JP4661822B2 - Video recording apparatus, video recording method, and recording medium - Google Patents

Description

  The present invention relates to a video recording method, a video recording device, a video recording medium, a video display method, and a video display device, and in particular, faithfully records actual brightness at the time of shooting, and from the recorded recording medium to the time of shooting. The present invention relates to a video recording method, a video recording device, a video recording medium, a video display method, and a video display device that can faithfully represent the actual brightness of the video.

In recent years, the development of information devices has been remarkable, and the demand for high-resolution, low power consumption and thin display devices has been increasing, and research and development have been promoted. Among them, the liquid crystal display device can change the optical characteristics by electrically controlling the alignment of liquid crystal molecules, and is expected as a display device that can meet the above needs. As one form of such a liquid crystal display device, a light valve (such as a liquid crystal light valve) and a dimming element that changes the amount of light incident on the light valve are used, and an image emitted from the optical system is passed through a projection lens. 2. Description of the Related Art Projection-type video display devices (such as liquid crystal projectors) that perform enlarged projection on a screen are known. As a related technique, Patent Document 1 discloses a technique for adjusting the luminance of a light source in a projection-type image display apparatus that projects an enlarged image onto a screen.
Japanese Patent Laid-Open No. 5-066501

  Here, conventionally, when recording a video in a video recording apparatus, for example, by focusing on a range of brightness to be taken by performing shutter speed or aperture, the video is recorded at that brightness. The video display device displays the video according to the recorded video. However, with such a method, it cannot be said that all the brightness information at the time of actual shooting is recorded by the video recording device, so that it is not possible to express the brightness faithful to the brightness at the time of actual shooting. It was.

  The present invention has been made to solve such a problem, and an object of the present invention is to faithfully record the actual brightness at the time of photographing in a projection type video recording apparatus using a light valve and a light control element. Another object of the present invention is to provide a video recording method, a video recording device, a video recording medium, a video display method, and a video display device capable of faithfully expressing actual brightness at the time of shooting from the recorded recording medium.

In order to achieve the above object, the present invention provides a video recording apparatus for recording an image signal on a video recording medium, an image sensor that captures image data from a subject to be photographed, and a photometric element that measures the brightness of a photographing location. And an image data processing unit that generates an image signal based on the image data, and a range of brightness information indicated by the photographing target is narrower than a range of brightness information that the video recording apparatus can record on the video recording medium In such a case, the brightness information range indicated by the shooting target is adjusted so that the range of brightness information that can be recorded by the video recording apparatus on the video recording medium is expanded and stored. Is wider than the range of brightness information that can be recorded on the video recording medium by the video recording device, the video recording device shows the range of brightness information indicated by the subject to be captured. Adjusted to fit narrowed the full range of brightness information that can be recorded, along with changing the image on the light valve according to an input image signal, to the video display device for varying the quantity of light control element that is incident on the light valve When the adjustment is performed to adjust the brightness information range so as to narrow it , the light amount of the light control element is controlled to be large, and the brightness information range is adjusted so as to be expanded and stored. When adjustment is performed, a dimming control signal including a dimming amount for controlling the light amount of the dimming element to be small, and a dimming control signal including brightness information detected from the output of the photometry element A video recording apparatus comprising: a dimming signal generation unit for generating; and synchronization processing means for recording the image signal and the dimming control signal in synchronization with a frame of the image signal. A.
As a result, the actual brightness at the time of shooting can be faithfully adjusted by adjusting the brightness information range indicated by the shooting target so that the image recording apparatus can uniformly fit the entire brightness information range that can be recorded on the video recording medium. Can be recorded.

Further, the present invention is the above-described video recording apparatus, wherein the dimming signal generation unit detects brightness information for each of a plurality of colors from the output of the photometry element, and a dimming control signal for each of the plurality of colors. Is generated.

The present invention is also a video recording method on a video recording medium, which captures image data from a shooting target and separately detects brightness information by measuring the brightness of a shooting location, and based on the image data. If the range of brightness information indicated by the shooting target is narrower than the range of brightness information that can be recorded on the video recording medium by the video recording device, the brightness information indicated by the shooting target is displayed. Is adjusted so that the range of brightness information that can be recorded on the video recording medium by the video recording device is expanded and stored, and the range of brightness information indicated by the subject to be photographed is determined by the video recording device. If the range of brightness information that can be recorded on the video recording device is wider than the range of brightness information that can be recorded on the video recording medium by the video recording device Adjust Mel so, with changing the image on the light valve according to an input image signal, the dimming element is used to change the light amount of the image display device to vary the amount of light incident on the light valve, the brightness In the adjustment of the range of the information, when the adjustment is performed so as to be narrowed, the light amount of the light control element is largely controlled, and in the adjustment of the range of the brightness information, the adjustment is performed so as to expand the range. In this case, a dimming control signal including a dimming amount for controlling the light amount of the dimming element to be small, the dimming control signal including the detected brightness information is generated, and the image signal and the dimming are generated. The video recording method is characterized in that the control signal is recorded in synchronization with the frame of the image signal.

The present invention also relates to a recording medium in which a program to be executed by a computer of a video recording apparatus that records an image signal on a video recording medium is recorded. A photometric process for detecting brightness information by measuring, an image data process for generating an image signal based on the image data, and a range of brightness information indicated by the subject to be photographed are recorded by the video recording device on the video recording medium. If narrower than the range of the brightness information that can be recorded into the range of brightness information indicated by the imaging target, as fit spread across a range of brightness information which can be recorded the video recording apparatus to the image recording medium adjusted, wherein when a range of brightness information which the shooting target is indicated, wider than the range of brightness information which the image recording apparatus can record to the image recording medium, the photographing The range of brightness information indicated by the elephants, adjusted to fit narrowed the full range of brightness information which the image recording apparatus can record to the image recording medium, changes the image on the light valve according to an input image signal At the same time, it is used in an image display device that changes the amount of light incident on the light valve by means of the light control element, and when the adjustment is made so as to narrow it in the adjustment of the range of the brightness information, the light amount of the light control element A dimming control signal including a dimming amount for controlling the light amount of the dimming element to be small when the brightness information range is adjusted to be expanded and stored in the adjustment of the range of the brightness information, A dimming signal generation process for generating a dimming control signal including brightness information detected from the output of the photometric element, and the image signal and the dimming control signal are synchronized with a frame of the image signal. A recording medium for recording a program for executing a synchronization process to a computer to record Te.

  Next, the best mode for carrying out the present invention will be described with reference to the drawings.

[Video recording device]
First, a video recording apparatus according to the present invention will be described.
FIG. 1 is a diagram for explaining a video recording apparatus according to the present invention. In the video recording apparatus 200, when a CCD camera unit 201 captures an image, the brightness (exposure amount) of the shooting location is measured by the photometric element 202. And the “image signal” obtained from the CCD camera unit 201 and the “light control signal” generated based on the measurement data of the photometry element 202 are recorded in the video recording medium 1. The dimming control signal is recorded in synchronization with a frame (image frame) in the image signal. At this time, the range of the brightness information indicated by the object to be photographed is adjusted to information that can be uniformly contained in the entire range of brightness information that the video recording apparatus 200 can record on the video recording medium 1.

  As described above, the image signal and the dimming control signal are recorded in the video recording medium 1 in association with each other in advance, so that the image and the dimming amount become asynchronous when the video display apparatus 100 reproduces the video. The video recording apparatus 200 can record the range of brightness information indicated by the subject to be recorded on the video recording medium 1. By adjusting the brightness information so that it falls within the entire range, the actual brightness at the time of shooting can be recorded faithfully, and when displayed, the actual brightness at the time of shooting can be calculated from the recorded recording medium. Can be expressed faithfully. In addition, the dimming control signal allows the video to be reproduced with the light quantity as intended by the video producer.

  FIG. 2 is a diagram showing a first configuration example of a video recording apparatus according to the present invention. Reference numeral 201 denotes a CCD camera unit, 202 denotes a photometric element, 211 denotes an image data processing unit, and 212 denotes an image data writing unit. Reference numeral 221 denotes a dimming signal generation unit, 222 denotes a dimming signal writing unit, and 231 denotes a synchronization processing unit.

  A CCD camera unit 201 is a video camera for color photography having an optical system and a CCD imaging device, and imaging data photographed by the CCD camera unit 201 is output to an image data processing unit 211. The image data processing unit 211 converts the imaging data received from the CCD camera unit 201 into a digital signal, and performs image data compression processing to create image data.

  The image data writing unit 212 receives the image data j created by the image data processing unit 211, generates an image signal a in a predetermined recording format (for example, MPEG) from the image data j, and outputs a video recording medium. Write to 1.

  On the other hand, the photometric element 202 has a function of monitoring the brightness (exposure amount) around the shooting location photographed by the CCD camera unit 201, and the data measured by the photometric element 202 is the dimming signal generation unit 221. For each color of R (red), G (green), and B (blue) by the R (red) lightness detection unit 221R, the G (green) lightness detection unit 221G, and the B (blue) lightness detection unit 221B. The brightness is detected, and a dimming signal k is generated for controlling the dimming elements (see dimming elements 13R, 13G, and 13B shown in FIG. 2) in the video display device for each color. At this time, the dimming signal generation unit 221 adjusts the detected brightness information of each RGB so that the image recording apparatus can uniformly fit the entire range of brightness information that can be recorded on the image recording medium. The dimming signal k including the depth information is generated. For example, the dimming signal generation unit 221 determines that the image is relatively dark when the shutter speed is slow, or determines that the image is relatively bright when the aperture value is high, and detects the brightness of each detected RGB. The information is adjusted so that the video recording apparatus uniformly fits within the entire range of brightness information that can be recorded on the video recording medium.

  The dimming signal k generated by the dimming signal generation unit 221 is output to the dimming signal writing unit 222. The dimming signal writing unit 222 generates a dimming control signal b based on the dimming signal k input from the dimming signal generation unit 221 and writes it to the video recording medium 1. The dimming control signal b includes white balance information.

FIG. 3 is an explanatory diagram regarding adjustment of brightness information.
As shown in (a), in the case where the brightness of the photographing target indicates dark brightness information of about 0 to 128 out of the brightness information range of 0 to 255, the video recording device displays the video. Adjustment is performed so that the entire range (0 to 255) of brightness information (gradation or latitude) that can be recorded on the recording medium is uniformly contained. When the video display device displays video using the video recording medium recorded as shown in (a), the light amount is reduced in the light control element of the video display device.
Further, as shown in (b), even when the brightness of the subject to be photographed indicates brightness information that is somewhat brighter, the range of brightness information that can be recorded on the video recording medium by the video recording device (gradation or gradation). Latitude) is adjusted so that it is uniformly contained in the whole (0 to 255). When the video display device displays video using the video recording medium recorded as shown in (b), the light amount is increased in the light control element of the video display device.

  The synchronization processing unit 231 generates a synchronization signal m based on the image data j and the dimming signal k. The synchronization signal m is sent to the image data writing unit 212 and the dimming signal writing unit 222, and the dimming control signal b is written to the video recording medium 1 in synchronism with the image signal a.

  Note that writing of the dimming control signal b to the video recording medium 1 is usually performed for each of R (red), G (green), and B (blue), or a dimming common to each color as necessary. The light control signal b may be written.

  The contents of the dimming control signal recorded in the video recording medium 1 include various information such as information on the light control amount (reduced light amount), information on the screen brightness, and information on the exposure amount at the time of shooting. Can be used. That is, the dimming control signal b may be information that can appropriately control the dimming amount of the dimming elements 13R, 13G, and 13B on the video display device 100 side according to the image.

  In the video recording apparatus 200a, the dimming signal may be obtained directly from the image data without using the photometric element 202. For example, the dimming signal generation unit 221 in the video recording apparatus 200 acquires the image data j from the image data processing unit 211, and uses the brightness gradation (for example, the maximum value or the average value) in the image data. , A dimming signal k is generated. At this time, the dimming signal generation unit 221 arranges the detected brightness information of each RGB uniformly in the entire range of brightness information that can be recorded on the video recording medium by the video recording apparatus, and includes the dimming information including the information. An optical signal k is generated. In addition, the dimming signal writing unit 222 generates a dimming control signal b based on the dimming signal k and writes it to the video recording medium 1.

  In this example, the photometric element 202 can be omitted, and the dimming control signal b can be generated based on the image data j and recorded on the video recording medium 1.

[Video display device]
Next, a video display device according to the present invention will be described.
FIG. 4 is a schematic configuration diagram of a display unit of a projection-type image display apparatus to which the present invention is applied, in which transmissive lights are provided for different colors of R (red), G (green), and B (blue). It is an example of a three-plate projection type color image display device provided with a valve (liquid crystal light valve or the like). In the figure, 10R, 10G, and 10B are light sources, 13R, 13G, and 13B are light control elements, 20R, 20G, and 20B are light valves (liquid crystal light valves, etc.), 30 is a cross dichroic prism, 40 is a projection lens, and 41 is Shows the screen.

  The light sources 10R, 10G, and 10B are color light sources that can emit red light, green light, and blue light, respectively. The light sources 10R, 10G, and 10B are light emitting diodes (LEDs), organic electroluminescence elements (organic EL elements), and inorganic light sources. A light emitter 11 such as an electroluminescence element (inorganic EL element) and a reflector 12 that reflects the output light of the light emitter 11 are configured. The light valves 20R, 20G, and 20B are provided corresponding to the light sources 10R, 10G, and 10B, respectively, and light modulation is possible for each light source.

  In addition, the light control elements 13R, 13G, and 13B are roughly configured by polarizing plates that are sandwiched on both sides of the liquid crystal panel with a liquid crystal layer sandwiched between a pair of glass substrates (light transmissive substrates). As the liquid crystal sandwiched between the pair of glass substrates, a liquid crystal with a high response speed such as FLC is used.

  When the dimming elements 13R, 13G, and 13B receive a drive signal from the dimming element driver and apply a voltage to the light transmissive electrode, the transmittance is changed by changing the time distribution between non-voltage application and voltage application between frames. The time distribution of 100% and transmittance 0% can be freely changed, and the light control elements 13R, 13G, and 13B can be changed by changing the time distribution of transmittance 100% and transmittance 0% in this way. The amount of light emitted from one frame to the next can be changed. For a bright screen, the amount of light between one frame can be increased by increasing the time distribution of 100% transmittance in one frame and decreasing the time distribution of 0% transmittance. To be more.

  In the case of a dark screen, the amount of light emitted from the light emitter 11 is reduced by reducing the time distribution of 100% transmittance in one frame and increasing the time distribution of 0% transmittance to reduce the amount of light. The amount of light emitted between frames (the amount of light emitted from the light emitter 11 during one frame) is adjusted by the light control elements 13R, 13G, and 13B.

  Further, the cross dichroic prism 30 has a structure in which four right-angle prisms are bonded together, and light reflection films (not shown) made of a dielectric multilayer film are formed in a cross shape on the bonding surfaces 30a and 30b. . Specifically, a light reflecting film that reflects red image light formed by the light valve 20R and transmits green and blue image light formed by the light valves 20G and 20B is provided on the bonding surface 30a. It has been. On the other hand, a light reflecting film that reflects blue image light formed by the light valve 20B and transmits red and green image light formed by the light valves 20R and 20G is provided on the bonding surface 30b. . Then, by these light reflecting films, the image lights of the respective colors formed by the light valves 20R to 20B are combined to form light representing a color image. The synthesized light is projected on the screen 41 by the projection lens 40 which is a projection optical system, and an enlarged image is displayed.

Next, a circuit configuration example of the video display device according to the present invention will be described.
FIG. 5 is a diagram showing a first configuration example of a video display device according to the present invention. Reference numeral 1 denotes a video recording medium (such as a CD-ROM or DVD-ROM) on which an image signal and a dimming control signal are recorded. Is a video display device, 101 is a recording medium reading unit that reads “image signal” and “dimming control signal” recorded on the video recording medium, 102 is an image processing unit that performs image signal expansion processing, and 103 is a light valve. , 110 is a dimming signal processing unit for generating a signal for driving the dimming element driver based on the dimming control signal and the white balance information included in the dimming control signal, and 111 is the dimming element Shows the driver. The light valve driver 103 and the dimming element driver 111 have a function of driving (driving) for different colors of R (red), G (green), and B (blue).

  A video recording medium 1 such as a DVD-ROM or a CD-ROM is inserted into a recording medium reading unit 101, and an “image signal” and a “dimming control signal (recorded) recorded on the video recording medium 1 by the recording medium reading unit 101. The signal is synchronized with the frame of the image signal). As the dimming control signal, normally, dimming amount control information is recorded for each color of R (red), G (green), and B (blue), but R (red), It is also possible to record control information of the light control amount common to G (green) and B (blue).

  The image signal a and the dimming control signal b read by the recording medium reading unit 101 are output to the image processing unit 102. The dimming control signal b is also output to the dimming signal processing unit 110. In the image processing unit 102, image processing such as expansion processing for setting the expansion amount of the video signal of each color is performed on the image signal a input from the recording medium reading unit 101, and the modulated image signal c is converted into a light valve driver. To 103. At this time, information indicating the brightness obtained from the dimming signal b is also output to the light valve driver 103. The light valve driver 103 generates a light valve drive signal d based on the “modulated image signal c” input from the image processing unit 102 and information indicating brightness, and drives the light valves 20R, 20G, and 20B. To do. At this time, the light valves 20R, 20G, and 20B are controlled by the light valve driver 103 so that the dynamic range of the light valve is used in the full range.

  The dimming signal processing unit 110 generates and outputs a dimming element control signal e for driving the dimming element driver 111 based on the dimming control signal b input from the recording medium reading unit 101.

  The dimming element driver 111 generates the dimming element driving signal f based on the dimming element control signal e input from the dimming signal processing unit 110, drives the dimming elements 13R, 13G, and 13B, and the light valve. The amount of light incident on 20R, 20G, and 20B is controlled. At this time, when white balance information is included in the dimming control signal b, the light valve displays the full range, so that the dimming signal processing unit 110 individually dims the dimming element, so that the optimal white Balance can be reproduced.

  The dimming signal processing unit 110 of the video display device may add the characteristics of the video display device to the dimming control signal. For example, in the case of an image display device that does not have a large dynamic range but is capable of outputting a sufficiently bright image, the dimming signal processing unit 110 displays display characteristics for the dimming control signal (the brightness included in the dimming control signal). Information (coefficient corresponding to luminance, illuminance, and contrast ratio)) and the display characteristic coefficient (coefficient> 1) is multiplied. As a result, the amount of illumination light can be largely controlled, and brightness close to that of the original subject can be reproduced. On the other hand, if the video display device cannot output sufficient brightness, it is multiplied by a coefficient (coefficient <1) corresponding to the display characteristics for the dimming control signal. Thereby, the control of the amount of illumination light can be made small and the brightness close | similar to the original imaging | photography object can be expressed. Also, if you know the photometric value of the captured image, check the dimming control signal and control the dimming element so that the brightness obtained from the photometric value is reproduced by comparing with the characteristics of the display device. Can do. For example, consider a case where the display device has a characteristic of 1000 lm when displaying all white. If the photometric value (here, maximum illuminance) of the photographed image is 500 lm, the image having the same maximum illuminance as that at the time of photographing can be reproduced by halving the illumination light quantity.

The contents of the dimming control signal recorded on the video recording medium 1 are, for example, information on dimming amount (reduced light amount), information on screen brightness, and exposure amount at the time of shooting (shutter speed, aperture, imaging) Various information can be used, such as information (determined by the environment at the time of shooting, such as element sensitivity).
That is, the dimming control signal b may be information that can appropriately control the dimming amount of the dimming elements 13R, 13G, and 13B on the video display device 100 side according to the image.

As described above, in the video display device of the present invention, when the image signal recorded on the video recording medium is reproduced, the dimming control signal recorded in advance corresponding to the image signal is simultaneously read and the dimming control signal is read. Thus, the light control amount is appropriately controlled in synchronization with the image to be reproduced. As a result, when the image signal is reproduced by the image display device, it is possible to prevent the image to be reproduced and the dimming amount from becoming asynchronous, and it is possible to prevent the image from being “white crushed” or “flickering”.
The dynamic range is used when the light valve driver 103 controls the light valve, and the dimming element driver 111 receives the dimming element control signal from the dimming signal processing unit 110 to control the dimming element. . At this time, since the dimming control signal is matched with the display characteristics of the video display device, a further brightness reproduction effect can be expected in consideration of the difference in the display characteristics of the video display device.

  Although the embodiments of the present invention have been described above, each processing unit in the video recording apparatus shown in FIGS. 1 and 2 and each processing unit in the video display apparatus shown in FIGS. The function may be achieved by software, and a program for realizing the function of each processing unit is recorded on a computer-readable recording medium, and the program recorded on the recording medium is read into a computer system. , The processing necessary for each processing unit in the video display device shown in FIGS. 1 and 2 and each processing unit in the video recording device shown in FIGS. 4 and 5 may be performed. Here, the “computer system” includes an OS and hardware such as peripheral devices.

The “computer-readable recording medium” refers to a storage device such as a flexible medium, a magneto-optical disk, a portable medium such as a ROM and a CD-ROM, and a hard disk incorporated in a computer system. Furthermore, the “computer-readable recording medium” dynamically holds a program for a short time like a communication line when transmitting a program via a network such as the Internet or a communication line such as a telephone line. It also includes a device (transmission medium or transmission wave) and a device that holds a program for a certain period of time, such as a volatile memory inside a computer system serving as a server or client in that case.
The program may be for realizing a part of the functions described above, and further, a program that can realize the functions described above in combination with a program already recorded in a computer system, a so-called difference file (difference). Program).

  Although the embodiment of the present invention has been described above, the video display device and the video recording device of the present invention are not limited to the above illustrated examples, and various modifications can be made without departing from the gist of the present invention. Of course, can be added.

The figure for demonstrating a video recording device. The figure which shows the 1st structural example of a video recording device. It is a figure for description regarding adjustment of brightness information. The schematic block diagram of the display part of a projection type video display apparatus. The figure which shows the structural example of a video display apparatus.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 1 ... Video recording medium, 10R, 10G, 10B ... Light source, 11 ... Luminescent body, 13R, 13G, 13B ... Light control element, 20R, 20G, 20B ... Light valve, 100 ... Video display apparatus, 101 ... Recording medium reading , 102 ... Image processing unit, 103 ... Light valve driver, 110 ... Dimming signal processing unit, 111 ... Dimming element driver, 200 ... Video recording device, 201 ... CCD camera unit, 202 ... Photometric element, 211 ... Image data Processing unit 212 ... Image data writing unit, 221 ... Dimming signal generation unit, 221B ... B (blue) lightness detection unit, 221G ... G (green) lightness detection unit, 221R ... R (red) lightness detection unit, 222 ... Dimming signal writing unit, 231 ... Synchronization processing unit

Claims (4)

A video recording apparatus for recording an image signal on a video recording medium,
An image sensor that captures image data from a subject,
A photometric element that measures the brightness of the shooting location;
An image data processing unit for generating an image signal based on the image data;
When the range of brightness information indicated by the shooting target is narrower than the range of brightness information that can be recorded on the video recording medium by the video recording device, the range of brightness information indicated by the shooting target is set as the video recording device. Is adjusted so as to expand to the entire range of brightness information that can be recorded on the video recording medium,
When the range of brightness information indicated by the shooting target is wider than the range of brightness information that can be recorded on the video recording medium by the video recording device, the range of brightness information indicated by the shooting target is set as the video recording device. Is adjusted so as to be narrowed within the entire range of brightness information that can be recorded on the video recording medium,
It is used in an image display device that changes the image on the light valve in accordance with the input image signal and changes the amount of light incident on the light valve by the dimming element, so that it is narrowed in the adjustment of the range of the brightness information. When the adjustment is performed, the light amount of the dimming element is controlled to be large, and when the adjustment is made so that the brightness information range is expanded, the light amount of the dimming element is controlled to be small. A dimming control signal including a dimming light amount, and a dimming signal generation unit for generating a dimming control signal including brightness information detected from the output of the photometric element;
Synchronization processing means for recording the image signal and the dimming control signal in synchronization with a frame of the image signal;
A video recording apparatus comprising: The video recording apparatus according to claim 1,
The video dimming device, wherein the dimming signal generation unit detects brightness information for each of a plurality of colors from an output of the photometric element, and generates a dimming control signal for each of the plurality of colors. A method of recording video on a video recording medium,
In addition to capturing image data from the shooting target, separately detecting brightness information by measuring the brightness of the shooting location,
Generating an image signal based on the image data;
When the range of brightness information indicated by the shooting target is narrower than the range of brightness information that can be recorded on the video recording medium by the video recording device, the range of brightness information indicated by the shooting target is set as the video recording device. Is adjusted so as to expand to the entire range of brightness information that can be recorded on the video recording medium,
When the range of brightness information indicated by the shooting target is wider than the range of brightness information that the video recording device can record on the video recording medium, the video recording device displays the range of brightness information indicated by the shooting target. Adjust to narrow the entire range of brightness information that can be recorded on the video recording medium,
In the adjustment of the range of the brightness information, the image on the light valve is changed in accordance with the input image signal, and the light amount of the image display device that changes the light amount incident on the light valve by the dimming element is used. When the adjustment is performed so as to be narrowed, the light amount of the light control element is largely controlled, and when the adjustment is performed so as to expand the light information in the adjustment of the range of the brightness information, the light control element A dimming control signal including a dimming amount for controlling the light amount of the light, and generating a dimming control signal including the detected brightness information,
The video recording method, wherein the image signal and the dimming control signal are recorded in synchronization with a frame of the image signal. A recording medium recording a program to be executed by a computer of a video recording apparatus for recording an image signal on a video recording medium,
An imaging process that captures image data from the subject,
A photometric process that detects brightness information by measuring the brightness of the shooting location;
Image data processing for generating an image signal based on the image data;
When the range of brightness information indicated by the shooting target is narrower than the range of brightness information that can be recorded on the video recording medium by the video recording device, the range of brightness information indicated by the shooting target is set as the video recording device. Is adjusted so as to expand to the entire range of brightness information that can be recorded on the video recording medium ,
When the range of brightness information indicated by the shooting target is wider than the range of brightness information that can be recorded on the video recording medium by the video recording device, the range of brightness information indicated by the shooting target is set as the video recording device. Is adjusted so as to be narrowed within the entire range of brightness information that can be recorded on the video recording medium,
It is used in an image display device that changes the image on the light valve in accordance with the input image signal and changes the amount of light incident on the light valve by the dimming element, so that it is narrowed in the adjustment of the range of the brightness information. When the adjustment is performed, the light amount of the dimming element is controlled to be large, and when the adjustment is made so that the brightness information range is expanded, the light amount of the dimming element is controlled to be small. A dimming control signal including a dimming light amount, and a dimming signal generation process for generating a dimming control signal including brightness information detected from the output of the photometric element;
A synchronization process for recording the image signal and the dimming control signal in synchronization with a frame of the image signal;
A recording medium on which a program for causing a computer to execute is recorded.

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