JP5462516B2 - Moire elimination filter for re-photographed images - Google Patents

Description

The present invention is, in a so-called "recaptured" taking a picture of the image monitor by a television camera, re-shooting image for moiré eliminating filter ( "recaptured images which is mounted on the screen of the image monitor preventing Moire (interference fringes) This also relates to the configuration of the “moire elimination filter” .

  In general, in a studio of a broadcasting station, various images are projected on an image monitor (hereinafter sometimes abbreviated as a monitor), and the image itself or a scene image including the monitor screen on which the image is projected is displayed on a television camera (hereinafter referred to as a monitor). The so-called “re-shooting” is often used for shooting with a camera (sometimes abbreviated as “camera”). At this time, the period due to the pitch interval of the pixels on which the image monitor projects the video and the period due to the pitch interval of the pixels on the TV camera side (or the image sensor of the TV camera) generally do not match, There is a known problem that a period shift occurs visually and an interference fringe that deteriorates the image quality of “moire” (hereinafter sometimes simply referred to as moire) is generated. The phenomenon will be described with reference to FIG.

As shown in FIG. 7A, the pixel pitch 711 of the image monitor is different from the pixel pitch 721 of the television camera (also an imaging pitch. Hereinafter, the imaging pitch of the television camera may be simply expressed as a pixel pitch). However, since the pixel pitch 711 of the image monitor always appears for every four pixels of the pixel pitch 721 of the TV camera, the pixel pitch is suitable and a periodic pattern due to the difference in pixel pitch is generated. do not do. Therefore, no moire occurs. Four pixels are an example, and moire does not occur in the case of an integer multiple relationship.
The pixel pitch shown in FIG. 7B is different from the pixel pitch 712 of the image monitor and the pixel pitch 722 of the television camera, and the relationship of the pixel pitch from which the deviation of the pixel pitch is eliminated is not an integral multiple, and the deviation is different. Since it has occurred, it shows that a periodic pattern is generated.

As described above, when two fringes with different periods overlap, a moire that periodically becomes an optical interference pattern is generated due to a shift in pitch interval. Also in the relationship between the television camera and the image monitor, if there is a difference between the pixel pitch on the camera side and the pixel pitch on the monitor side and they are not adapted periodically, a striped pattern is generated periodically. More specifically, the synchronization signal for projecting video on the image monitor side, the pitch interval that the image monitor has as pixels, the synchronization signal for shooting on the television camera side, and the pixel pitch interval of the television camera affect these images. Since the period of the images generated by the monitor and the TV camera does not generally coincide with each other, a period shift occurs visually, and interference occurs mainly in the high frequency component as the frequency component of light, resulting in moire. Deteriorate the image quality.
Conventionally, these problems have been dealt with in terms of operation, such as reducing the focus of the camera or setting the zoom size so that moire does not occur.

As for moire, not only the relationship between the camera and the monitor, but also when two stripes with different periods interfere with each other, it is a phenomenon that can occur in various cases. There is Non-Patent Document 1.
Details of the moire in the TV camera and the image monitor will be described later.

Wikimedia Foundation, Free Encyclopedia “Wikipedia”, [March 13, 2009 search], Internet, <HYPERLINK "http://en.wikipedia.org/wiki/%E3%83%A2%E3% 82% A2% E3% 83% AC "http://en.wikipedia.org/wiki/%E3%83%A2%E3%82%A2%E3%83%AC>

However, nowadays, high-definition high-definition video can be watched on a large-screen TV at home, so when re-captured video is displayed, moiré is more noticeable than before. There is a problem of giving discomfort.
In addition, there is a demand for a moire improvement method other than a response such as reducing the camera focus or limiting the zoom size in the studio.

  Therefore, the present invention solves these problems, and the object of the present invention is to re-image moiré that eliminates moiré by simply attaching it to the front of the image monitor without manipulating the image of the camera. An object is to provide a cancellation filter.

In order to solve the above problems and achieve the object of the present invention, each invention is configured as follows.
In other words, the invention described in claim 1 is a moire elimination filter for recaptured video that is attached to the screen of an image monitor when the video of the image monitor is photographed by a television camera, and is incident from the image monitor. A low-pass film that diffuses and emits light with reduced high-frequency components, and a support that fixes the low-pass film, and the screen size of the image monitor is N (N is N In the case of a (positive number) type image monitor, the diffusion angle of the characteristics of the low-pass film was set to an angle that was within a range of ± 30% of the angle obtained by (500 / N) degrees.
The N-type image monitor means an N-inch image monitor, and is simply expressed as an N-type image monitor hereinafter.

In such a configuration, the low-pass film expands and blurs periodic video elements generated due to the image pitch of the N-type image monitor, or removes optical high-frequency components, and removes the cause of moire on the monitor side. . In addition, the diffusion angle of the characteristics of the low-pass film is set to an angle that is within a range of ± 30% of the angle obtained by (500 / N) degrees, so the low-pass characteristics that are optimal for an N-type image monitor The low-pass film works. As a whole, each of the above configurations functions as a moire eliminating filter for a re-photographed image having characteristics suitable for an N-type image monitor.

  Other means will be described in the embodiment for carrying out the invention.

According to the present invention, it is possible to remove the optical high-frequency component generated from the image monitor and to prevent the generation of moire simply by attaching the rephotographed image moire eliminating filter to the image monitor.
In addition, it is easy to install the moire eliminating filter for re-photographed images, and there is an effect that there is almost no deterioration in image quality.
Further, the re-photographed image moire eliminating filter is an optical filter, so that if it is a monitor that emits light, it can be widely used in a CRT (Cathode Ray Tube), PDP (Plasma Display Panel), liquid crystal monitor, and the like. .
In addition, there is an effect that it is possible to deal with image monitors having various screen sizes regardless of the type of image monitor such as a PC or a TV regardless of the PDP or liquid crystal panel.
Also, there is no moiré even when the camera is zoomed in, zoomed out, or panned, and the camera can be used widely.

It is a 1st block diagram which shows the state which decomposed | disassembled the moire removal filter for re-photographed images which concerns on Embodiment 1 of this invention. It is a figure which shows the method of using the moire removal filter for re-photographed images which concerns on embodiment of this invention. It is a figure which shows the spreading | diffusion of the light which injected into the moiré cancellation filter for re-photographed images from the image monitor at the time of installing the moiré cancellation filter for re-photographed images which concerns on embodiment of this invention. It is a 2nd block diagram which shows the state which decomposed | disassembled the moire removal filter for re-photographed images which concerns on Embodiment 2 of this invention. It is a 3rd block diagram which shows the state which decomposed | disassembled the moire removal filter for re-photographed images which concerns on Embodiment 3 of this invention. It is the figure which showed the 2nd method of mounting | wearing the image monitor with the moire removal filter for re-photographed images which concerns on embodiment of this invention. (A) is a figure which shows the form and kind of a fastener, (b) is the figure which showed the method of latching the moire removal filter for re-photographed images to an image monitor using a fastener. It is a figure which shows the principle of the moire generation | occurrence | production by the shift | offset | difference of the image pitch of an image monitor, and the imaging pitch (pixel pitch) of a camera. (A) is a case where the pixel pitch of the image monitor and the pixel pitch of the television camera are matched by an integer multiple, and (b) is a case where the pixel pitch of the image monitor and the pixel pitch of the television camera are shifted.

Embodiments of the present invention will be described below with reference to the drawings.
(First embodiment)
A first embodiment will be described with reference to FIG.
As shown in FIG. 1, the re-photographed image moire elimination filter 111 diffuses the image light incident from the image monitor 202 and emits it with a reduced high-frequency component, and suppresses reflection of illumination. The anti-reflection film 101, the low-pass film 103, and the fixing plate (support body) 102 that supports and fixes the anti-reflection film 101.

The low-pass film 103 has an optical low-pass characteristic and eliminates moire during re-shooting. This low-pass film 103 is located on the image monitor 202 side when viewed from the television camera 203, enters a video from the image monitor 202, and is a periodic video element generated due to the pixel pitch of the image monitor 202. The cause of moire is removed by diffusing and blurring or removing optical high frequency components. This low-pass film 103 is installed on one side of the fixed plate 102. The light emitted from the low-pass filter 103 is emitted to the antireflection film 101 through the fixed plate 102. When the screen size of the image monitor 202 is an N-type image monitor (N-inch image monitor), the diffusion angle of the characteristic of the low-pass film 103 is an angle obtained by (500 / N) degrees. The angle was set within a range of ± 30%. The reason why the low-pass film 103 eliminates the cause of moiré will be described later.

Further, the antireflection film 101 is located between the low-pass film 103 and the television camera 203, passes the light incident from the low-pass film 103, emits the light to the television camera 203, and closes the television camera 203 side. It prevents the existing external illumination from entering and disturbing the image. The antireflection film 101 is installed on the other side of the fixed plate 102. The antireflection film 101 prevents the external illumination from entering and disturbing the image as described above. Therefore, in the case where it is not a harsh environment in which the external illumination is strongly applied in a TV studio or the like, As unnecessary.
The fixed plate 102 is disposed between the low-pass film 103 and the antireflection film 101, supports the low-pass film 103 on one side of the fixed plate 102 on the image monitor 202 side, and is on the TV camera 203 side. The antireflection film 101 is supported on the other side, and the low-pass film 103 and the antireflection film 101 are held flat. The fixing plate 102 is formed of a material that can transmit light with a plate thickness that can fix the low-pass film 103 and the antireflection film 101 and stabilize the form. The fixing plate 102 is formed of a flat transparent acrylic plate having, for example, the same size as the low-pass film 103 and the antireflection film 101.

  Here, a filter outer frame 210 is provided for locking to the image monitor 202. The filter outer frame 210 supports the re-photographed image moire eliminating filter 111 and is engaged with the image monitor 202. The filter outer frame 210 includes a frame that supports the re-photographed image moire elimination filter 111 and a hook provided at a predetermined position of the frame. In addition, when the filter outer frame 210 is attached to the re-photographed image moire eliminating filter 111, is the surface of the low-pass film 103 of the re-photographed image moire eliminating filter 111 flush with the side surface of the filter outer frame 210? Alternatively, the filter is positioned outside the side surface of the filter outer frame 210. Therefore, when the re-photographed image moire eliminating filter 111 is attached to the image monitor 202 via the filter outer frame 210, the surface of the low-pass film 103 and the surface of the image monitor 202 are in contact with or in close contact with each other.

(How to use the moire elimination filter 111 for re-photographed images)
A method of actually using the re-photographed image moire eliminating filter 111 is shown in FIG.
In FIG. 2, the rephotographed image moire eliminating filter 111 is attached to the surface of the screen of the image monitor 202 via a filter outer frame 210. When the re-photographed image moire eliminating filter 111 is attached to the image monitor 202, the re-photographed image moire eliminating filter 111 surface and the image monitor 202 surface are in close contact with each other. At this time, moire does not occur even if “re-photographing” is performed from the television camera 203.

(Operation of the moire elimination filter 111 for the re-photographed image)
As described above, the occurrence of moire is caused by interference of stripe patterns having different periods or optical frequency components similar thereto.
In the above, the phenomenon that may occur due to the mutual relationship between the pixel pitch on the TV camera side and the pixel pitch on the image monitor side has been described. However, a method using the moiré elimination filter 111 for re-captured images that can be dealt with on the image monitor side is described. Next, a description will be given.

For example, even if there is an imaging pitch (pixel pitch) on the television camera side, moire does not occur in normal landscapes and scenes. With the exception of striped shirts and latticed stripes, ordinary landscapes and scenes generally do not contain periodic light components that interfere with the TV camera pixel pitch. Because. In other words, if a periodic component due to the pixel pitch on the image monitor side at the time of re-shooting is removed, it becomes almost the same as a normal landscape and sight, so no moire occurs. The image displayed on the image monitor is a sampled image so that a normal landscape or scene is placed on the pixel pitch on the image monitor side. At this time, the image reflected on the image monitor is mixed with a high-frequency component having a correlation with the pixel pitch (see Non-Patent Document 1).
Therefore, if this high-frequency component is appropriately removed, it becomes almost the same as an image of a normal landscape or scene, and moire does not occur. An optical low-pass film is attached in order to remove high-frequency components having a correlation with the pixel pitch. The above is the basic role of the rephotographed image moire eliminating filter 111 according to the embodiment of the present invention.
Therefore, in the low-pass film 103 in FIG. 1, the incident light of the optical image from the image monitor 202 may be diffused to intentionally remove the moire generation condition. Alternatively, the high-frequency component of light may be removed from the low-pass film 103.

FIG. 3 is a diagram showing diffusion (spreading, spreading) of light incident on the re-captured image moire eliminating filter 111 from the image monitor 202 when the re-photographed image moire canceling filter 111 of the present invention is installed in the image monitor 202. It is. In the absence of a filter, the light travels straight, but since the light is diffused in this way, the apparent resolution of the monitor on the camera side is reduced. It serves as a low-pass filter.

Further, the cause of moire is related to the pixel pitch on the TV camera side and the pixel pitch on the image monitor side, and the characteristic of diffusing the incident light of the low-pass film or the optical low-pass characteristic. This has been confirmed both experimentally and experimentally.
For example, in the case of an image monitor of about 50 inches (inch) to 40 inches (inch), the diffusion angle of the low-pass film 103 constituting the re-captured image moire eliminating filter 111 is about 10 degrees (7 It has been experimentally confirmed that moire (interference fringes) does not appear in the range of degrees to 13 degrees.

Further, in the case of an image monitor of about 40 to 26 type, the diffusion angle of the low-pass film 103 constituting the re-captured image moire eliminating filter 111 is about 20 degrees (range of 14 to 26 degrees). ), It has been experimentally confirmed that moire (interference fringes) does not appear.

Further, in the case of an image monitor of about 16 type, when the diffusion angle of the low-pass film 103 constituting the re-photographed image moire elimination filter 111 is about 30 degrees (range of 21 degrees to 39 degrees), the moire pattern. It has been experimentally confirmed that (interference fringes) do not appear.

  As described above, the low-pass characteristics of the low-pass film 103a (103) constituting the moire eliminating filter 111a (111) for the re-photographed image for the 50-type image monitor and the re-photographed image for the 16-type image monitor. Taking the low-pass film 103b (103) constituting the moire elimination filter 111b (111) as an example, the relationship with the low-pass characteristics will be examined next.

For example, the screen shape of a 50-inch image monitor is 1104 mm wide × 621 mm long, the horizontal direction of the video is 1280 pixels, and the vertical direction is 768 lines. At this time, the horizontal direction is 1.16 pixels / mm (0.863 mm / pixel), and the vertical direction is 1.24 lines / mm (0.809 mm / line).
The screen shape of the 16-inch image monitor is 343 mm wide × 193 mm long, the horizontal direction of the video is 1366 pixels, and the vertical direction is 768 lines. At this time, the horizontal direction is 3.98 pixels / mm (0.251 mm / pixel), and the vertical direction is 3.98 lines / mm (0.251 mm / line).
The 50-type image monitor is an example of a PDP (Plasma Display Panel), and the 16-type image monitor is an example of a liquid crystal panel. Since the liquid crystal panel is suitable for manufacturing pixels with a higher density than the PDP, the number of pixels in the horizontal direction of the 16-inch image monitor is 1366, which is different from and exceeds the number of pixels in the horizontal direction of the 50-inch image monitor. However, in the following description, since the pixel density is essentially important, the description will be continued with the above example.

Now, the pixel density in the horizontal direction of the 50-inch image monitor is 1.16 pixels / mm, and the pixel density in the horizontal direction of the 16-inch image monitor is 3.98 pixels / mm. The monitor is 3.44 times higher than the 50-inch image monitor.
Further, the line density in the vertical direction of the 50-inch image monitor is 1.24 lines / mm, and 3.98 lines / mm in the vertical direction of the 16-inch image monitor. Is 3.22 times higher than the 50-inch image monitor.
Note that although it is expressed as a line (number) in the vertical direction, it is considered as a pixel (number) substantially because it is a factor that determines a video pixel in the vertical direction.
Considering this, the 16-inch image monitor has a pixel density 3.44 times higher in the horizontal direction and 3.22 times higher in the vertical direction than the 50-type image monitor.

This is mainly due to the fact that the 16-inch image monitor has a pixel pitch of (50/16) times that of the 50-inch image monitor, that is, about 3 times the pixel pitch of the 50-inch image monitor. doing. Therefore, the equivalent striped pattern of the image on the 16-inch monitor side becomes finer, and if the TV camera side has the same conditions, the conditions for generating moire also differ. Note that the fact that the pixel pitch is dense and the striped pattern of the image is fine means that an optical high-frequency component is mixed in the image. Therefore, it is necessary to change the light diffusing characteristic or the low-pass characteristic of the low-pass film 103 included in the rephotographed image moire eliminating filter 111.

As described above, in the relationship between the 50-type image monitor and the 16-type image monitor, the 16-type image monitor has a pixel pitch of (50/16) times the pixel pitch of the 50-type image monitor, that is, about 3 times. It was crowded. As a result of the experiment described above, the optimum diffusion angle of the low-pass film 103a (103) constituting the moire eliminating filter 111a (111) for re-photographed images in the case of a 50-type image monitor is about 10 degrees. The optimal diffusion angle of the low-pass film 103b (103) that constitutes the re-photographed image moire elimination filter 111b (111) in the case of a 16-inch image monitor is It was about 30 degrees (range of 21 degrees to 39 degrees). This indicates that the optimum diffusion angle is about 3 times, and there is a correlation with the relationship of about 3 times the pixel pitch.
Therefore, if the pixel pitch is dense depending on the size of the screen of the image monitor, it means that the characteristic of diffusing the light of the low-pass film 103 or the low-pass characteristic needs to be changed in proportion thereto.

That is, the 16-inch image monitor is about three times as dense as the 50-inch image monitor, and when attention is paid to one pixel, the 16-type image monitor is about 1/3 smaller. The range of light reaching the 50-inch diffuses light with optimum diffusion angle of about 10 degrees of the low-pass film 103a (103) camera, about 1/3, to equal the pixel is small type 16, diffusion The fact that the angle needs to be about three times is also true from the calculation.

If the light diffusing characteristic of the low-pass film 103 is increased more than necessary, the resolution of the monitor is lowered. For example, as described above, in the 50-type image monitor, the diffusion angle of the low-pass film 103a (103) constituting the re-photographed image moire eliminating filter 111a (111) is about 10 degrees and no moire occurs. Further, no moire occurs even if the re-photographed image moire eliminating filter 111b (111) of the low-pass film 103b (103) having a diffusion angle of about 30 degrees used for the 16-inch image monitor is used for the 50-inch image monitor. However, the resolution of the image monitor decreases. Therefore, in general, in an N-type image monitor, there is an optimum diffusion angle of the low-pass film 103 of the re-photographed image moire eliminating filter 111 from the relationship between moire generation conditions and resolution.

In general, the diffusion angle (angle θ in FIG. 3) of the low-pass film of the moiré eliminating filter for recaptured image used in the N-type image monitor is the low band of the moiré canceling filter 111 for recaptured image used in the 50-type image monitor. It has been experimentally confirmed that (50 / N) times the diffusion angle of the passing film 103 is necessary.
Also, as described above, the diffusion angle of the characteristic of diffusing almost optimal light of the low-pass film 103a (103) of the re-image moiré eliminating filter 111a (111) used for the 50-inch image monitor is about 10 degrees. Therefore, the optimum diffusion angle of the light diffusing characteristic of the re-photographed image moire eliminating filter for a general N-type (N-inch) image monitor is the size of the screen in the N-inch monitor based on the 50-inch monitor. Since it is inversely proportional, the optimum diffusion angle θ is approximately θ = 10 × (50 / N)
= 500 / N
It is expressed. The unit is an angle [degree].

Although the above is based on the data of a 50-inch image monitor, it is confirmed from the above experimental results that N representing the size of the monitor screen and the diffusion angle θ of the light diffusing characteristic are inversely proportional. Therefore, the expression representing the optimum diffusion angle θ of the light diffusing characteristic is not a special relational expression obtained from the experimental results of only the 50-type image monitor, and can be applied to a general N-type image monitor. It is a relational expression.
It has been experimentally found that there is a range in the diffusion angle at which moire can be eliminated, which is eliminated by a characteristic range of ± 30% with respect to the angle calculated at 500 / N. The optimum range is a range of ± 15% of the angle calculated at 500 / N. If the angle of light exceeds (500 / N) ± 30%, the image will gradually become unclear when re-shooting.

(Second Embodiment)
A second embodiment will be described with reference to FIG.
As shown in FIG. 4, the re-captured image moiré elimination filter 411 diffuses the image light incident from the image monitor 202 and emits the reduced high-frequency component, and suppresses reflection of illumination. Antireflection film 101, antireflection film 404 for suppressing irregular reflection, and anti-reflection films 101 and 404 and low-pass film 103 are supported and fixed plate (support) 102 for fixing. .
Here, the low-pass film 103, the antireflection film 101, the fixing plate 102, and the filter outer frame 210 are the low-pass film 103, the antireflection film 101, the fixing plate 102, and the film outer frame 210 in the first embodiment, respectively. And has the same function, description thereof will be omitted.

  Further, the antireflection film 404 is located between the antireflection film 101 and the low-pass film 103, passes the image coming from the low-pass film 103, and emits it to the antireflection film 101 and the TV camera 203. It serves to suppress external illumination from being diffusely reflected by the low-pass film 103.

(Third embodiment)
A third embodiment will be described with reference to FIG.
As shown in FIG. 5, the moiré elimination filter 511 for a re-photographed image diffuses the light of the image incident from the image monitor 202 and emits the reduced high-frequency component, and suppresses reflection of illumination. Anti-reflection film 101, polarizing film 505 for suppressing irregular reflection, and anti-reflection film 101, polarizing film 505 and low-pass film 103 are supported and fixed plate (support) 102 for fixing. Yes.
Here, the low-pass film 103, the antireflection film 101, the fixing plate 102, and the film outer frame 210 are the low-pass film 103, the antireflection film 101, the fixing plate 102, and the outside of the film, respectively, in the second embodiment. It corresponds to the frame 210 and has the same function.
The polarizing film 505 is replaced with the antireflection film 404 in the second embodiment. However, as a function, the polarizing film 505 serves to suppress external illumination from being diffusely reflected by the low-pass film 103, and is substantially the same as the antireflection film 404 in the second embodiment. Therefore, explanation is omitted.
The antireflection film 101 prevents the external illumination from entering and disturbing the image as described above. Therefore, in the case where it is not a harsh environment in which the external illumination is strongly applied in a TV studio or the like, As unnecessary.

(Other embodiments)
The present invention is not limited to the above embodiments.
For example, in FIG. 1, the configuration of the anti-reflection film 101, the fixed plate 102, and the low-pass film 103 is shown in order from the television camera 203 side for the re-captured image moire elimination filter 111. The low-pass film 103, the fixing plate 102, and the antireflection film 101 may be used.

  In FIG. 1, only the low-pass film 103 and the fixed plate 102 may be provided in order from the television camera 203 side. This configuration omits the antireflection film 101, but functions sufficiently in an environment where the influence of external illumination is small as described above. The same applies hereinafter.

  In FIG. 5, the moiré elimination filter 511 for the re-photographed image shows the configuration of the antireflection film 101, the fixing plate 102, the polarizing film 505, and the low-pass film 103 in order from the television camera 203 side. The low-pass film 103, the fixed plate 102, and the polarizing film 505 may be configured in this order from the 203 side.

  Further, the low-pass film 103, the polarizing film 505, the fixing plate 102, and the antireflection film 101 may be configured in this order from the TV camera 203 side.

  Further, the low-pass film 103, the fixing plate 102, the polarizing film 505, and the antireflection film 101 may be configured in this order from the TV camera 203 side.

  Further, the fixing plate used in the moiré eliminating filter for re-photographed images according to the present invention has been described above by taking an acrylic plate as an example, but other plastics may be used as long as it is transparent, glass or organic resin. May be.

Further, the fixed plate as the support is expressed as “plate” and suggests a planar shape, but is not necessarily a flat plate as long as it functions as a support. It may be a “fixed frame” in which only a frame is provided on the outside.
Further, in the fixing plate 102, the plate and the frame are separately formed and assembled later, but the fixing plate 102 may be integrally formed with the filter outer frame 210 shown in FIG.

The filter outer frame 210 is illustrated as a means for locking to the image monitor 202 in FIGS. 1, 4, and 5. However, as shown in FIG. 6, the filter outer frame 210 has two stages made of metal or plastic. There is also a method of using either one of the folded fasteners 601 and 602. As shown in FIG. 6B, at least the lower part and the upper part of the image monitor 202 are fixed to the image monitor 202 with one end of the fastener 601 bent in two stages, and the other end of the photographic image moire is attached to the other end. The cancellation filter 111 is placed or used while being pressed. Moreover, although the method using the fastener 601 at the top and bottom is shown in FIG. 6B, there is also a method of securely locking the fastener 601 on one or both of the left and right. There is also a method in which the fastener 601 is used only on the left and right sides and not on the top and bottom.
Depending on the size and shape of the image monitor 202 and the re-captured image moiré elimination filter 111, a small fastener such as the fastener 602 may function sufficiently. When the recaptured image moire eliminating filter 111 is attached to the image monitor 202 with these stoppers 601 and 602, the recaptured image moire eliminating filter 111 surface and the image monitor 202 surface come into contact with each other.

The moiré elimination filter for re-photographed images of the present invention may be widely used as a moiré elimination filter for monitoring TV images or PC images in “re-imaging” at a news studio of a broadcasting station.
Also, as large-screen monitors and handy cameras have become widespread for general household and business use, opportunities for “re-photographing” have also increased outside of broadcasting stations, and are used for monitors for home and business use. There is a possibility that will be.

101, 404 Antireflection film 103 Low-pass film 102 Fixed plate (support)
111,411,511 re shooting image for moiré eliminating filter 505 polarizing film 202 image monitor 203 TV camera 210 pixel pitch 721 722 a television camera of the pixel pitch of the filter outer frame 601, 602 fasteners 711 and 712 image monitor

Claims (4)

A moiré elimination filter for re-captured images that is attached to the screen of the image monitor when taking images from the image monitor with a TV camera and eliminates moiré.
A low-pass film for diffusing and emitting high-frequency components by diffusing light of an image incident from the image monitor, and a support for fixing the low-pass film,
When the screen size of the image monitor is an N (N is a positive number) type image monitor, the diffusion angle of the characteristic of the low-pass film is (500 / N) degrees, which is ± 30 of the angle obtained. A moire elimination filter for re-captured images, characterized in that the angle is set to an angle in the range of%. A moiré elimination filter for re-captured images that is attached to the screen of the image monitor when taking images from the image monitor with a TV camera and eliminates moiré.
A low-pass film that diffuses light emitted from the image monitor and emits it with a reduced high-frequency component, an antireflection film for suppressing reflection of illumination, and the low-pass film and the antireflection film are fixed. And a support that
When the screen size of the image monitor is an N (N is a positive number) type image monitor, the diffusion angle of the characteristic of the low-pass film is (500 / N) degrees, which is ± 30 of the angle obtained. A moire elimination filter for re-captured images, characterized in that the angle is set to an angle in the range of%. A moiré elimination filter for re-captured images that is attached to the screen of the image monitor when taking images from the image monitor with a TV camera and eliminates moiré.
A low-pass film that diffuses and emits light of an image incident from the image monitor to reduce high-frequency components, a polarizing film for suppressing irregular reflection, and a support that fixes the low-pass film and the polarizing film And having
When the screen size of the image monitor is an N (N is a positive number) type image monitor, the diffusion angle of the characteristic of the low-pass film is (500 / N) degrees, which is ± 30 of the angle obtained. A moire elimination filter for re-captured images, characterized in that the angle is set to an angle in the range of%. A moiré elimination filter for re-captured images that is attached to the screen of the image monitor when taking images from the image monitor with a TV camera and eliminates moiré.
A low-pass film that diffuses light emitted from the image monitor and emits light with a reduced high-frequency component, an antireflection film for suppressing reflection of illumination, a polarizing film for suppressing irregular reflection, and the low-pass film A band-pass film, the antireflection film, and a support for fixing the polarizing film,
When the screen size of the image monitor is an N (N is a positive number) type image monitor, the diffusion angle of the characteristic of the low-pass film is (500 / N) degrees, which is ± 30 of the angle obtained. A moire elimination filter for re-captured images, characterized in that the angle is set to an angle in the range of%.