JP2010263643A - Image display device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To display an image based on a display characteristic closer to a display characteristic of a cinema projector when a film image signal generated based on a cinema film or an image signal equivalent to the film image signal is input as an image signal. <P>SOLUTION: An image insertion unit 13 for inserting an interpolation frame image in the input image signal, and a display panel 14 for displaying the image based on the image signal in which the interpolation frame image is inserted are provided. The image insertion unit 13 inserts an image with an insertion period and signal level optimized based on the display characteristic when the cinema film is projected by the cinema projector, into a portion in an input image signal Vin corresponding to a part between frames of the cinema film, as the interpolation frame image. Specifically, an image with the insertion period and the signal level optimized so as to reproduce the display characteristic in a shutter period between frames when the cinema film, is projected by the cinema projector is inserted as the interpolation frame image. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to an image display apparatus to which a film image signal generated based on a movie film is input as a video signal.

  Generally, in movie shooting, 24 frames of still images are recorded on a movie film per second. In a movie theater, a movie is displayed by continuously projecting the movie film at a rate of 24 frames per second by a projector. That is, a moving image is displayed at a frame rate of 24 frames / second (24 Hz).

  On the other hand, the frame rate of a normal TV (television) signal is 50 frames / second (50 Hz) or 60 frames / second (60 Hz). For this reason, conventionally, for example, a process called TV cinema conversion (telecine conversion) for converting a film image signal of 24 frames / second into a signal format of a normal TV signal has been performed. Examples of telecine conversion include 2-2 pull-down and 2-3 pull-down. For example, in the case of converting a film image signal of 24 frames / second into an image signal of 60 frames / second, 2-3 pull-down is used. For example, assume that the first frame image in the film image is A, and the next second frame image is B. In 2-3 pull-down, the sequence of images AB in the film image is converted into a sequence of images AABBB in a 60-frame image. In other words, an image for two frames is generated from the first frame image of the film image, and an image for three frames is generated from the next second frame image, thereby generating an image of five frames from the two frame images. To do. By converting this for 24 frames, an image of 60 frames is generated, so that it becomes a signal format of 60 frames / second by putting it in a display period of 1 second. Similarly, in the 2-2 pull-down, a process for converting the sequence of images AB in the film image into a sequence of images AABB is performed. In other words, in the 2-2 pull-down, an image for two frames is sequentially generated from each frame image of the film image.

  Since the signal subjected to the pull-down process has a characteristic in the image arrangement, the device that reproduces the video detects the arrangement of the image, and the input video signal is generated based on the movie film. A film image signal can be detected. This is a technique called film detection, which has been conventionally known (see Patent Document 3).

  A video signal input to a TV receiver or the like is converted into a TV signal of 50 Hz or 60 Hz when it is transmitted from a broadcast station or transmitted from a video player even if the original video is a movie film image. It is output.

  On the other hand, recently, the viewing environment for movie content in ordinary households is becoming more similar to movie film screening in movie theaters. For example, with regard to the size and definition of the screen, large, horizontally long and high-definition TV displays have become popular in ordinary households. Further, as a display method of the TV display, a liquid crystal display method is widely used instead of the CRT (cathode ray tube) method. As a result, display in the progressive method has been performed instead of the interlace scan method used in the conventional CRT. Therefore, recently, a TV receiver or the like can display a film image signal of 24 frames / second at the same frame rate even if the input video signal is not converted to a 50 Hz or 60 Hz TV signal. It has become to. Such a display method is called 24p playback. The 24p playback is performed when, for example, a 1080p24 signal with HDMI (High Definition Multimedia Interface) input is input.

  In this way, recently, it has become possible to display a large screen, high definition, and the same frame rate as a movie film on a liquid crystal TV or the like, and it is easy to make the viewing environment similar to movie film screening in a movie theater. It has become to. On the other hand, panel devices such as LCD TVs are so-called hold-type displays, so judder is particularly noticeable in video at 24 frames / second, especially in movie content, and the degree of discomfort increases as the screen size increases. Easy to feel. In the hold-type display, an image once displayed is displayed so as to continue displaying the same image until the next image display time. That is, when there is no change in video between frames, data refresh is not performed and the same video is continuously output. For this reason, when the subject is moving due to the switching of frames, the subject appears to be doubled due to human visual characteristics. This is a phenomenon called judder.

Japanese Patent No. 3788394 Japanese Patent No. 3385530 JP-A-2005-130286

  By the way, in the projector, at the moment when any one frame of the film is projected, the frame stops at a predetermined position of the projector and is projected. In order to switch to the next frame, it is necessary to perform film advance (frame advance). During the film feeding, the light from the projection lamp is blocked by the rotating shutter, and there is a state where nothing is projected on the screen for a moment. When the next frame of the film is fed to a predetermined position of the projector and completely switched, the rotary shutter is opened and the frame is projected on the screen. Thus, in the projector, the motion of the movie film stopping or being sent for each frame is quickly repeated. In addition, the interval between frames (the moment of film feeding) is a shutter period by a rotary shutter, and a black screen is instantaneously displayed. Although judder occurs in movie film screenings in movie theaters, due to the principle of film screening as described above, when the shutter is released between frames, the screen instantaneously becomes a black screen. The

Therefore, even in a hold-type display such as a liquid crystal TV, a method of suppressing the influence of judder by alternately displaying a real screen and a black screen one frame at a time can be considered. However, simply displaying a real screen and a black screen alternately one frame at a time,
1) The brightness of the video is greatly reduced. 2) There is a problem that the judder looks different from the video viewed in a movie theater. Patent Documents 1 and 2 disclose a driving method in which a data screen and a black screen are alternately displayed in order to reduce an afterimage feeling generated in a liquid crystal display device. However, the display does not take into consideration the display characteristics (light emission characteristics) when a movie film is projected by a projector. For this reason, there is a problem that, when a moving image based on a film image signal is displayed, the appearance looks different from the case of performing projection using a projector.

  The present invention has been made in view of such problems, and its purpose is to display a video when a film image signal generated based on a movie film or an image signal equivalent thereto is input as a video signal. An object of the present invention is to provide an image display device that can be brought close to display characteristics of a projector.

  The image display device according to the present invention can input an input video signal when the input video signal is a film image signal generated based on a movie film or an image signal equivalent to a film image signal obtained by photographing with a digital photographing device. An image insertion unit that inserts an interpolation frame image into the video signal, and a display unit that displays video based on the video signal with the interpolation frame image inserted therein are provided. The image insertion unit is optimally lower than the signal level of the image immediately before the interpolation frame image is inserted so as to reproduce the display characteristics in the shutter period between the frames when the movie film is projected by the projector. The converted image is inserted as an interpolated frame image into a portion corresponding to each frame of the motion picture film in the input video signal.

  Here, in the present invention, the “film image signal” is not limited to a film image signal having a signal format of, for example, 24 frames per second, that is, a film image signal having a frame rate of 24 Hz. For example, it may be a video signal generated by pulling down a 24 Hz film image signal. For example, it may be a video signal obtained by converting a film image signal having a frame rate of 24 Hz to a frame rate of 60 Hz by 2-3 pulldown.

  In the image display device of the present invention, when the input video signal is a film image signal generated based on a movie film or an image signal equivalent to a film image signal obtained by photographing with a digital photographing device, An interpolated frame image is inserted into the video signal. As the interpolated frame image, an image in which the insertion period and the signal level are optimized based on display characteristics when a movie film is projected by a projector is inserted. The interpolated frame image is inserted in a portion corresponding to each frame of the movie film in the input video signal.

  More specifically, the signal level is optimized to be lower than the signal level of the image immediately before the interpolation frame image is inserted so as to reproduce the display characteristics in the shutter period between the frames when the movie film is projected by the projector. The obtained image is inserted as an interpolated frame image.

Further, for example, the interpolation frame image insertion period may be optimized so as to be the same as the shutter period between the frames when the movie film is projected by the projector.
In this case, since the signal level of the interpolated frame image is optimized so as to be lower than the signal level of the image immediately before the interpolated frame image is inserted, display is performed in consideration of human visual characteristics, and the viewer can This makes it easier to get the impression you received when filmed on a projector. In addition, since it is relatively easy to change the signal level compared to changing the insertion period, for example, it is possible to change the display of the interpolated frame image according to the viewing environment. Thus, for example, even when a video is displayed in a general home where the viewing environment is brighter than that of a movie theater, the impression received by the viewer can be easily approached when the film is screened by a projector.

  According to the image display device of the present invention, when the input video signal is a film image signal generated based on a movie film or an image signal equivalent to a film image signal obtained by photographing with a digital photographing device. The interpolated frame image is inserted into the portion corresponding to each frame of the movie film. Then, as the interpolated frame image, an image in which the insertion period and the signal level are optimized based on the display characteristics when the movie film is projected by the projector is inserted. Thus, when a film image signal generated based on a movie film is input as a video signal, the video display can be brought close to the display characteristics of the projector.

1 is a block diagram illustrating an example of an overall configuration of an image display device according to a first embodiment of the present invention. It is a wave form diagram which shows an example of the image output waveform of a projector. It is a wave form diagram which shows typically the display characteristic of a projector when a human visual characteristic is considered. It is a wave form diagram which shows the signal output waveform in the image display apparatus which concerns on the 1st Embodiment of this invention. It is a wave form diagram which shows the signal output waveform in the image display apparatus which concerns on the 2nd Embodiment of this invention. It is explanatory drawing which shows the frame structure of the film image signal by which 2-3 pulldown was carried out. It is explanatory drawing which shows a frame structure when the frame rate of the film image signal pulled down 2-3 was doubled by the normal process. It is explanatory drawing which shows a frame structure when the frame rate of the film image signal pulled down 2-3 is doubled so that it may become close to the display characteristic by a projector easily.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

<First Embodiment>
[Configuration of image display device]
FIG. 1 shows an example of the entire configuration of an image display apparatus according to the first embodiment of the present invention. The image display device includes an image processing unit 11 that performs predetermined image processing on an input video signal Vin, and a film signal detection unit 12 that detects whether the input video signal Vin is a film image signal. Yes. The image display device also includes an image insertion unit 13 that performs processing for inserting an interpolation frame image when the input video signal Vin is a film image signal, and a video based on the video signal output from the image insertion unit 13. And a display panel 14 for performing display. The image display device also includes an MPU (Micro Processor Unit) 15 connected to and communicating with the image processing unit 11, the film signal detection unit 12, and the image insertion unit 13.

  The display panel 14 is a hold-type display panel, for example, a liquid crystal display panel. In the present embodiment, the display panel 14 corresponds to a specific example of “display unit” in the present invention.

  Here, in the present embodiment, the “film image signal” refers to all signals generated based on a movie film, and the signal format is, for example, a film image of 24 frames per second, that is, a film having a frame rate of 24 Hz. It is not limited to an image signal. For example, it may be a video signal obtained by converting a frame image signal of 24 Hz by 2-2 pulldown.

  As described above, a signal subjected to 2-2 pull-down or 2-3 pull-down has a characteristic in the image arrangement, and the input video signal Vin is generated based on the movie film by detecting the characteristic of the image arrangement. It is possible to detect that the film image signal has been processed. This film detection method is conventionally known. The film signal detection unit 12 detects whether or not the input video signal Vin is a signal subjected to pull-down processing by such a film detection method. The detection result in the film signal detection unit 12 is notified to the image insertion unit 13. In addition, a film image signal with a frame rate of 24 Hz may be input as the input video signal Vin, for example, a 1080p24 signal with HDMI input. The MPU 15 has a function of detecting the signal format of the input video signal Vin, detects that a film image signal with such HDMI input has been input, and notifies the image insertion unit 13 of it.

  The image insertion unit 13 performs a process of inserting an interpolated frame image into the input video signal Vin when the film signal detection unit 12 or the MPU 15 detects that the film image signal is input as the input video signal Vin. It has become. The image insertion unit 13 inserts an interpolated frame image at a portion corresponding to each frame of the motion picture film in the input video signal Vin. Further, the image insertion unit 13 inserts an image in which the insertion period and the signal level are optimized based on display characteristics when a movie film is projected by a projector as an interpolated frame image.

[Operation of image display device]
Next, the operation of the image display apparatus according to this embodiment will be described.
In this image display device, the input video signal Vin is input to the film signal detection unit 12 via the image processing unit 11. The film signal detection unit 12 detects whether or not the input video signal Vin is a signal subjected to pull-down processing, and outputs the result to the image insertion unit 13 together with the input video signal Vin. The MPU 15 also detects the signal format of the input video signal Vin, detects that a film image signal such as 1080p24 has been input, and notifies the image insertion unit 13 of it. When the input video signal Vin is a film image signal, the image insertion unit 13 performs a process of inserting an interpolation frame image and outputs it to the display panel 14. If the input video signal Vin is not a film image signal, the input video signal Vin is output to the display panel 14 without performing the process of inserting the interpolation frame image. The display panel 14 performs video display based on the video signal output from the image insertion unit 13.

The interpolation frame image insertion process performed by the image insertion unit 13 will be specifically described below. FIG. 2 shows an example of an output waveform when a movie film is projected by a projector. In FIG. 2, the horizontal axis represents time, and the vertical axis represents the video display state (corresponding to the signal level). Here, for the sake of simplicity, the video display of the movie film is in an on state (for example, a state corresponding to the white level of the signal level) and the video display is in an off state (a state in which the signal level corresponds to the black level). There are two states. In FIG. 2, TW0 corresponds to one frame period of a movie film. For example, if the film format is 24 frames / second (24 Hz),
TW0 = 1/24 seconds (24 Hz)
It is. In the projector, the interval between frames (the moment of film feeding) is a shutter period by a rotary shutter, and a black screen is instantaneously displayed. TW1 indicates the shutter period. TW2 is a period obtained by subtracting the shutter period TW1 from the period TW0, and is an image display period in which an image is actually displayed on the screen. The shutter period TW1 is, for example, 1/96 second (96 Hz).

  In the projection by the projector, there is such a shutter period TW1, and when the shutter is released between frames, the screen instantaneously becomes a black screen, so the uncomfortable feeling due to judder is considerably reduced. Therefore, the image insertion unit 13 may generate and insert an interpolation frame image that reproduces the display characteristics of the shutter period TW1, for example. That is, it is only necessary to generate and insert an interpolated frame image in which the signal level is the black level and the insertion period (frame period) is the same as the shutter period TW1. In this case, if the shutter period TW1 is 1/96 seconds, a circuit having a signal processing capability of 96 Hz or more may be used as the image insertion unit 13.

  By the way, human visual characteristics are not considered in the output waveform shown in FIG. FIG. 3 schematically shows the display characteristics of the projector when human visual characteristics are taken into consideration. Here, in FIG. 2 and FIG. 3, the shutter period TW1 starting from time t2 and ending at time t3 will be considered. Since the human eye has afterimage characteristics, even if the rotary shutter is released at time t2, the stimulus received by the human eye may immediately drop from the white level to the black level at time t2 as shown in FIG. Instead, as shown in FIG. 3, the signal level is gradually lowered. Further, since there is a slight time lag before the rotary shutter starts to fully open at time t3, a stimulus is given such that the signal level gradually increases around time t3. Therefore, in consideration of visual characteristics, the portion indicated by the region 21 is a region that is not recognized as an image by the human eye. In order to reproduce an appearance similar to that in an actual movie theater, it is preferable to realize a video waveform as shown in FIG. 3 in consideration of visual characteristics.

  However, it is difficult to completely reproduce a video waveform having an oblique signal waveform as shown in FIG. 3 by inserting an interpolation frame image. Therefore, the video waveform shown in FIG. 4 may be reproduced instead of the video waveform shown in FIG. 2 to 4, the scale of each axis is the same. That is, in the image insertion unit 13, the signal level is set to the black level, and an image optimized so that the insertion period is a period TW3 shorter than the shutter period TW1 is inserted as an interpolated frame image. good. In FIG. 4, TW4 is a period obtained by subtracting the interpolated frame image insertion period TW3 from the period TW0, and is an image display period in which the original film image image is actually displayed on the display panel 14. Assuming that the shutter period TW1 shown in FIGS. 2 and 3 is 1/96 second (96 Hz), the optimized insertion period TW3 in FIG. 4 is, for example, 1/192 second (192 Hz), which is a double speed of the period TW1. ). Therefore, in order to realize the signal waveform as shown in FIG. 4, a circuit having a signal processing capability of 192 Hz or more may be used as the image insertion unit 13.

  As described above, according to the image display apparatus according to the present embodiment, when the input video signal Vin is a film image signal, the interpolated frame image is inserted into a portion corresponding to each frame of the movie film. I made it. As the interpolated frame image, an image in which the insertion period and the signal level are optimized based on the display characteristics of the projector is inserted. Thus, when a film image signal is input as the video signal Vin, the video display can be brought close to the display characteristics of the projector.

  In addition, by using the image display device according to this embodiment as a television receiver used at home or the like, the viewer's impression received when watching television images at home or the like is screened in a movie theater. It is possible to get close to the impression that viewers receive when watching the video. As a result, it is possible to realize viewing with a sense of presence similar to when viewing at a movie theater. In addition, as a technique for detecting a film image signal and a video technique for inserting an interpolated frame image used in the image display apparatus according to the present embodiment, a technique generally used in the past can be applied. . That is, the circuit configuration itself in the image display apparatus according to the present embodiment can be realized by using a combination of commonly used technologies, and the circuit scale can be significantly increased compared to the conventional one. It is feasible without.

<Second Embodiment>
Next, an image display apparatus according to a second embodiment of the present invention will be described. Note that components that are substantially the same as those of the image display apparatus according to the first embodiment are denoted by the same reference numerals, and description thereof is omitted as appropriate.

  The basic circuit configuration of the image display apparatus according to the present embodiment is the same as that in FIG. 1, but the interpolation frame image generated by the image insertion unit 13 is different. In the first embodiment, the display characteristics (FIG. 3) of the projector taking the visual characteristics into consideration are realized by inserting a black level interpolation frame image. At that time, the insertion period (frame period of the interpolated frame image) is optimized to be a period TW3 shorter than the shutter period TW1 (FIG. 4). However, in order to realize the technique shown in FIG. 4, a circuit having a high processing capability of, for example, 192 Hz or more is required as a circuit configuration. In the present embodiment, it is possible to realize display characteristics of a projector considering visual characteristics at low cost without using a circuit having such high processing capability.

  FIG. 5 shows a signal waveform generated when the input video signal Vin is a film image signal in the image display apparatus according to the present embodiment. Note that the scale of each axis in FIG. 5 is the same as in FIGS. In the present embodiment, the image insertion unit 13 inserts, as an interpolation frame image, an image optimized so that the signal level is lower than the signal level of the image immediately before the interpolation frame image is inserted. The insertion period is optimized to be the same as the shutter period TW1. For example, as shown in FIG. 5, if the signal level of the image immediately before inserting the interpolated frame image is A, α times (α is a coefficient smaller than 1), the signal level A × α. The signal is inserted as an interpolated frame image. By inserting a signal having such a signal level, even if the insertion period is the same as that of the shutter period TW1, it is possible to obtain display characteristics equivalent to the display characteristics (FIG. 3) of the projector considering the visual characteristics. In this case, if the shutter period TW1 is 1/96 seconds, a circuit having a signal processing capability of 96 Hz or more may be used as the image insertion unit 13. That is, the circuit can be realized with a circuit having a low signal processing capability as compared with the case where the insertion period is optimized to be a period TW3 shorter than the shutter period T1 as in the first embodiment.

By the way, there are particularly significant differences between the viewing environment in an actual movie theater and the viewing environment in a home room. 1. Screen size and The brightness of the environment causes the following problems.
1. Judder is more likely to be felt when the screen size (the ratio of the screen to the human field of view) is large.
2. For movie theaters that have no reflected light other than the screen, the reflected light is generally present in the home environment due to lighting, ambient light, and walls and furniture. For this reason, the screen itself displayed on the display is required to be brighter than the film screening in the movie theater. For this reason, even if the interpolation frame image insertion period is the same as the shutter period TW1 in the movie theater, it is easy to feel that the screen is dark against the environment.

  Above 1.2. In general, in a home environment, by inserting a black screen in a period shorter than a black screen period (shutter period TW1) by a rotating shutter in movie film screening, while maintaining the brightness of the screen, It can display video with judder that gives a similar impression. This is the technique shown in FIG. However, it is difficult to arbitrarily adjust the black screen insertion period because a high processing capability is required as a circuit. On the other hand, according to the method shown in FIG. 5, it is possible to easily reproduce the judder amount optimized in consideration of the above 1 and 2, by appropriately adjusting the coefficient α. That is, according to the image display apparatus according to the present embodiment, it is possible to easily realize video display more suitable for the home viewing environment by appropriately adjusting the coefficient α.

<Third Embodiment>
Next, an image display apparatus according to a third embodiment of the present invention will be described. Note that components that are substantially the same as those of the image display device according to the first or second embodiment are denoted by the same reference numerals, and description thereof is omitted as appropriate.

  In the display method in the first embodiment (FIG. 4) and the display method in the second embodiment (FIG. 5), the interpolated frame image is inserted in a portion corresponding to each frame of the movie film. The In this case, when the signal format of the input video signal Vin is a film image signal such as 1080p24, for example, the configuration (frame configuration) of each frame is exactly the same as that of the movie film. An interpolated frame image can be inserted in the portion to be processed. Further, even when the input video signal Vin has been subjected to 2-2 pull-down processing, since each frame configuration is substantially the same as that of the movie film, the same processing can be performed. That is, in the signal subjected to the 2-2 pull-down process, an image for two frames is generated from one frame, so that the video is switched at a cycle of two frames. This two-frame period is the same as one period (for example, 24 Hz) of the movie film. For this reason, the display characteristics of the projector can be substantially reproduced by performing the process of inserting the interpolation frame image every two frame periods.

  On the other hand, in the case of a signal that has been subjected to 2-3 pulldown processing, the video is not switched with a simple cycle as in the case of 2-2 pulldown processing, and therefore an interpolation frame image cannot be simply inserted at a cycle of 24 Hz. FIG. 6 schematically shows an image configuration (frame configuration) of a signal subjected to 2-3 pull-down processing. In the 2-3 pull-down process, for example, a film image signal of 24 frames / second is converted into an image signal of 60 frames / second. For example, if the image of the first frame in the original film image is A and the image of the next second frame is B, in 2-3 pulldown, the sequence of images AB in the film image is called AABBB in the 60-frame image. Convert the sequence of images. In other words, an image for two frames is generated from the first frame image of the film image, and an image for three frames is generated from the next second frame image, thereby generating an image of five frames from the two frame images. To do.

  In FIG. 6, it is assumed that the image is a moving image, and the difference in frame is expressed by the difference in the position of the image. In the 2-3 pull-down signal, an image of 2 frames is displayed, then an image of 3 frames is displayed, and then an image of 2 frames is displayed. It becomes a switching cycle. Therefore, the video switching cycle is different from the switching cycle of the original movie film. For this reason, it is considered that the signal subjected to the 2-3 pull-down process is double-speed processed so as to match the switching cycle of the original movie film.

  FIG. 7 schematically shows a frame configuration when the frame rate conversion of the 60 Hz 2-3 pull-down signal shown in FIG. 6 into a 120 Hz image signal is simply performed. As shown in FIG. 7, simply by converting the frame rate to double speed, the video switching cycle is switched between a 4-frame period and a 6-frame period at 120 Hz. That is, the switching cycle remains irregular.

  On the other hand, FIG. 8 shows a frame obtained by converting the 60 Hz 2-3 pull-down signal shown in FIG. 6 into a 120 Hz image signal so that the video switching cycle is the same as the movie film switching cycle. A configuration is schematically shown. Instead of performing the simple double speed processing as shown in FIG. 7, the video is brought forward by one frame, and the video switching cycle is periodically switched in a 5-frame period at 120 Hz. . This five frame period is the same as one period (24 Hz) of a movie film. For this reason, the display characteristics of the projector can be substantially reproduced by performing the process of inserting the interpolation frame image every five frame periods. In the circuit configuration shown in FIG. 1, for example, when the interpolated frame image is inserted by the image insertion unit 13, such frame rate conversion may be performed.

<Other embodiments>
The present invention is not limited to the above embodiments, and other modifications can be made.
For example, a display method that combines the first embodiment and the second embodiment is also possible. In other words, the insertion period is optimized so as to be shorter than the shutter period, and an image in which the signal level is optimized to be lower than the signal level of the immediately preceding image is inserted as an interpolated frame image. You may do it.

  In the above description, the input video signal Vin is described as a film image signal generated on the basis of a movie film (silver film). However, a digital device used in the production of a so-called digital cinema. May be an image signal generated by. For example, it may be a digital image signal having a frame configuration substantially equivalent to that of a movie film, generated by a digital video camera capable of shooting at a frame rate equivalent to that of a movie film (24 frames / second).

  TW0 ... Frame period, TW1 ... Shutter period, TW2, TW4 ... Video display period, TW3 ... Insertion period, Vin ... Input video signal, 11 ... Image processing unit, 12 ... Film signal detection unit, 13 ... Image insertion unit, 14 ... Display panel, 15 ... MPU.

Claims (4)

When the input video signal is a film image signal generated based on a movie film or an image signal equivalent to a film image signal obtained by photographing with a digital photographing device, an interpolation frame image is added to the input video signal. An image insertion section to be inserted;
A display unit that displays video based on the video signal in which the interpolated frame image is inserted, and
The image insertion unit has a signal level lower than a signal level of an image immediately before inserting the interpolated frame image so as to reproduce display characteristics in a shutter period between frames when the movie film is projected by a projector. An image display device that inserts an optimized image as the interpolated frame image into a portion corresponding to each frame of the movie film in the input video signal. The input video signal is an image signal obtained by pulling down the first frame image and the subsequent second frame image with a different number of frames.
The image insertion unit has a cycle in which the input video signal has the same number of frames as the first frame image and the second frame image, and the first frame image and the second frame image are switched. , Convert the frame rate to be equivalent to the switching period before pull-down processing,
The image display device according to claim 1, wherein the interpolated frame image is inserted between the first frame image and the second frame image after the frame rate conversion. The image display according to claim 1 or 2, wherein the image insertion unit optimizes an insertion period of the interpolated frame image to be the same as a shutter period between frames when the movie film is projected by a projector. apparatus. The image display device according to claim 1, wherein the display unit is a hold-type display panel.

Images