JPS61224587A - Auxiliary device for observation of film image - Google Patents

Abstract

PURPOSE:To automatically obtain a most appropriate color balance by supplying a part of a light beam that is supplied to a video camera through a color correcting means to a density measuring means that measures a large area average transmission density, and controlling a color correction state based upon a result of comparison between above value and a density output when a film to be observed is equipped. CONSTITUTION:When a film F to be observed is equipped, the large area average transmission density of three color primaries of the light beam that is transmitted the film F is measured at a density control measuring means 13 and also, the result measured is supplied to a control means 17 and a density ratio is calculated. The control means 17 compares the density ratio already stored when the most appropriate color balance is obtained at the time when a reference film is equipped with the density ratio obtained when an easily observable film F is equipped at a comparison process part 172, and based upon the compared result, a control output part 173 outputs an appropriate control signal to a driving control means 18 and operates to control a color correcting means 6 to produce the prescribed relation between both density ratios.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention is used for observing images captured on a color still film, that is, a color positive film or a color negative film, on a monitor television receiver via a video camera. The present invention relates to a film image observation auxiliary device.

2. Description of the Related Art Conventionally, various auxiliary devices have been put into practical use for viewing color still film taken with a still camera on a monitor television receiver via a color video camera. A schematic diagram of the configuration is shown.

In Fig. 6, 1 is a light source, 2 is a heat ray absorption filter, 3 is a positive or negative color filter, 4 is a diffusion plate, 6 is a film holder on which the color steel film F is attached,
Reference numeral 6 indicates a mounting configuration of a video camera 8 including a mirror and 7 a close-up lens.

In the configuration as shown in the figure, after the color steel film F is mounted on the film holder 5 and the color filter 3 is selected according to the film F mounted thereon, when the light source 1 is turned on, the filter 3. The light that has passed through the film F etc. is reflected by the mirror 6, and is imaged on the imaging plane of the optical camera 8 by the mounting structure 7 including the close-up lens.

As a result, the image photographed on the color still film F is converted into a video image signal and can be observed on a monitor television receiver (not shown).

However, it is generally known that color still films photographed with still cameras have large differences in color tone and density depending on the conditions at the time of imaging. It is necessary to adjust the hue, brightness, etc. on the television screen while visually checking the television monitor screen using appropriate adjustment knobs provided on the television monitor or video camera. That is, the above adjustment operation must be performed every time the film is replaced.

On the other hand, the above-mentioned points are common to well-known color steel film printing apparatuses, that is, it is necessary to appropriately adjust differences in film color tone and density even in printing apparatuses.
It has the same troublesome operation. However, in recent years in this field, systems have been put into practical use that automatically notify the state of the adjustment. For example, a system has been developed that can instruct the amount of adjustment of the aforementioned adjustment knob.

For this reason, even in the field of the auxiliary devices mentioned at the beginning, which is the object of the present invention, there is currently a strong desire to simplify adjustment operations such as those of the above-mentioned printing device.

Problems to be Solved by the Invention As mentioned above, in the conventional film image observation auxiliary device, it is extremely troublesome to adjust the color tone and density for each film, and the amount of adjustment is difficult, for example in a printing device. Even if it is possible to notify the camera of the film, it is troublesome to have to manually operate the adjustment knob for each film. The problem is that it cannot be observed with a John receiver.

Means for Solving the Problems The film image observation auxiliary device according to the present invention aims to solve the above-mentioned problems, and includes a light source that emits light containing all necessary wavelengths, and cyan.

Color correction means consisting of magenta and yellow filters,
A first optical system formed of a half mirror or the like and guiding the light emitted from the light source to the video camera, a density measuring means for measuring the large area average transmission density of the three primary colors of the supplied light, and the half mirror. a second optical system that guides light that is not guided to the video camera and that is obtained through the half mirror to the density measuring means, and each filter of the color correcting means is moved independently; a drive means for controlling the hue of the light passing through the optical system; a drive control means for controlling the operation of the drive means; and a drive control means for controlling the operation of the drive means; A control device including a storage section that calculates and stores the ratio, a comparison processing section that compares the contents stored in the storage section, and a control output section that outputs a control signal based on the comparison result of the comparison processing section to the drive control means. It consists of

Operation Since the film image observation auxiliary device according to the present invention has the above-mentioned configuration, first, a standard color steel film containing all hues uniformly is placed in the first optical system, and then a video camera is used. Alternatively, if the optimum color correction state is set in consideration of the characteristics of the monitor television receiver, the large area average transmission density of the three primary colors in that state will be measured and the density ratio will be stored as the first density signal. ,
Therefore, when the color steel film to be observed is placed in the first optical system, the large area average transmission density of the three primary colors is measured and the density ratio is stored as a second density signal and compared with the first density signal. The drive control means and drive means are operated by the control means so that a predetermined relationship is established, and the three filters serving as color correction means are moved independently as appropriate.As a result, automatically Optimal color correction can be performed for various films to be observed.

Embodiment FIG. 1 is a schematic diagram of an embodiment of a film image observation auxiliary device according to the present invention, and parts in the figure with the same numbers as cylinders have the same functional structure.

In the figure, 9 is a cyan filter 97. magenta filter 92
, a yellow filter 93, which controls the hue of the light emitted from the light source 1.

1o is a condenser lens, 11 is a half mirror,
Color correction means 9 mentioned above. Diffusion plate 4. Film holder 5
Together, they form a first optical system 01 that guides the light projected from the light source 1 to the video camera 8.

Reference numeral 12 denotes a diffusion plate that diffuses the supplied light and makes all the hues uniform, and together with the above-mentioned half mirror 11, there is a second optical system that guides the light that is not guided to the video camera 8 to a density measuring device 13, which will be described later. This forms system 02.

Reference numeral 13 denotes concentration measuring means, which includes filters 14 that transmit only red, blue, and green light, respectively. ．． a group of color filters 14 consisting of color filters 142 and 143; a group of photosensors 16 that receives the light supplied through the color filters 14, that is, the three primary colors; and a module that amplifies the received light output of the photosensor group 15 and converts it into a digital signal. It consists of a D converter 16 and is used to measure the large area average transmission density of the three primary colors of light that reaches the diffuser plate 12.

Reference numeral 17 denotes a control means, which includes a storage unit 177 that receives the concentration signal from the concentration measurement unit 13 and stores the signal as a concentration ratio, a comparison processing unit 172 that performs comparison processing on the contents stored in this storage unit, and a comparison processing unit 172 that performs comparison processing on the contents stored in this storage unit. The control output section 173 outputs, to the drive control means 18, an output signal for controlling the operation of the drive means 19, which will be described later, based on the comparison result of the section 172.

18 is a drive control means, which is a control output section 173 of the control section 17;
A plurality of drive sources 19. which independently move the three filters 91e, 92t, and 93 constituting the color correction means 9 in response to output signals from the color correction means 9. ．． This is for outputting a drive control signal for controlling the operation of the drive means 19 consisting of 192.degree. and 193.degree.

In addition, 20 is the above three color filters 91 + 92 e
The manual drive means for manually moving the barrels 93 independently of each other is shown.

In the above embodiment, the light emitted from the light source 1 has its hue controlled by the color correction means 9, is diffused by the diffuser plate 4, and reaches the half mirror 11 via the condenser lens 10° film holder 5. become.

...-Most of the light that reaches the humirar 11 is reflected,
is incident on the video camera 8 via an appropriate mounting configuration 7,
Further, a part of the light is incident on the optical sensor group 15 via the diffuser plate 129 and the color filter 14 .

It goes without saying that when the color still film F having a suitable subject image is mounted on the film holder 6, the subject image is formed on the imaging surface of the video camera 8 by the light. do not have.

That is, in the apparatus according to the present invention, light from the light source 1 is made to enter the video camera 8 via the first optical system 01, and at the same time, is made to enter the density measuring means 13 via the second optical system 02. When the film is loaded, the film image is formed on the imaging surface of the camera 8 and the 3
In other words, the large area average transmission density of the primary colors is measured.

Now, the film image observation operation of this embodiment will be described below.

In this embodiment, as mentioned earlier, a standard color steel film containing all hues uniformly is first mounted on the film holder 5, and the color tone etc. of the appropriate color steel film is automatically controlled. A standard state setting operation will be performed for this purpose.

It goes without saying that such an operation takes into consideration the characteristics of the video camera 8 or the monitor television receiver (not shown) itself, and specifically, the standard force 2 - loading the still film onto the film holder 6 This is done by adjusting the color correction means 9 so that the color balance on the screen of the monitor television receiver becomes optimal.

When the above adjustment is performed and the optimum state is obtained, the large area average transmission density of the three primary colors of the light supplied to the density measuring means 13 at that time is measured, and the density ratio is determined by the control means 17.
This is stored as a standard value corresponding to the video camera 8 etc. in use.

Next, an observation colored steel film F is attached to the film holder 5 in place of the standard color steel film.

When the film F to be observed is mounted, the large-area average transmission density of the three primary colors of the light transmitted through the film F is measured by the density measuring means 13, and the control means 1 also controls the measurement, as in the case of the standard film described above. The results are provided and the concentration ratio is calculated.

Then, the control means 17 uses the comparison processing unit 172 to compare the previously stored density ratio when the optimum color balance is obtained when the standard film is mounted, and the density ratio when the film to be observed is mounted. Based on the comparison result, the control output section 173 outputs an appropriate control signal to the drive control means 18, and operates to control the color correction means 9 so that the above density ratios have a predetermined relationship.

That is, by comparing the two density ratios mentioned above, the control means 17 causes the drive means 19 to move each filter forming the color correction means 9 so that both density ratios have a predetermined relationship. It outputs a control signal for controlling the drive control means 18.

The drive control means 18 appropriately drives the drive means 19 by receiving a control signal from the control means 17, and as a result, each filter forming the color correction means 9 can be moved independently and suitably. This will change the color correction state.

At this time, the change in the color correction state by the color correction means 9 described above is detected by the density measurement means 13 via the second optical system 02, that is, it is detected as a change in the density value of the film to be observed. That will happen.

Therefore, it goes without saying that the concentration ratio calculated in the control circuit 17 and the comparison processing operation result in the comparison processing section 17□ change as the filter moves.
Then, at the time when a predetermined relationship is obtained as a result of the comparison processing operation, the control output section 173 outputs a control signal to the drive control means 18 to stop the filter moving operation by the drive means 19, and at this point, the main This means that the automatic color correction operation by the inventive device ends.

The observation operation in the embodiment shown in FIG. 1 has been described above, but the control means 17 that stores and compares the density ratios of the three primary colors and controls the color correction means 9 is preferably constituted by a microcomputer. A specific example will be explained with reference to the flowchart shown in FIG. still,
B, G, and R shown in FIG. 2 are the three primary colors obtained by the density measuring means 13 when a standard color steel film is attached and the optimum color balance is obtained by operating the manual drive means 2o. Density outputs B', G', and R' indicate the density outputs of the three primary colors obtained by the density measuring means 13 when the observation film is attached, and the drive control means 18 controls the density ratio between the three primary colors in the standard film. The measurement shall be performed so that the density ratios of the three primary colors on the observation film are equal.

First, in step 200, the control circuit 17 receives the large-area average transmission density output of the three primary colors in a state where the optimum color balance is obtained when the standard film is attached, from the density measurement means 13, and uses, for example, the density output of blue as a reference. concentration ratio τ1g
remember. That is, in step 200 B/G = g
, B/R=r, and store g and r.

Next, in step 201, it is determined whether the color steel film to be observed has been installed in the film holder sK, and if the film is replaced, the next step 202 is selected. In addition, step 2
It goes without saying that 01 can be easily realized by detecting the attachment and detachment of the film onto and from the holder 5 using an appropriate switch means.

Step 202 is a step of first calculating C' of the density ratio g/, r/ of the three primary colors of the mounted film. That is, this step 2o2 is a step of detecting the outputs S/, C, / corresponding to blue and green among the three primary color density outputs, and calculating ν/=nV. Before selecting step 202, check whether the respective levels of the concentration outputs B' and G/ outputted from the concentration measuring means 13 are within the optimum level range determined by the accuracy of the microcomputer, the power supply voltage, etc. A step to confirm whether or not, for example,
Needless to say, if a signal with an extremely low or high level is obtained, a step may be added to notify that the hue of the corresponding color needs to be appropriately adjusted within the level range.

When step 202 is completed, step 203 is selected, and the concentration ratio g stored in step 200 and the step 20
The concentration ratio g' obtained in step 2 is compared, and if the comparison result is g>g', step 204 is selected, if g <g', step 205 is selected, and if g = g', step 20676' is selected. will be done.

In step 204, the comparison result in step 203 is g>
g', that is, the density ratio of green to blue in the three primary color densities of the observation film is larger than that of the standard film).On the other hand, in this example, as mentioned earlier, This is an example in which the density ratio in the standard film and the density ratio in the observation film are made equal. Therefore, in the above case, it is necessary to lower the green density ratio, so the yellow filter 930 of the color correction means 9
This is a step of outputting to the drive control circuit 18 a control signal for decreasing the proportion of the magenta filter 92 in the optical path or increasing the proportion of the magenta filter 92 in the optical path.

When the output of the control signal is started in step 204, step 202 is selected again, and the change in concentration ratio C' based on the movement of the filter in step 204 is input to step 203. The output state of the signal will continue until g=g' and step 205 is selected.

On the other hand, in step 205, g <
g', that is, the green density ratio is small. Therefore, the drive control means sends a control signal to increase the ratio of the yellow filter 930 to the optical path or to decrease the ratio of the magenta filter 92 to the optical path. Needless to say, this is a step in which the control signal is outputted to 18, and the control signal output is continued until g=g'.

In step 208, the comparison result in step 203 is g=
This is the step selected when g' is reached, and the blue color
This is a step of detecting the red density output and calculating another type of density ratio r'. That is, in step 206, r'=
This is a step of calculating B'/R'.

When τ is calculated in step 206, the r' is compared with the previously explained r in step 207, and when the comparison result becomes r)r', step 208 is executed.

When r (r', step 209 is selected, and when r = r', step 210 is selected.

In step 20B, the comparison result in step 207 is r)
This is a step selected when the ratio of red density to blue is large, that is, when the ratio of red density to blue is large, and a step of outputting a control signal to increase the ratio of the cyan filter 91 to the optical path in order to lower this red density ratio. It is. Then, when a control signal is output from step i 208, step 206 is selected again, and as in the case of steps 204 and 205 described above, the control signal is r=r'
is output until .

Further, step 209 is the opposite of step 208, that is, a step selected in the case of r and r', and is a step of outputting a control signal for reducing the proportion of the cyan filter 91 in the optical path. Its control output is step 2
Similarly to 08, the output will continue until r=r'.

Note that the adjustment of the red density ratio aimed at in steps 208 and 209 can be performed by controlling the yellow filter 930 in addition to controlling the cyan filter 910 described above; It is clear that the adjustment is greatly affected by the cyan filter 9. This means that the adjustment is limited to the following.

Step 207 in step 208 or 209 above
When the comparison result becomes r=r', step 210 is selected, and the steps from step 202 to step 209, that is, the comparison operation of g and g/ and r and r' are performed a preset N times. An operation is then performed to determine whether or not it has been completed.

This step 21o is an operation in which the comparison operation in steps 203 and 207 compares the ratio of two colors among the three primary colors, and the characteristics of each filter cannot control only the corresponding color, so one comparison operation is performed. At the same time g=g
This step is provided because it is virtually impossible for ``, τ=r'' to hold true. In other words, even if r=r' is obtained after g=g', in most cases the previous relationship g=g' does not hold, and the error in such a case is calculated by comparing the This step is provided to reduce the number of times by appropriately increasing the number of times.

Therefore, if N comparison operations have not been performed, step 202 is selected again; if they have been performed, step 20
1, and the steps after step 202 will not be performed thereafter until a new observation film is attached. In other words, the apparatus is maintained in an optimal state for the currently attached observation film that has undergone each of the above steps.

A specific example in which the control means 17 is configured by a microcomputer has been described above, but it goes without saying that various other configurations are possible.

Now, one embodiment of the film image observation device according to the present invention described above is based on the law that the concentrations of the three primary colors red, blue, and green are equal in the large area average transmission density of a general film, that is, the well-known Evans' law. Based on the law, it can be said that this is an example.

However, some films may be photographed with subjects whose hues are significantly biased, such as those taken on golf courses, beaches, or other locations with red carpets. In the correction operation, accurate color correction becomes extremely difficult.

In other words, the color balance in the large area average transmission density is R))
When B=G, if color correction is performed using the example shown in Figure 2 based on Evans' law, the correction will be too strong for red, resulting in an image with little red. It is.

FIG. 3 shows a schematic configuration diagram of another embodiment of the film image observation device according to the present invention, which can also correct the hue deviation as described above. In the figure, the same numbers as those in FIG. 1 have the same functions. Parts and means are shown.

As is clear from FIG. 3, compared to the embodiment shown in FIG.
An ND filter 21 and a moving means 22 for controlling the attachment and detachment of the HD filter 21 to and from the optical path are added between the ND filter 21 and the diffuser plate 4.

That is, in the embodiment shown in FIG. 3, the large area average transmission density of the three primary colors is measured with each filter, which is the color correction means 9, removed from the optical path and the HD filter is attached, and the density ratio for, for example, blue is detected. By this, the color deviation of the film to be observed is detected, and in addition to the color correction operation as explained in FIG. The operation of the above-mentioned embodiment and a specific example of the control means 17' will be explained below with reference to the flowchart of FIG. 4. The ND filter 21 functions to control the amount of light in the optical path when the color correction means 9 is removed, that is, to prevent the output of the optical sensor group 15 of the density measurement means 13 from becoming saturated. Needless to say, including the transportation means 22,
For example, it is clear that it can be replaced with a means for controlling the brightness of the light source 1 as appropriate.

Now, when the standard film is mounted on the film holder 5 at step 400 in FIG. 4, step 401 is selected and each filter forming the color correction means 9 is completely removed from the optical path, An HD filter 21 is placed in the optical path.

Next, step 402 is selected, and the large area average transmission density Bl e G+ e ''j of the three primary colors in the above state is measured by the density measuring means 13, and further, for example, the density ratio α=B, /cr1 with blue as the reference , β= B v' R
+ will be calculated. Such α and β are usually 1
However, if there are variations in the optical system or concentration measurement system, the value will not be 1, so this step was provided to compensate for this.

When step 402 is completed, step 403 is selected, the ND filter 21 is removed from the optical path, and the color correction means 9 is instead placed in the optical path.

Next, step 404 is selected, and the color correction means 9 is controlled by the manual adjustment means 2o so that the monitor television receiver has the optimum color balance, and the large area average transmission densities B, G, and R of the three primary colors at that time are detected. and its concentration ratio g=B/G,
r=R/r will be calculated. It goes without saying that step 404 is the same step as step 2oo described in FIG. 2.

When each step as described above is completed, next step 40
At step 5, the standard film is exchanged with the film to be observed or a new observation film. That is, the observation film is attached to the film holder 5.

After the observation film is attached, in step 406, the color correction means 9 is removed from the optical path and the ND filter 21 is placed in the optical path, as in the previous step 401.

Next, step 407 is selected, and the large area average transmission density B2 t G2 * R2 of the three primary colors in the above state is measured, and for example, the amount of color deviation with respect to blue as the standard is determined as the density ratio x
, y as the concentration ratio α, β obtained in the previous step 402
It will be calculated taking into account.

That is, X=B2/αG217=B2/79-nz is calculated.

When this step 407 is completed, the previous step 40
Step 408 similar to 3 is selected, and ND filter 2
1 is placed outside the optical path, and color correction means 9 is placed inside the optical path.

On the other hand, X and y obtained in step 407 are stored as appropriate correction values based on a relational table as shown in FIG. 6, which was obtained by the inventor of the present invention through various studies in a step after the completion of step 40B. become. That is, X is Q, 85
≦X≦1.15, and y is set to a value within the range of 0.80≦y≦1.2o.

Now, assuming that the memory storing the above x+7 is set to 2 and the reference state is the content of address 1 shown in FIG. 5, the above state is first set in step 409. That is, K
The content of is reset to K(1) and is set to address 1 in Figure 5.
Correspond to! =1, 7=1 is Sera. will be played.

Next, in step 410, X obtained in step 407 is compared with one criterion 1.15, i.e., x(1,1
S? is calculated, and if X is not smaller than 1.15, step 411 is selected, and if it is smaller, step 412 is selected.

Since X is not smaller than 1.16, that is, it is larger, step 411 is a step of specifying address 2 in the relational table of FIG. 6, where only X is larger than the predetermined range, and is reset first. 1 is added to the contents of K to set K(2).

Step 412 also determines whether X is greater than the other criterion;
That is, x>o, 85? This is a step of calculating , and if it is large, step 413 is selected, and if it is small, step 414 is selected.

Step 413 determines that X is less than 1.15 and 0.8
This step is selected when X is smaller than the predetermined range. Therefore, this is a step to specify address 3 in the relational table of FIG. 6, which is a condition where X is smaller than the predetermined range. 2 is added to set K(3).

Step 414 is a step selected not only when X is 0.86 or more in step 412 described above, but also when step 411 or 413 is completed, and is a step for the other concentration ratio y.

That is, step 414 is a step of calculating y(1,20?). If y is not smaller than 1.20, step 415 is selected, and if it is smaller, step 416 is selected.

In step 415, in addition to the conditions of This is to set. Therefore,
All you have to do is add 3 to the address contents of K set up to step 414, and -4 as a new K.
This is to set the address corresponding to -3.

Step 416 is a step of calculating whether y is larger than the other criterion, that is, 7) 0.807. If y is larger, step 417 is selected; if it is smaller, step 418 is selected.

Step 417 determines that y is less than 1.20 and 0
．． This stencil is selected when the size is smaller than 80,
Therefore, this is a step of selecting one of the addresses 7, 8.9 in the relational table of FIG. 6 under the condition that y is smaller than the predetermined range. Therefore, this step is to add 6 to the address contents of K set up to step 414 and set it as a new K.

In step 418, y is 0 in step 416 above.
．． In addition to being 80 or more, it is selected even if stay 7'' 415 or 417 is completed.In other words, step 410 is selected based on x and y calculated in step 407.
- 417, and perform X above.

In this step, an appropriate correction value i based on y is determined and selected, and the reference density ratios g and r obtained in the previous step 404 are corrected using the determined correction value to obtain a corrected reference density ratio. This is the step of obtaining gs=gX11 and rs=rXi.

The above step 418 is completed, and the correction standard density ratio gs +
When rs is obtained, the apparatus is configured to directly perform the same processing as the steps from step 202 described in FIG. 2.

That is, instead of g and r in steps 203 and 207 in FIG.
In other words, processing operations using S+rS are performed.

As a result, even if there is color bias in the observation film,
The state of the bias is detected as a density ratio for an arbitrary color (in the above example, blue was used as the reference), and the reference density ratios g and r, which serve as standards for considering color balance, are pre-corrected reference density ratios based on the above detection results. Since it is set to gs + rs, automatic optimal color balance adjustment can be realized without any problems, that is, without problems such as over-correction of a particular color.

Effects of the Invention As described above, the film image observation auxiliary device according to the present invention supplies part of the light supplied to the video camera via the color correction means to the density measurement means for measuring the large area average transmission density. Shiko's density measuring means detects the density output when a standard film is attached and the optimal color balance is obtained on the monitor television receiver, and the density output when the film to be observed is attached, and calculates the image density output. is compared by the control means, and the color correction state of the color correction means is controlled based on the comparison result, so once the optimum color balance is obtained with the standard film, simply attach the film you want to observe, and the color correction state of the color correction means is controlled based on the comparison result. The optimum color balance for the image can be automatically obtained, and the image of the color still film can be observed on a monitor television receiver via a video camera with an extremely simple operation.

In addition, even if the film you want to observe has color bias, by selecting an appropriate correction value based on the density ratio measurement result using the density measuring device, you can obtain the optimal color balance by attaching a standard film as a reference. Since the density ratio is corrected when the density ratio is changed, it is possible to automatically obtain the optimum color balance of the above-mentioned observation film on the monitor television screen without any problem.

[Brief explanation of the drawing]

FIG. 1 is a schematic configuration diagram of an embodiment Q of the film image observation auxiliary device according to the present invention, and FIG. 2 is a specific example in which the control means 17 indicated by the number 17 in FIG. 1 is configured with a microcomputer. FIG. 3 is a schematic diagram of another embodiment of the film image observation auxiliary device according to the present invention, and FIG. 4 is a flowchart showing a case where the control means indicated by the number 17' in FIG. 3 is constituted by a microcomputer. FIG. 5 is a flowchart showing a specific example of the operation of the apparatus, and FIG. 5 is a schematic diagram of a conventional film image observation auxiliary apparatus, which is the flowchart of FIG. 1... Light source, 4... Diffusion plate, 6...
...Film holder, 7...Mounting configuration, 8
...Video camera, 9...Color correction means, 1o...Condenser lens, 11...
・Half mirror 112...Diffusion plate, 13...
. . . Density measuring means, 14 . . . Color filter group,
15... Optical sensor group, 16... Mu D controller (-ta, 17°1T'... Control means, 18...
... Drive control means, 19 ... Drive means, 2
0... Manual driving means, 21... ND filter, 22... Moving means. Name of agent: Patent attorney Toshio Nakao and 1 other person No. 1
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Claims (3)

[Claims] (1) An auxiliary device used to observe images captured on color still film on a monitor television receiver via a video camera, which emits light containing all the necessary color wavelengths. a first optical system comprising a light source, a color correction means comprising a cyan filter, an agenta filter and a yellow filter, a diffusion plate, a half mirror, etc., and guiding the light emitted from the light source to the video camera; A mounting structure for optically and mechanically connecting the video camera, a density measuring means for measuring a large area average transmission density of the three primary colors of the supplied light, and a density measuring means for measuring the large area average transmission density of the three primary colors of the supplied light, and a density measuring means for measuring the large area average transmission density of the three primary colors of the supplied light, and a second optical system that guides light that is not guided to the video camera to the density measurement means; and a second optical system that moves each filter of the color correction means independently, and a proportion of each filter that is included in the first optical system. a drive means for automatically controlling the drive means and a manual drive means for manually controlling the drive means; a drive control means for controlling the operation of the drive means;
A film holder provided in the first optical system and to which the color steel film is attached, and a standard film containing all hues uniformly attached to the holder, and the density measurement when an optimum color balance is obtained. It includes a storage section that receives the density output from the means and calculates and stores it as a reference density ratio for a predetermined color, and the density ratio obtained by the output of the density measuring means when the film to be observed is mounted on the holder is the reference density ratio. and control means for outputting and supplying a control signal to the drive control means for controlling the color correction means so that both density ratios have a predetermined relationship based on the comparison result. An auxiliary device for observing film images. (2) The control means receives the density output from the density measurement means when the color correction means is removed from the first optical system, detects the density ratio of the predetermined color in advance, and determines the reference density ratio based on the detection result. The film image observation auxiliary device according to claim 1, which includes a correction section that corrects color bias caused by the film to be observed and the first and second optical systems. (3) The control means is equipped with a standard film containing all hues uniformly, receives the three primary color density output from the density measurement means when the optimum color balance is obtained, and calculates the density ratio of green and red to blue. , the first to be stored as the first and second concentration ratios.
a second step of receiving the density output from the density measuring means when the film to be observed is attached and calculating the density output ratio of green to blue as a third density ratio; A third step of comparing whether or not the first density ratio is equal to the third density ratio is selected and the color correction means is selected when the first density ratio is larger or smaller than the third density ratio. a fourth or fifth step of outputting a control signal to control the ratios to be equal; and a fourth or fifth step is selected when the first density ratio and the third density ratio become equal, and when the film to be observed is mounted. a sixth step of receiving the density output from the density measuring means and calculating the density output ratio of red to blue as a fourth density ratio; and whether or not the second density ratio and the fourth density ratio are equal. a seventh step of comparing the second density ratio and controlling the color correction means so that the second and fourth density ratios are equal, selected when the second density ratio is larger or smaller than the fourth density ratio; The eighth or ninth step of outputting a control signal is selected when the second concentration ratio and the fourth concentration ratio are equal, and whether or not the third and seventh steps have been performed a preset number of times. a tenth step of determining whether the step has been performed, and canceling the step operations after the second step if the step has been performed, and selecting the second step and causing the step operation to be performed again if the step has not been performed. Claim 1 consisting of a computer
The film image observation auxiliary device described in 2.