JPH06197372A - Video reproduction device - Google Patents

Abstract

PURPOSE:To provide the video reproduction device in which white balance is controlled with high accuracy. CONSTITUTION:A video signal designated to a reference video signal is read from an HDD(hard disk) 1 on which plural video signals are recorded, a color temperature is detected from a color difference signal obtained through signal processing and the gain of a variable gain amplifier 7 is controlled accordingly so as to minimize the integration value of the color difference signal and the control variable at that time is latched. White balance is controlled by using the control variable at the time of reproduction of other video signal. A reference video signal obtained from a white object or the like is used to attain white balance control with high accuracy.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to white balance control of a video reproducing apparatus for reproducing a video signal recorded on a recording medium by an electronic still camera or the like.

[0002]

2. Description of the Related Art Conventionally, in a device such as a video camera or an electronic still camera, a color reproduction of a photographed video signal is reproduced by controlling a gain of a color signal at the time of photographing according to a color temperature of a light source illuminating an object. The so-called white balance control is performed to prevent the color temperature from becoming unnatural. As the white balance control method, a method of controlling the gain of the color signal by using color temperature information obtained from a sensor that detects the color temperature or by controlling the gain of the color signal so that the integrated value of the color difference component of the image signal of the subject is reduced Has been.

In general, the method of utilizing the color difference component of the captured video signal is more advantageous in terms of size and cost than the method of using a sensor for detecting the color temperature. However, in any case, these devices perform white balance control on a captured video signal at the time of recording, and the video signal whose color signal gain is controlled to a desired value is recorded on a recording medium. ing.

[0004]

However, in a device such as a video camera or an electronic still camera which needs to be miniaturized, the circuit scale for performing white balance control, power consumption, etc. are large in the overall system. , Which is a factor limiting the miniaturization of the entire device.

Further, in the method of performing white balance control by using a captured video signal, which is generally advantageous in size and cost, as compared with the method of using a sensor for detecting a color temperature, in the method of performing white balance control, May not be able to control with sufficient accuracy. For example, when a subject contains many vivid color components, the gain control of the color signal is performed in a direction to suppress the vivid color component, so that there is a problem in that the vividness is inevitable in the color reproduction of the captured video signal. It was

The present invention has been made in order to solve the above problems, and an image in which white balance control can be performed without losing the vividness of colors even in the case of a subject having a large average value of color difference components. The purpose is to obtain a playback device.

[0007]

In the first invention,
A plurality of video signals are recorded, and designation data designating a reference video signal serving as a reference for white balance control among them and designation data designating which reference video signal other video signal uses are recorded. Detecting means for selectively reproducing the video signal from the recording medium, and detecting the reference video signal or another video signal based on the designated data of the video signal instructed to be reproduced; The signal processing means for reproducing the reference video signal to obtain a white balance control value, and holding the white balance control value, and the retained control value when reproducing the other detected video signal are used. A control means for performing white balance control is provided.

According to the second aspect of the invention, the designation means for designating that the video signal instructed to be reproduced from the recording medium on which a plurality of video signals are recorded is used as the reference video signal for obtaining the control value of the white balance control. And a signal processing means for reproducing the specified reference video signal to obtain the control value, and holding the control value, and the held control when reproducing the other video signal not specified by the specifying means. A control means for performing white balance control using the value is provided.

[0009]

By specifying, as the reference video signal, a video signal obtained by shooting, for example, a colorless subject or a gray or white subject shot under the same light source as other video signals, a white obtained from this reference video signal is designated. Since the white balance control of the other video signal is performed using the control value of the balance control, the white balance of the screen of the other video signal is controlled with high accuracy.

[0010]

1 shows a video reproducing apparatus according to a first embodiment of the present invention.

In FIG. 1, reference numeral 1 denotes a hard disk device (hereinafter abbreviated as HDD) as a video recording medium, which is detachably mounted. Reference numeral 2 is a control unit that controls the HDD 1 and the whole, and 3 is a control unit 2 that controls the video signal read from the HDD 1.
The memory 4 controlled and stored by the adder 4 is an adder for adding the signals read from the memory 3 according to the field as will be described later. Is a luminance signal processing circuit for creating.

[0012] 6 the color signal processing circuit processes the video signal obtained from the adder 4 to create the color signals of R _1, G _1, B _1, 7 is the R _1, G _1, B ₁ of the chrominance signal A variable gain amplifier for controlling gains and outputting R, G, B color signals, and 8 for matrix operation of R, G, B color signals
A matrix circuit for creating Y, BY color difference signals, 9 an encoder for creating a composite video signal from the RY, BY color difference signals and the luminance signal Y, 10 an analog signal of the composite video signal D / A converter for conversion, 11 is an adder for adding the sync signal from the control unit 2 to the D / A converted composite video signal, and 12 is the control unit 2 for adding the composite video signal to which the sync signal is added. The driver 13 is controlled by the driver 13, the monitor 13 is controlled by the driver 12 and displays an image, and 19 is an operation unit having various operation switches.

Reference numeral 14 is a data detector for detecting specified data relating to white balance, which will be described later, from the signal read from the HDD 1 and sending it to the controller 2, and 15 is the color difference signal R.
-Y, BY A color temperature detection unit that detects the color temperature of the video signal under the control of the control unit 2, and 16 holds the detected color temperature under the control of the control unit 2 and white balances the color temperature. Is a hold circuit for controlling the gain of the variable gain amplifier 7 as the control value of.

FIG. 2 shows a camera section for photographing a subject and recording it in the HDD 1. The HDD 1 is detachably attached, and after being photographed and recorded by this camera unit, it is detached and attached to the video reproducing apparatus of FIG. 1 for reproduction. Alternatively, the camera unit and the video reproduction device may be integrally configured.

In FIG. 2, 20 is a control unit for controlling the whole, 21 is an optical system including a lens, a diaphragm, and the like, and 22 is an image pickup unit including a CCD as an image pickup element. In the CCD, color filters as shown in FIG. 3 are arranged for each pixel.
As shown in the figure, this color filter uses Mg (magenta) and G
Repeated line of (green), Cy (cyan) and Ye
The lines of Mg and G have a so-called checkered arrangement of complementary colors in which the phase is inverted for each line.

Reference numeral 23 is an A / D converter for converting the signal photoelectrically converted by the image pickup unit 22 into a digital value, and 24 is a memory such as a semiconductor memory to which the output signal of the A / D converter 23 is inputted. A signal for one screen photoelectrically converted by the CCD is stored in 24 as a digital value. Two
Reference numeral 5 is an adder, and the designated data relating to white balance output from the control unit 20 is added to the signal read from the memory 24, output, and recorded in the HDD 1. An operation unit 26 includes various operation switches such as a specification switch for creating specified data.

Next, the operation of the above configuration will be described.

In the present embodiment, when the camera section shoots a plurality of times and the plurality of video signals are recorded in the HDD 1,
One of them is designated as a reference video signal which is a reference for obtaining the control value of the white balance control at the time of reproduction, and designation data indicating that is specified as the reference video signal and its HD.
Record along with position data indicating position on D1. Then, for the remaining video signals, designated data (corresponding to position data of the reference video signal) that specifies at which position the video signal recorded at the time of reproduction of the video signal is used as the reference video signal for white balance control. Record with each video signal.

As the reference video signal, for example, a standard plate of neutral gray or a signal obtained by photographing a subject with a lot of white is used.

At the time of reproduction, the reference video signal among the plurality of video signals is reproduced to obtain a control value for white balance control, and the gain of the variable gain amplifier 7 is determined by this control value. When reproducing another video signal, white balance control using the above control value is performed.

Next, the recording / reproducing operation will be described in detail.

In the camera section of FIG. 2, the operation section 26 is provided with a switch for selectively designating whether or not the signal to be photographed is used as a reference video signal for determining the control value of the white balance control during reproduction. When this switch is selected not to be used as a reference video signal, a switch for designating which video signal to use as the reference video signal for determining the white balance control value during reproduction is provided. The operator sets these switches before photographing the subject. The switch information set here is sent to the adder 25 from the control unit 20 as designated data, and is recorded in the HDD 1 when the video signal is recorded. In FIG. 2, when the release switch of the operation unit 26 is operated, the control unit 20 controls the aperture of the optical system 21 and determines the exposure time so that the CCD of the image pickup unit 22 can obtain proper exposure, and the optical system 21 and the imaging unit 22 are controlled. Next, a signal is read out from the CCD for which an appropriate exposure amount has been obtained, and this is input to the A / D converter 23.
Here, the electric signal corresponding to the pixel of the CCD is converted into a digital value. C output from the A / D converter 23
The signal corresponding to the pixel of the CD is input to the memory 24 and temporarily stored.

Next, a signal is transferred from the memory 24 to the HDD 1. At this time, prior to reading the signal from the memory 24, a reference for determining the control value of the white balance control at the time of reproducing the signal photographed this time. Designation data indicating the recording area (position) of the reference video signal used at the time of reproduction is output from the control unit 20, and the predetermined recording area of the HDD 1 (via the adder 25). Position). Next, the control unit 20 controls the memory 24 to read the stored signal and record it in a predetermined recording area of the HDD 1 via the adder 25.

The video signal photographed by the camera unit as described above is recorded in the HDD 1 together with the designation data relating to the white balance control. Next, a description will be given of the operation when the HDD 1 on which the video signal is recorded is removed and attached to the video reproducing apparatus shown in FIG. 1 to reproduce the video signal.

In FIG. 1, when the operation unit 19 instructs reproduction of a certain video signal, the control unit 2 reads the signal from the HDD 1. The signal to be read is designated data regarding white balance control of the recorded video signal, which is detected by the data detection unit 14 and input to the control unit 2.

Next, the control unit 2 determines whether or not the video signal instructed to be reproduced is the reference video signal. If it is a reference video signal, the data of this video signal is read from the HDD 1 for one screen and written in the memory 3. Further, position data indicating the recording area of the video signal at this time is stored in the control unit 2. The video signal for one screen written in the memory 3 is controlled so that two lines of the image pickup device used in the above-mentioned camera section are read out at the same time.

Specifically, as shown in FIG. 3, when reading the first field, 1, 2 lines, 3, 4 lines, ...
.., 2 _{n + 1} , 2 _{(n + 1)} lines, 2, 3 lines, 4, 5 lines when reading the second field, 2 _n ,
2 _{n + 1} lines are simultaneously read from the memory 3 and the read signals are added by the adder 4. The output signal of the adder 4 is a luminance signal processing circuit 5 and a color signal processing circuit 6.
Entered in and. The luminance signal processing circuit 5 forms a luminance signal Y from the input signals of Mg, G, Cy and Ye and outputs it to the encoder 9. The color signal processing circuit 6 forms R ₁ , G ₁ , and B ₁ signals from the input video signal and outputs the signals to the variable gain amplifier 7.

At this time, the output signal of the hold circuit 16 for controlling the gain of the variable gain amplifier 7 is released by the control unit 2, and the output signal of the color temperature detection unit 15 is output as it is. That is, when the current signal is continuously processed from the state where the previous video signal was processed, the final output signal when the previous video signal is processed is output from the color temperature detection unit 15. This is the control input of the variable gain amplifier 7 via the hold circuit 16. Here, the gain control of the variable gain amplifier 7 is performed by a control signal for the gain of each of the R ₁ , G ₁ and B ₁ signals which is an input.

Next, the gain-controlled R, G, B signals are input from the variable gain amplifier 7 to the matrix circuit 8. The matrix circuit 8 creates and outputs an RY signal and a BY signal by a known matrix calculation. The output RY,
The BY signal is input to the encoder 9 and the color temperature detection unit 15. The color temperature detection unit 15 inputs RY and B-
The Y signal is integrated over one field period, and the control signal for the variable gain amplifier 7 is updated via the hold circuit 16 for each field according to the integration result, and R-Y,
The gains of the R, G and B signals are controlled so that the integrated value of BY is close to "0". That is, a control loop for controlling the variable gain amplifier 7, the matrix circuit 8, the color temperature detector 15, and the hold circuit 16 so that the integrated value of the RY and BY signals over one field period becomes close to "0". Composed. White balance control is performed by this control loop.

Next, the RY and BY signals and the Y signal output from the luminance signal processing circuit 5 are input to the encoder 9, where a composite video signal is formed and D / A
It is converted into an analog signal by the converter 10. Next, in the adder 11, the synchronization signal is added from the control unit 2 to the signal output from the D / A converter 10, and then the driver 12
Entered in. Then, it is output as a video signal from the driver 12 and displayed on the monitor 13.

The above is the operation when the video signal read from the HDD 1 is determined to be the reference video signal based on the designated data. Next, the operation when it is determined that the video signal is not the reference video signal based on the designated data will be described.

As described above, in such a case, the HDD
Since the position data indicating the recording area of the reference video signal with respect to the video signal read from No. 1 is recorded as the designated data, this data is detected by the data detection unit 14. The detected video signal recording area is compared with the position data of the video signal storage area stored in the control unit 2, that is, the position data indicating the storage area of the reference video signal for which the white balance control was performed last time, If they are the same,
The control unit 2 controls the hold circuit 16 to the hold state, holds the output value of the color temperature detection unit 15 at that time,
This is continuously output to the variable gain amplifier 7. That is, the white balance control of the video signal to be read from now on is performed by the same control value without newly performing the white balance control.

Next, the control unit 2 reads out the video signal instructed to be reproduced from the HDD 1 and writes it in the memory 3. Then, video signal processing is performed in the same manner as in the above case, and the reproduced video signal is output from the driver 12. At this time, for the white balance control, the output of the color temperature detector 15 is newly added to the hold circuit 1 as described above.
6 is not output to the variable gain amplifier 7,
The value obtained by holding the output signal of the previous color temperature detection unit 15 is added to the variable gain amplifier 7, and the control input is kept constant.

Position data indicating the recording area of the video signal for performing white balance control on the video signal to be reproduced next is stored in the control unit 2 and the reference video signal subjected to the previous white balance control. A case where the position data is different from the position data in the storage area will be described.

In this case, the control unit 2 stores the position data indicating the recording area of the video signal for performing the white balance control, reads the reference video signal recorded in this recording area, and stores it in the memory 3. Write. Next, the video signal written in the memory 3 is read out and white balance control is performed. That is, at this time, the hold circuit 16 is released from the hold by the control unit 2 and the color temperature is newly detected, whereby the control loop for controlling the variable gain amplifier 7 is operated. However, the reproduced video signal at this time is not output from the output terminal by controlling the driver 12 in the mute state.

When the white balance control is completed in this way, the control section 2 puts the hold circuit 16 in the hold state and holds the white balance control value at this time. Next, the video signal instructed to be reproduced is read from the HDD 1 and written in the memory 3. Next, the signal is read from the memory 3, the reproduction processing is performed without updating the white balance control value, and the mute of the driver 12 is released by the control unit 2 to output the reproduced video signal to the output terminal. Will be done.

It is to be noted that, during the processing of the video signal for performing white balance control performed prior to the processing of the video signal instructed to be reproduced, all the data of the video signal for one screen is not used and the thinned-out video is used. Processing may be performed by signals.

As a thinning-out method, the video signal is stored in the HDD.
It may be carried out when the video signal is transferred from 1 to the memory 3, or it may be carried out when the memory 3 is read.

FIG. 4 shows a second embodiment of the present invention. In the figure, the same components as those in FIG. 1 are designated by the same reference numerals and the description thereof will be omitted.

In FIG. 4, reference numeral 17 is an arithmetic circuit to which the signal read from the HDD 1 is input. The arithmetic circuit 17 includes a variable delay line whose maximum delay amount is equivalent to 1H of the CCD shown in FIG. 3, in which an addition process between lines of signals obtained from the CCD is performed. ing. Reference numeral 18 denotes a memory, and the composite video signal output from the encoder 9 is input to the memory 18. Further, the writing and reading of signals to and from the memory 18 are controlled by the control unit 2.

Next, the operation when the control section 2 is instructed to reproduce the video signal will be described. First, the control unit 2 is an HDD
Prior to the reading of the video signal, the data detection unit 14 obtains the designated data relating to the white balance control of the video signal. When the designated data obtained from the data detection unit 14 designates the reference video signal recorded in another area, the designated reference video signal is first read from the HDD 1. ,
At this time, the control unit 2 sets the delay amount of the variable delay line included in the arithmetic circuit 17 to 1 / 2H, reads from the HDD 1 a video signal in which the data amount is halved in the horizontal direction, and calculates this. Output to the circuit 17. In the arithmetic circuit 17, the addition processing between lines is performed here, and the signal is converted into the color signal processing circuit 6
And the luminance signal processing circuit 5. Then, the output signal of the color temperature detection unit 15 is held by the subsequent processing,
Although the white balance control value is obtained, the output signal of the encoder 9 is not written in the memory 18 at this time.

Next, the control unit 2 reads the video signal instructed to be reproduced from the HDD 1 and sets the delay amount of the variable delay line of the arithmetic circuit 17 to 1H. The video signal thus read is subjected to addition processing between lines in the arithmetic circuit 17 and output. Further processing is performed and the encoder 9
The composite video signal is output to the memory 18.
At this time, the control unit 2 controls the memory 18 so that the output signal of the encoder 9 is written in the memory 18, and the reproduced video signal is written in the memory 18.

Next, the control unit 2 reads the video signal from the memory 18, the synchronizing signal is added by the adder 11 and the reproduced video signal is output from the driver 12 to the monitor 13.

When reproduction of another video signal is instructed and another video signal is instructed as the reference video signal of this video signal, the control unit 2 performs processing for obtaining the control value of the white balance. While the signal stored in the memory 18 is continuously read while a new control value is obtained and the video signal instructed to be reproduced is processed thereafter, the content of the memory 18 is updated to reproduce the reproduced image. Control to switch the signal output. By doing so, the reproduction output of the video signal can be switched without a feeling of strangeness.

Next, a third embodiment of the present invention will be described.

In this embodiment, a plurality of video signals specifying the same reference video signal as the reference video signal for performing white balance control are simultaneously reproduced as a group on the same screen as shown in FIG. Is to do.
In addition, by the switch to specify the number of screens displayed at the same time, 4,
The multi-screens of 9, 16, and 25 screens are selectable. Here, the multi-screen reproduction of the four screens A, B, C, and D will be described as shown in FIG.

When this multi-screen reproduction mode is instructed, in FIG. 1, the control unit 2 reads a signal from the HDD 1, the data detection unit 14 discriminates the designated data, and the reference image read subsequently to the data is read. The video signal designated to perform white balance control using the signal is transferred to the area of the memory 3 corresponding to the area A in FIG. When the video signal data is transferred from the HDD 1 to the memory 3, the video signal data is thinned according to the number of multi-screens. Here, the data is thinned to 1/2 and transferred to the memory 3 in both the H and V directions.

Next, the control unit 2 further reads out designated data in another recording area of the HDD 1 and searches for a video signal belonging to the same group as the video signal previously transferred to the memory 3.

When the video signal is searched and the designated data of the video signal of the same group is read out, the data of the signal is thinned out to 1/2 in both the H and V directions to correspond to B in FIG. 5 of the memory 3. Transfer to the area to be used. Further, the search is repeated, and similarly, video signals belonging to the same group are thinned out and transferred to the areas corresponding to C and D of the memory 3.

In this way, when the video signals for four screens are thinned out and stored in the memory 3 as the video signals for one screen, the control unit 2 operates the memory 3 in the same manner as described above. Start reading the video signal. At this time, as the integration period of the RY and BY signals output from the matrix circuit 8 in the color temperature detection unit 15, the period in which the reference video signal is read from the memory 3, that is, the area A in FIG. That is, the color temperature detection is performed using only this reference video signal. Then, the gain control of the variable gain amplifier 7 is performed via the hold circuit 16.
When the white balance control loop is thus converged, the control unit 2 puts the hold circuit 16 in the hold state, and the output value of the color temperature detection unit 15 at this time continues to be output from the hold circuit 16. White balance control is performed by this output value, and the gain of the variable gain amplifier 7 is controlled. As a result, the multi-screen reproduction output signal of four screens with white balance is output to the output of the driver 12, and the display of FIG.

When the control unit 2 is further instructed to switch the reproduction signal, the control unit 2 searches again the recording area of another video signal of the HDD 1 and transfers the reference video signal to the area corresponding to A of the memory 3. Then, the video signal in the area A is updated. Further, the search for the video signal of the HDD 1 is continuously performed and the signals are sequentially transferred to the areas B, C, and D. After that, the video signals are sequentially read from the memory 3 to reproduce the multi-screen.

During the search of the video signal, that is, in FIG.
Before the transfer of the video signal to the entire area of B, C, D is completed, H
When the search of all the recording areas of the DD1 is completed, the control unit 2 writes a gray level signal in the remaining areas.

As described above, the multi-screen reproduction of the video signal belonging to the grape in which the same reference video signal is designated as the video signal for determining the white balance control value is performed. At that time, the white balance control is performed by the reference video signal designated for the first multi-screen reproduction, the control value is determined, and this is held, and then the multi-screen reproduction is performed by the same control value.

When a multi-screen such as 16 or 25 screens is selected as the multi-screen, first, the video signal for performing white balance control is not thinned out or the predetermined video signal is skipped for one screen. The data amount of is stored in the memory 3, the signal is read from the memory 3 to determine the white balance control value, and the white balance control value is held. After that, the video signals are thinned out and stored in the memory 3 by a predetermined number of screens, and the read video signals are obtained by reading the video signals.
Good white balance control is performed even during multi-screen multi-screen playback.

Next, a fourth embodiment of the present invention will be described.

In the present embodiment, the designated data regarding white balance is not recorded at the time of photographing. Then, at the time of reproduction, for each video signal to be reproduced, it is selected whether the video signal itself is used as the reference video signal or another video signal is designated as the reference video signal. A selection switch for making this selection is provided on the operation unit 19. In addition, this embodiment uses the circuit of FIG.

When the video signal to be reproduced is designated by the operation unit 19 and the video signal itself is designated as the reference video signal, this video signal is read from the HDD 1,
The color temperature is detected in the same manner as described above, and the control loop is configured to determine the white balance control value. Then, a reproduction video signal subjected to white balance control is obtained by this control value.

While the white balance control is being performed by the control loop, the video signal previously processed and stored from the memory 18 in FIG. 4 is continuously read out and displayed on the monitor 13. Has been done.

Next, a case will be described in which a white balance control value is obtained from a designated reference video signal and reproduction processing is performed based on the control value. First, a case where reproduction is performed by using a multi-screen as shown in FIG. 6 as a fifth embodiment will be described. When a multi-screen reproduction instruction is given to the control unit 2 from the operation unit 19, the control unit 2 reads a video signal from the HDD 1 and performs the above-described reproduction process on this signal. The white balance control ends and the processed video signal is written in the memory 18 at this time. At this time, the signal written in the memory 18 is the encoder 9
The output signal is a signal thinned out according to the number of multi-screens. In the case of FIG. 6, description will be made by taking a multi-screen reproduction of 25 screens as an example, but the number of screens is not limited to this. Therefore, in this case, the signal written in the memory 18 is a signal decimated to 1/25, and this signal is written. The area written in the memory 18 at this time is the one area which is reproduced at the upper left of FIG.

Next, another video signal is read from the HDD 1, and this signal is also subjected to white balance control by the white balance control loop as described above, and is processed in the area 2 in FIG. 6 of the memory 18. The finished data is thinned out and written. Similarly, the video signals corresponding to the areas numbered 3 to 25 in FIG. 6 are controlled to be written in the memory 18 in the same manner. In this way, the video signals for 25 screens are respectively subjected to white balance control, data is thinned out and written in the memory 18.

When the writing of the data of 25 screens is completed, the control section 2 reads the data from the memory 18 and outputs it. This signal is sent to the driver 1 via the D / A converter 10.
2 is output to the monitor 13 as a video signal which is a multi-screen reproduction of 25 screens. Here, the operator is the monitor 1
While confirming No. 3, the operation unit 19 is instructed for the reference video signal for obtaining the white balance control value. This is done by the numbers of the screen divided into 25 as shown in FIG. 6, but it is also possible to put the cursor on the screen and point with the mouse.

Next, using the control value obtained from this reference video signal, the video signal to be displayed is designated in the same manner from the 25-divided screen. When the control unit 2 receives this instruction via the operation unit 19, first, the reference video signal is sent to the HDD.
The signal is read again from 1, and the white balance control described above is performed on this signal. When the white balance control is completed, the hold circuit 16 is placed in the hold state to hold the output of the color temperature detection unit 15. At this time, the processed reference video signal is not written in the memory 18.

Next, the video signal instructed to perform the reproduction process is read from the HDD 1 and processed. At this time, the white balance control value obtained by processing the reference video signal is used to write the video signal in which the gains of the R, G, and B signals are controlled to the memory 18, and the data for one screen is written. Then, it is read and output to the monitor 13.

Based on the white balance control value obtained by designating the reference video signal for obtaining the white balance control value from the video signals subjected to the multi-screen reproduction as described above and processing it. , The reproduction processing of the video signal instructed to be reproduced is performed, and this is output to the monitor 13. Although the reference video signal is processed again after the multi-screen is reproduced here, the control unit 2 stores the control value for the video signal obtained when creating the multi-screen for each video signal. You may make use of this. That is, the control value for the designated reference video signal is retrieved from the control value for each video signal stored in the control unit 2 and reproduced while controlling the gains of the R, G, and B signals based on this. The video signal instructed may be processed.

Next, a method of designating the reference video signal using the small screen display as shown in FIG. 7 according to the sixth embodiment will be described.

First, the operation unit 19 is operated to perform the above-described reproduction processing for each screen, and this is confirmed by the monitor 13. In order to instruct the video signal reproduced at this time as the reference video signal for obtaining the control value, the white balance designating switch provided in the operation unit 19 is operated. When this switch is operated, the control value when the video signal output to the monitor 13 at this time is processed is the hold circuit 16.
Held in. Further, the writing to the memory 18 is performed so that the video signal reproduced at this time is displayed in the small screen shown by A in FIG.

When reproduction of a new video signal is instructed next, the video signal instructed to be reproduced is based on the control value obtained by processing the video signal displayed on the small screen A of FIG. Signal processing is performed and written in the memory 18. Next, a signal is read from the memory 18 and a monitor output is obtained. The reading of the reproduced signal at this time from the memory 18 is controlled so as to be displayed in the area B of FIG. On the monitor screen at this time, the video signal used to obtain the control value is displayed on the small screen A, and the video signal subjected to the white balance control based on the control value obtained from this video signal is displayed on the screen B. Will be.

After that, when the reproduction of a new video signal is instructed, this is displayed on the screen B. Further, when another video signal is designated as a signal for obtaining the control value, this video signal is displayed instead on the small screen A, and the control value is also changed to that obtained from this video signal.

In each of the embodiments described above, the white balance control method uses the integrated value of the color difference signals, but the invention is not limited to this, and R, G, B signals may be used.

The recording medium for the video signal is not limited to the hard disk, but may be a memory card, a magnetic sheet, a magnetic tape, an optical disk or the like.

[0071]

As described above, according to the first aspect of the present invention, when the video signal is reproduced, the white balance control is performed based on the control value obtained from the reference video signal designated at the time of recording. As a result, even when a subject with a large color difference component is reproduced, a subject with a small color difference component, such as a white subject, is photographed under the same color temperature, and this is designated as the reference video signal. As a result, good white balance control can be performed during reproduction, and there is an effect that highly accurate white balance control can be performed on a subject having a large color difference component without losing color vividness. Further, according to the second aspect of the present invention, there is provided means for designating another arbitrary video signal as the reference video signal for obtaining the white balance control value when reproducing the video signal recorded on the recording medium. As a result, it becomes possible to perform satisfactory white balance control even for a video signal for which the white balance control with sufficient accuracy could not be performed by itself. In particular, a colorless object, such as white paper, is shot under the same light source, and this is specified as the reference video signal during playback, and based on this, other video signals shot under the same light source are used. By performing the processing, ideal white balance control can be performed. In addition, in the first and second aspects of the present invention, multi-screen reproduction of the reference video signal and the video signal has an effect of enabling quick search and confirmation of a video signal shot under similar shooting conditions. To be

[Brief description of drawings]

FIG. 1 is a block diagram showing a first embodiment of the present invention.

FIG. 2 is a block diagram showing an embodiment of a camera unit.

FIG. 3 is a configuration diagram showing an array of color filters.

FIG. 4 is a block diagram showing second and fourth embodiments of the present invention.

FIG. 5 is a configuration diagram showing a multi-playback screen according to a third embodiment of the present invention.

FIG. 6 is a configuration diagram showing a multi-playback screen according to a fifth embodiment of the present invention.

FIG. 7 is a configuration diagram showing a multi-playback screen according to a sixth embodiment of the present invention.

[Explanation of symbols]

 1 Hard Disk (HDD) 2 Control Section 6 Color Signal Processing Circuit 7 Variable Gain Amplifier 8 Matrix Circuit 14 Data Detection Section 15 Color Temperature Detection Section 16 Hold Circuit 19 Operation Section

Claims (3)

[Claims] 1. A plurality of video signals are recorded, and designation data that designates a reference video signal that serves as a reference for white balance control, and designation that specifies which reference video signal other video signal uses. A video reproducing apparatus for selectively reproducing a video signal from a recording medium on which data is recorded, the standard video signal or another video signal being detected based on the designated data of the video signal instructed to be reproduced. A detection means, a signal processing means for reproducing the reference video signal detected by the detection means to obtain a white balance control value, and holding the control value, and the other video signal detected by the detection means. A video reproducing apparatus comprising: a control unit that performs white balance control using the held control value when performing reproduction processing. 2. A video reproducing apparatus for selectively reproducing a video signal from a recording medium on which a plurality of video signals are recorded, the standard being for obtaining a control value for white balance control of a video signal instructed to be reproduced. Designation means for designating use as a video signal, signal processing means for reproducing the reference video signal designated by the designation means to obtain the control value and holding the control value, and other means not designated by the designation means. A video reproducing apparatus, comprising: a control unit that performs white balance control using the held control value when the video signal is reproduced. 3. A signal processing means for performing signal processing for displaying the reproduction screen of the reference video signal and the reproduction screen of another video signal using the reference video signal on the same screen. 1. The video reproducing device according to 1 or 2.