that performs optimal signal processing according to each shooting situation.
[0008]
[Means for Solving the Problems]
The present invention which solves the above-mentioned problems,
A negative / positive inverting circuit capable of performing a negative / positive inverting process on the imaging signal;
An integration circuit that integrates a red signal R, a green signal G, and a blue signal B obtained by performing signal processing on an imaging signal to obtain a red integration value IR, a green integration value IG, and a blue integration value IB;
Control for obtaining the ratios IR / IG and IB / IG of the red integration value IR and the blue integration value IB to the green integration value IG, and _{obtaining the} white balance control signals R _cont and B _cont based on the ratios IR / IG and IB / IG. Department and
A video camera apparatus having a white balance control circuit that performs gain adjustment of the red signal R and the blue signal B according to the white balance control signals R _cont and B _cont to perform white balance control;
The control unit sets the ratio IR / IG, the ratio IR / IG, to the data coordinates around the ratio IR / IG and the ratio IB / IG when taking a film image of a positive film or taking a normal photograph without taking a film image. A data table in which a positive mode detection frame which is an area where IB / IG is detected and a negative mode detection frame which is an area where ratios IR / IG and IB / IG are detected when a film image of a negative film is taken. When the values of the ratios IR / IG and IB / IG fall within the positive mode detection frame, the negative / positive inversion processing by the negative / positive inversion circuit is not performed, and the ratios IR / IG and IB / IG are When the value falls within the negative mode detection frame, a negative / positive inversion process is performed by the negative / positive inversion circuit.
[0009]
Also, the present invention
A negative / positive inverting circuit capable of performing a negative / positive inverting process on the imaging signal;
An integration circuit that integrates a red signal R, a green signal G, and a blue signal B obtained by performing signal processing on an imaging signal to obtain a red integration value IR, a green integration value IG, and a blue integration value IB;
Control for obtaining the ratios IR / IG and IB / IG of the red integration value IR and the blue integration value IB to the green integration value IG, and _{obtaining the} white balance control signals R _cont and B _cont based on the ratios IR / IG and IB / IG. Department and
A video camera apparatus having a white balance control circuit that performs gain adjustment of the red signal R and the blue signal B according to the white balance control signals R _cont and B _cont to perform white balance control;
The control unit sets the ratios of IR / IG and IR / IG to the data coordinates around the ratios IR / IG and IB / IG when a film image of a color positive film is shot or when normal shooting without shooting a film image is performed. A positive mode detection frame which is an area where IB / IG is detected, a color negative mode detection frame which is an area where ratios IR / IG and IB / IG are detected when a film image of a color negative film is taken; A data table is set in which a monochrome negative mode detection frame is set, which is an area where the ratios IR / IG and IB / IG are detected when a film image is taken, and the values of the ratios IR / IG and IB / IG are stored. Does not perform the negative / positive reversal process by the negative / positive reversal circuit when the values of the ratios IR / IG and IB / IG are When entering the Negamodo detection frame within or monochrome negative mode detection frame is characterized in that to perform negative-positive reversal processing by the negative-positive inversion circuit.
[0010]
Also, the present invention
A negative / positive inverting circuit capable of performing a negative / positive inverting process on the imaging signal;
An integration circuit that integrates a red signal R, a green signal G, and a blue signal B obtained by performing signal processing on an imaging signal to obtain a red integration value IR, a green integration value IG, and a blue integration value IB;
Control for obtaining the ratios IR / IG and IB / IG of the red integration value IR and the blue integration value IB to the green integration value IG, and _{obtaining the} white balance control signals R _cont and B _cont based on the ratios IR / IG and IB / IG. Department and
A video camera apparatus having a white balance control circuit that performs gain adjustment of the red signal R and the blue signal B according to the white balance control signals R _cont and B _cont to perform white balance control;
The control unit sets the ratios of IR / IG and IR / IG to the data coordinates around the ratios IR / IG and IB / IG when a film image of a color positive film is shot or when normal shooting without shooting a film image is performed. A positive mode detection frame which is an area where IB / IG is detected, a color negative mode detection frame which is an area where ratios IR / IG and IB / IG are detected when a film image of a color negative film is taken; A data table is set in which a monochrome negative mode detection frame is set, which is an area where the ratios IR / IG and IB / IG are detected when a film image is taken, and the values of the ratios IR / IG and IB / IG are stored. Does not perform the negative / positive reversal process by the negative / positive reversal circuit when the values of the ratios IR / IG and IB / IG are When entering the negative mode detection frame, the negative / positive inversion processing is performed by the negative / positive inversion circuit. When the values of the ratios IR / IG and IB / IG enter the monochrome negative mode detection frame, the negative / positive inversion circuit is used. It is characterized in that a negative / positive inversion process is performed on the luminance signal of the image pickup signal and no color signal is output.
[0011]
According to the present invention, the photographing mode is determined according to the area in which the values of the ratios IR / IG and IB / IG obtained for the white balance control are located, and the photographing mode is automatically determined when photographing a negative film. And negative / positive reversal processing is performed.
[0012]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.
[0013]
FIG. 1 is a circuit diagram showing an imaging system of a video camera incorporating the present invention. As shown in FIG. 1, an optical image formed by the lens 11 is formed on a light receiving surface of the CCD 12, and an imaging signal S is output from the CCD 12. The gain of the imaging signal S is adjusted by the AGC circuit 13, converted into a digital signal by the A / D converter 14, and sent to the signal processing circuit 15.
[0014]
Interpolation processing circuit 16 of the signal processing circuit 15, and interpolation processing an image signal S, the image signal S, which is interpolation, the luminance signal Y and the color composite signal C _r by the color separation circuit 17 _and separated into C _b.
[0015]
The first negative / positive inverting circuit 18 receives a command from the camera microcomputer 19 and performs a negative / positive inverting process on the luminance signal Y when shooting a color negative film or a monochrome negative film, as described later. When a color negative film or a monochrome negative film is not photographed, the luminance signal Y is sent to the D / A converter 20 without performing inversion processing. The D / A converter 20 converts the luminance signal Y into an analog signal, and then sends the analog signal to the recording / reproducing system of the video camera.
[0016]
The second negative-positive inversion circuit 21, as described later, receives an instruction of the camera microcomputer 19, the luminance signal Y and color synthesis signal C _r, the C _b negative-is when taking color negative films and black and white negative film after the positive reversal processing, also sends without inversion processing when not taking color negative films and black and white negative film, a luminance signal Y and color synthesis signal C _r, the C _b to RGB matrix circuit 22.
[0017]
RGB matrix circuit 22, the red signal R, green signal G, and outputs the form blue signal B and the luminance signal Y and color synthesis signal _C r, the _{C b} and matrix operations. The white balance control circuit 23 performs white balance control by adjusting the gain of the red signal R and the blue signal B based on the white balance control signals R _cont and B _cont sent from the camera microcomputer 19.
[0018]
The color difference matrix circuit 24 performs a matrix operation on the red, green, and blue color signals R, G, and B that have been subjected to white balance control, to form two types of color difference signals RY and BY. The encoding circuit 25 encodes the color difference signals RY and BY and outputs a color signal C. The color signal C is converted into an analog signal by the D / A converter 20 and sent to the recording / reproducing system of the video camera.
[0019]
The integrating circuit 26 integrates the red signal R, the green signal G, and the blue signal B for each field to obtain a red integrated value IR, a green integrated value IG, and a blue integrated value IB.
[0020]
The camera microcomputer 19 obtains a ratio IR / IG of the integral value IR to the integral value IG and a ratio IB / IG of the integral value IB to the integral value IG. And (IR / IG) = (IB / IG) = 1
The white balance control signals R _cont and B _cont are calculated as follows. Further, although details will be described later, when the camera microcomputer 19 is in the auto mode (described later), the video camera determines the following (1) (2) (3) based on the values of the ratios IR / IG and IB / IG. It is determined which of the shooting modes is the shooting mode.
[0021]
(1) Positive mode in which a film image of a color positive film is taken, or in which normal filming without taking a film image by removing the film adapter 2 is performed.
(2) A color negative mode in which a film image of a color negative film is taken.
(3) Monochrome negative mode for shooting a film image of a monochrome negative film.
[0022]
The camera microcomputer 19 is connected with an auto / manual changeover switch 27 and a reversal / non-reversal changeover switch 28. When the auto / manual changeover switch 27 is turned on to the “manual” side, the camera microcomputer 19 enters the manual mode. In this manual mode, when the reversing / non-reversing switch 28 is turned to the "non-reversing" side, the negative / positive reversing circuits 18 and 21 do not perform reversing processing according to a command from the camera microcomputer 19, and perform reversing / non-reversing. When the changeover switch 28 is turned to the “reverse” side, the negative / positive reversing circuits 18 and 21 perform reversal processing in accordance with a command from the camera microcomputer 19.
[0023]
On the other hand, when the auto / manual changeover switch 27 is turned on to the "auto" side, the camera microcomputer 19 is set to the auto mode, and the photographing mode is set to any one of the above three modes (1) to (3). Is automatically determined, and an operation command corresponding to the determined mode is issued.
[0024]
Here, a method of automatically determining a shooting mode by the camera microcomputer 19 and an operation according to the determination will be described.
[0025]
A data table as shown in FIG. 2 is stored in the camera microcomputer 19 in advance. That is, a data table in which the positive mode detection frame A1, the color negative mode detection frame A2, and the monochrome negative mode detection frame A3 are stored in data coordinates where the vertical axis is the ratio IB / IG and the horizontal axis is the ratio IR / IG.
[0026]
The positive mode detection frame A1 is an area where the ratio IB / IG and the ratio IR / IG are detected when a film image of a color positive film is shot or when a normal shooting without a film image is shot. Yes, set in advance by experiment.
[0027]
The color negative mode detection frame A2 is a region where the ratio IB / IG and the ratio IR / IG are detected when a film image of a color negative film is taken, and is obtained and set in advance by an experiment.
[0028]
The monochrome negative mode detection frame A3 is an area where the ratio IB / IG and the ratio IR / IG are detected when a film image of a monochrome negative film is taken, and is obtained and set in advance by an experiment.
[0029]
When the auto / manual changeover switch 27 is turned on to the "auto" side to enter the auto mode, the camera microcomputer 19 causes the negative / positive reversing circuits 18 and 21 to perform reversal processing for a few field periods from the time when the switch 27 is turned on. Command not to.
Then, the integrated values IR, IG, and IB obtained by processing the signal that has not been subjected to the inversion processing are fetched.
Next, the ratios IB / IG and IR / IG are calculated. Then, the values of the calculated ratios IB / IG and IR / IG are detected.
Further, it is checked which of the detection frames A1, A2, A3 the values of the ratios IB / IG, IR / IG fall into. If the value is within the detection frame A1, it is determined that the mode is the positive mode. If the value is within the detection frame A2, it is determined that the mode is the color negative mode. If the value is within the detection frame A3, it is determined that the mode is the monochrome negative mode. I do.
[0030]
When the camera microcomputer 19 determines that the shooting mode is the positive mode in the auto mode, the camera microcomputer 19 keeps the state in which the negative / positive reversing circuits 18 and 21 do not perform the reversing process. Then, using the ratios IB / IG and IR / IG obtained by integrating and dividing the signal that has not been inverted, the white balance control signal R such that (IB / IG) = (IR / IG) = 1 is obtained. _cont and B _cont are output. The white balance control circuit 23 performs white balance control based on the white balance control signals R _cont and B _cont .
[0031]
If the camera microcomputer 19 determines that the shooting mode is the color negative mode in the auto mode, the camera microcomputer 19 instructs the negative / positive reversing circuits 18 and 21 to perform reversal processing. Then, using the ratios IB / IG and IR / IG obtained by integrating and dividing the inverted signal, a white balance control signal R _cont , such that (IB / IG) = (IR / IG) = 1, is used. Output B _cont . The white balance control circuit 23 performs white balance control based on the white balance control signals R _cont and B _cont .
[0032]
Further, when the camera microcomputer 19 determines that the shooting mode is the monochrome negative mode in the auto mode, the camera microcomputer 19 instructs the negative / positive reversing circuits 18 and 21 to perform reversal processing. Then, using the ratios IB / IG and IR / IG obtained by integrating and dividing the inverted signal, a white balance control signal R _cont , such that (IB / IG) = (IR / IG) = 1, is used. Output B _cont . The white balance control circuit 23 performs white balance control based on the white balance control signals R _cont and B _cont .
[0033]
When it is determined that the mode is the monochrome negative mode, the operation of the color signal processing system (circuits 21, 22, 23, 24, and 25) is stopped in accordance with a command from the camera microcomputer 19 so that the color signal C is not output. Only the luminance signal Y inverted by the positive inversion circuit 18 may be output.
[0034]
Monochrome negative films have a large amount of purple color components due to the influence of the purple base color, and if the white balance control is insufficient when the color signal processing system is activated, the image quality of the reproduced image However, if the operation of the color signal processing system is stopped or the gain of the color signal is reduced to output only the luminance signal, such a problem does not occur.
[0035]
After all, if the auto / manual changeover switch 27 is turned on to the "auto" side and the mode is set to the auto mode, the negative / positive reversal is automatically performed when taking a negative film, so that it can be easily performed regardless of the type of the film. Film images can be taken.
[0036]
In the video camera apparatus of the above embodiment, the automatic white balance control is performed by feedback control. However, the present invention can be applied to a video camera apparatus of a type in which the automatic white balance control is feed-forward controlled. It is.
[0037]
【The invention's effect】
As described above in detail with the embodiment, according to the present invention, it is determined whether the mode is the positive mode or the negative mode based on the values of the ratios IR / IG and IB / IG. Since the positive / reverse processing is performed, the user does not need to issue a negative / positive reversal processing command by operating a switch, thereby simplifying the operation. Therefore, regardless of the type of the film (whether the film is a negative film or a positive film), the user can take a film image and shoot a video of the film image satisfactorily.
[0038]
In addition, by not outputting a color signal when photographing a monochrome negative film, the image quality of a monochrome image can be improved.
[Brief description of the drawings]
FIG. 1 is a circuit diagram showing an imaging system of a video camera to which the present invention is applied.
FIG. 2 is a characteristic diagram showing an area of a detection frame.
FIG. 3 is a configuration diagram showing an attachment and a video camera used for photographing a film image.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Video camera 2 Attachment 3 Film carrier 4 Film 11 Lens 12 CCD
13 AGC circuit 14 A / D converter 15 Signal processing circuit 16 Interpolation processing circuit 17 Color separation circuit 18 Negative / positive inverting circuit 19 Camera microcomputer 20 D / A converter 21 Negative / positive inverting circuit 22 RGB matrix circuit 23 White balance control Circuit 24 Color difference matrix circuit 25 Encoding circuit 26 Integrating circuit 27 Auto / manual changeover switch 28 Inversion / non-inversion changeover switch R _cont white balance control signal B _cont white balance control signal A1 Positive mode detection frame A2 Color negative mode detection frame A3 Monochrome negative mode detection frame

Claims (3)

A negative / positive inverting circuit capable of performing a negative / positive inverting process on the imaging signal;
An integration circuit that integrates a red signal R, a green signal G, and a blue signal B obtained by performing signal processing on an imaging signal to obtain a red integration value IR, a green integration value IG, and a blue integration value IB;
Control for obtaining the ratios IR / IG and IB / IG of the red integration value IR and the blue integration value IB to the green integration value IG, and _{obtaining the} white balance control signals R _cont and B _cont based on the ratios IR / IG and IB / IG. Department and
A video camera apparatus having a white balance control circuit that performs gain adjustment of the red signal R and the blue signal B according to the white balance control signals R _cont and B _cont to perform white balance control;
The control unit sets the ratio IR / IG, the ratio IR / IG, to the data coordinates around the ratio IR / IG and the ratio IB / IG when taking a film image of a positive film or taking a normal photograph without taking a film image. A data table in which a positive mode detection frame which is an area where IB / IG is detected and a negative mode detection frame which is an area where ratios IR / IG and IB / IG are detected when a film image of a negative film is taken. When the values of the ratios IR / IG and IB / IG fall within the positive mode detection frame, the negative / positive inversion processing by the negative / positive inversion circuit is not performed, and the ratios IR / IG and IB / IG are A video camera apparatus wherein a negative / positive reversal process is performed by the negative / positive reversal circuit when a value falls within a negative mode detection frame. A negative / positive inverting circuit capable of performing a negative / positive inverting process on the imaging signal;
An integration circuit that integrates a red signal R, a green signal G, and a blue signal B obtained by performing signal processing on an imaging signal to obtain a red integration value IR, a green integration value IG, and a blue integration value IB;
Control for obtaining the ratios IR / IG and IB / IG of the red integration value IR and the blue integration value IB to the green integration value IG, and _{obtaining the} white balance control signals R _cont and B _cont based on the ratios IR / IG and IB / IG. Department and
A video camera apparatus having a white balance control circuit that performs gain adjustment of the red signal R and the blue signal B according to the white balance control signals R _cont and B _cont to perform white balance control;
The control unit sets the ratios of IR / IG and IR / IG to the data coordinates around the ratios IR / IG and IB / IG when a film image of a color positive film is shot or when normal shooting without shooting a film image is performed. A positive mode detection frame which is an area where IB / IG is detected, a color negative mode detection frame which is an area where ratios IR / IG and IB / IG are detected when a film image of a color negative film is taken; A data table is set in which a monochrome negative mode detection frame is set, which is an area where the ratios IR / IG and IB / IG are detected when a film image is taken, and the values of the ratios IR / IG and IB / IG are stored. Does not perform the negative / positive reversal process by the negative / positive reversal circuit when the values of the ratios IR / IG and IB / IG are Video camera apparatus characterized by causing a negative-positive reversal processing by the negative-positive inversion circuit when entering Negamodo detection frame within or monochrome negative mode detection frame. A negative / positive inverting circuit capable of performing a negative / positive inverting process on the imaging signal;
An integration circuit that integrates a red signal R, a green signal G, and a blue signal B obtained by performing signal processing on an imaging signal to obtain a red integration value IR, a green integration value IG, and a blue integration value IB;
Control for obtaining the ratios IR / IG and IB / IG of the red integration value IR and the blue integration value IB to the green integration value IG, and _{obtaining the} white balance control signals R _cont and B _cont based on the ratios IR / IG and IB / IG. Department and
A video camera apparatus having a white balance control circuit that performs gain adjustment of the red signal R and the blue signal B according to the white balance control signals R _cont and B _cont to perform white balance control;
The control unit sets the ratios of IR / IG and IR / IG to the data coordinates around the ratios IR / IG and IB / IG when a film image of a color positive film is shot or when normal shooting without shooting a film image is performed. A positive mode detection frame which is an area where IB / IG is detected, a color negative mode detection frame which is an area where ratios IR / IG and IB / IG are detected when a film image of a color negative film is taken; A data table is set in which a monochrome negative mode detection frame is set, which is an area where the ratios IR / IG and IB / IG are detected when a film image is taken, and the values of the ratios IR / IG and IB / IG are stored. Does not perform the negative / positive reversal process by the negative / positive reversal circuit when the values of the ratios IR / IG and IB / IG are When entering the negative mode detection frame, the negative / positive inversion processing is performed by the negative / positive inversion circuit. When the values of the ratios IR / IG and IB / IG enter the monochrome negative mode detection frame, the negative / positive inversion circuit is used. A video camera apparatus wherein a negative / positive inversion process is performed on a luminance signal of an imaging signal and a color signal is not output.

Images