JPS62161143A - Image display device - Google Patents

Abstract

PURPOSE:To prevent previously a defective print due to a misdecision from being generated by displaying an image which has the same color and density as those of a print photography on a color video monitor before printing. CONSTITUTION:A color negative film 1 which is developed is wound around a supply reel 2 in a long state, and this long-sized film 1 is unwound from the payoff reel 2, frame by frame, and taken up around a take-up reel 4 after image surfaces are scanned by a film scanning device 3. A main device body 5 stores a circuit device and performs the image processing of a color video signal read by scanning the long-sized color negative film 1. This image- processed color video signal is sent to a color video monitor 6, which displays plural, e.g. 12 continuous frame of image having the same density and color as those of the print photography. A monitor man observes the color video monitor 6 and inspects whether automatically corrected images of the frames have the proper density and color or not.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an image display device that displays, on a CRT, a plurality of frames of images that have undergone color and density correction according to printing conditions before photographic printing.

At color photo labs, printing is carried out according to the following procedure. That is, a large number of developed color films (color negative films, color positive films) are joined together to make a long color film, and this long color film is loaded into a testing device. Using this film inspection device, a skilled monitor observes the color film and determines the amount of correction to achieve the best color and density of the printed photograph.

Furthermore, recently, the amount of correction is automatically calculated using a color film automatic analysis device.

The correction information determined by the monitor or automatically corrected is recorded on a recording medium such as a paper tape or a magnetic tape. This recording medium and a long color film are loaded into an automatic printer, and a color image is printed on photographic paper by controlling the exposure level based on the correction information read from the recording medium.

The finished printed photo is inspected for proper color and density. If the print is determined to be inappropriate, it is checked against the color film, then the print conditions are changed and the print is reprinted.

Finally, a final comparison is made between the color film and the printed photograph, which is then packaged according to gender and shipped.

In the film inspection, inspection errors occur, and the rate of occurrence of these inspection errors is influenced by the experience and ability of the monitor. Furthermore, if an automatic color film analysis device is used, a skilled monitor is not required. However, although it is easy to judge by humans, it is difficult to judge mechanically (color feria).

Misjudgment often occurs regarding backlight, light source color).

If such a judgment error occurs, the printed photograph will be rejected, resulting in print loss (loss of photographic paper, processing agent, and labor).For defective prints due to this judgment error, Since it is printed again, the verification process and printing process for reprinting become redundant.The cost of loss due to this judgment error is included in the printing fee as part of the cost, which increases the printing cost. .

SUMMARY OF THE INVENTION In view of the above circumstances, it is an object of the present invention to provide an image display device that displays a corrected image for a monitor so as to prevent the occurrence of defective prints due to judgment errors.

Another object of the present invention is to provide a color film verification device that does not require a skilled person with high correction ability and a highly accurate color film automatic analysis device.

The apparatus of the present invention displays an image having the same intensity and density as the printed photograph on a color video monitor before printing. Therefore, since the print image can be viewed on a color video monitor, it is possible to prevent the occurrence of defective prints due to judgment errors.

That is, the monitor person only has to observe the automatically corrected color image and determine only those that have inappropriate density and color balance, and those that are out of focus and do not need to be printed. This allows the monitor person to operate the manual operation input section and manually correct things that are difficult to correct mechanically (color feria, backlighting, light source color, etc.). Printed photographs of excellent quality can be obtained even without a highly accurate automatic color film analysis device. In addition, the verification processing speed is greatly improved compared to the method of manually correcting all frames.

Furthermore, a preferred embodiment of the apparatus of the present invention is characterized in that a plurality of consecutive frames are displayed on a color video monitor. Generally, the same or similar scenes are often recorded in adjacent frames, and it is desirable that these same or similar scenes be finished in the same way. Since a plurality of frames are displayed in the apparatus of the present invention, the same or similar scenes can be finished in the same way by performing comparative evaluation.

In addition, when it comes to film that has aged in a very peculiar manner, the amount of correction cannot be predicted even by experienced and highly skilled monitors, so in some cases, only the first frame is printed and corrections are made in the so-called re-burning process. There are many. If you use this device,
Since the image according to the correction values is displayed directly on the CRT, the finished quality can be easily predicted in advance.
The above-mentioned re-baking process becomes unnecessary.

Hereinafter, embodiments of the present invention will be described with reference to screens.

In FIG. 1 showing the appearance of the apparatus of the present invention, a developed color negative film 1 is elongated and reeled onto a supply reel 2.
is wrapped around. This long color negative film 1
is pulled out one frame at a time from the supply reel 2, the screen is scanned by the film scanning device 3, and then wound onto the take-up reel 4.

The device main body 5 houses a circuit device that will be described later.
A long color negative film 1 is scanned and a nollar video signal read is subjected to image processing. This image-processed color video signal is sent to a color video monitor 6. The color video monitor 6 displays a plurality of frames, for example, 12 consecutive frames, having almost the same density and color as the printed photograph.

The monitor person monitors the color video monitor 6 and verifies whether the automatically corrected images of each frame have appropriate density and color. For inappropriate ones, the manual operation input device 7 is operated to manually set the correction amount. If manual correction has been performed, the corrected image will be displayed.

Furthermore, since it is useless to print blank dances or out-of-focus data, information that does not need to be printed is input from the manual operation input device @7. The automatically corrected correction amount or manually corrected correction amount, and information such as whether printing is unnecessary are recorded on a recording medium 9 such as a magnetic tape or a paper tape outputted from the output device 8.

FIG. 2 is a block diagram showing the configuration of the apparatus of the present invention.

The film scanning device 3 includes a light source 10, lenses 11, 12,
A color television camera 13 scans each frame of the long color negative film 1 to generate color video signals of three colors: blue, green, and red. This film scanning device 3 includes a flying spot scanner device and 3
A combination of a dichroic filter that separates colors into each other and three photomultis; A combination of a linear illumination light source, a continuous film transport device, a dichroic filter, and a line sensor: A light source, a rotating disk with small holes, and a dichroic filter It is also possible to use a combination of and photomultiple.

The frame feeder 14 sets each frame of the long color film 1 at a predetermined position in response to a frame feed command from the computer 15.

The A/D converter 16 converts the blue, green, and red color video signals sent from the color television camera 13 into six to eight
Converts to bit digital color video signal.

The color film automatic analysis device 17 inputs the color video signal from the color television camera 13, temporarily stores it in the memory, reads it out, and calculates LATD (Large Area Average Transmission Density), hue of LATD<LATDa, LA.
TD (T, LATDR), upper ATD, lower LAT
Extract θ, maximum value, minimum value, number of skin colors, number of red colors, number of green colors, number of blue colors, number of yellow colors, average value of skin color, etc. using analog or digital calculations, and use these characteristic values to create a pattern. Classified by (those that cause color feria, those photographed under tungsten light, those photographed under fluorescent light, sunsets, morning suns, photographs that have aged, normal photographs, etc.)
Calculate the amount of color and density correction according to the picture. Regarding the color film automatic analysis device that calculates this correction m, please refer to Japanese Patent Application No. 53-99906 filed by the present applicant.
99907@, 99908 issue, 99909 bow,
No. 99910, 99911@, 99912
No. 103571.

The frame memory stores data for one screen of the color video monitor 6, and stores data for one screen of the coloring video monitor 6.
8a, 18b, green frame memory 19a, 19
b, and red frame memories 20a and 20b. The reason why two frame memories are provided for each color is to enable film scanning and display to be performed in parallel. ``This frame memory stores a plurality of frames of color video signals in a predetermined memory area in accordance with the synchronization circuit 21 and an area control signal from the scan area control circuit 22.

Switches 23a to 23c are switches for specifying frame memories to be written to, and switch memories 24a to 2
4c is for specifying the frame memory to be read. These switches load the digital video signal into one of two frame memories provided for each color, and read out the digital video signal from the frame memory being used.

The table lookup memory is composed of a table lookup memory 25 for blue, a table lookup memory 2G for green, and a table lookup memory 27 for red, and performs a table lookup of the color video image of each color read from the frame memory. , generates a color- and edge-corrected positive color video signal.

If the γ of the entire system is T, the film γ is F, the photoelectric conversion γ is rP, the CRT γ is CIIT, and the table lookup memory γ is [, then the following equation holds. .

"Ding = rF Xrp Xrc Rr XrL ・
-11) In equation (1), rF--0,6 rP=i.

If we set rcRv-2,2 and γ of the entire system as the ideal value "T-1,0," then rL-rT ÷ (rp xrP xrc RT )-
1,O÷(-0,6x 1.Ox 2.2>÷-0,
If -0,76 of 7 is taken as the standard γ value (-γ8), the conversion table value is expressed on the Terumaro scale as shown in FIG.

The standard γ conversion table value shown in FIG. 3 represents the conversion rate when converting a negative into a positive, and this value is stored in the memory of the computer 15. Note that since F is different depending on the type of film and whether it is for negative or positive use, it is best to store the e=tpγ conversion table values for each case in the computer and select the desired table value according to the film used. desirable.

This standard γ conversion table value is corrected according to the correction amount calculated by the color film automatic analysis device 17.

Let the average transmittance of a certain frame be the king, and let the correction amount be α, then
In a photographic print system, the average transmittance is the same as that on a print with a constant density. When this is applied to the system of the present device, the gain is corrected so that the input transmittance To becomes constant.

That is, if the input gain is A, To-A・αT O ,', A −□ ・・・・・・
(It becomes 2α-cho.

If the input value at the measurement point is X' and the table value is x, then G−f (x) −・・・−
(3).

Therefore, the gain G obtained according to the correction amount α is the standard γ
All you have to do is multiply the conversion table value.

Therefore, the computer 15 uses the formula (3) for each color of each frame.
), and the obtained γ conversion table values for each color are sent to the table lookup memories 25, 26, and 27, respectively, and the table values are rewritten.

In reality, the table lookup memories 25 to 27 are frame 181. : A high-speed RAM group provided is used, and the area control signal selects the one storing the γ conversion table value of the frame.

The color video signal subjected to table conversion at high speed by the table lookup memories 25 to 27 has the same degree and color information as the printed image. This color video signal is input to D/A converters 28-30 and converted into an analog signal. This analog color video signal is sent to a color video monitor 6. The color video monitor 6 displays 12 continuous frames of positive images on a CRT screen.

The manual operation input device 7 includes, as shown in detail in FIG. Equipped with an oyster with a special function.

In this faction input key, "→" is a key that indicates that the correction is the same as the previous frame, "NJ" is a key that indicates cases where printing is unnecessary, such as out of focus, and rFLJ is a key that indicates that the correction is the same as the previous frame. This indicates that the image was decoyed under fluorescent light, rTJ indicates that tungsten light is used, r l-I J specifies high correction mode, and "L" indicates Specifies the 1-coward collection mode. "○ [1t]" is the print information specified in the manual or the color film itself! This is for outputting the print information calculated by the II analysis device 17 to the recording medium 9.

Computer 15 performs sequence control of the entire system, calculates modified γ conversion table values, and transfers them to table lookup memories 28-30 at high speed. Further, the correction amount calculated by the color film automatic analysis device 17 or the correction amount input from the manual operation input device is stored and transferred to the output device 8.

The scan area control circuit 22 is a synchronization circuit 21
The frame memory and the memory areas of the table lookup memories 25 to 27 are designated by the synchronization signal from the sync signal, and the color video monitor 6 is controlled so that a plurality of frames are displayed.

Next, the operation of the above device will be explained.

The computer 15 includes switches 23a to 23c,
24a to 24c are switched to select one of the two buffer frame memories. In FIG. 3, for example, the mode is set to include the frame memory 18a77i1, and the mode is set to the frame memory 181)7J'l output mode.

When a frame advance command is output from the computer 15,
A frame feeder 14 feeds the long color negative film 1 one frame and sets the frame at a scanning position.

When this frame advance is completed, the computer 15 increments the frame counter and sends the contents to the scan area control circuit 22. The scan area control circuit 22 specifies an area to be stored in the frame memory.

When a scanning start command is output from the computer 15, the film scanning device 3 starts scanning the screen and scans blue, green,
Generates a three-color red video signal. This color video signal is sent to the color film automatic analyzer 17 and the A
/D converter 16.

The color film automatic analysis device 17 starts sampling in response to a sampling clock signal from the synchronization circuit 21, and captures the video signal at a predetermined measurement point into a memory. Further, the A/D converter 16 converts the color video signal into a digital signal using the sampling clock signal.

The color film automatic analysis device 17 obtains characteristic values such as LATD, m-population, and the number of minimum skin colors from data for one frame, and calculates a correction amount for LATD from these characteristic values. This correction amount is sent to the computer 15 and stored.

When the calculation of the correction amount is completed, the computer 15 terminates (
ffi number to the computer 15. The computer is
After receiving this end signal, a frame advance command is issued to advance the film one frame.

When scanning for the prescribed 12 frames is thus completed, a frame memory switching command is issued to select another buffer, for example 18b. At the same time, clear the frame counter,
Another 12 frames are scanned and the data is reloaded using the procedure described above.

Next, the read mode will be explained. In this embodiment, since the frame memory is provided with 2 buffers 7, 1) η
Processing is performed in parallel with the above-mentioned occupation mode (film scanning, film analysis, frame memory writing).

=1 viewer 15 is color film automatic analysis device 1
A gain G is obtained according to the correction amount for each frame calculated in step 7, and the standard .gamma. conversion table value X-- is multiplied by this gain G to obtain the .gamma. conversion table value. This γ conversion table value is calculated using the blanking period of the color video monitor 6.
Write to the area corresponding to a given frame in table lookup memory.

Color video signals for 12 frames recorded in the frame memory are sequentially read out and sent to the table lookup memory. This table lookup memory is
The area corresponding to each frame is selected by the area control number S, and γ conversion is performed using the table value corresponding to the frame.

Through this γ conversion, a positive image color video signal with density and color correction is obtained. Color video signals that are γ-converted at high speed using the table lookup method are divided into D/
The signals are sent to Δ converters 28 to 29, where they are converted into analog signals. This analog color video signal is sent to a color video monitor 6, and a 12-frame print image is displayed on a CRT.

J5 When displaying on this monitor, it is desirable to display correction groups such as density keys, color keys, etc. in the extra space of each frame.

The monitor man checks the color image displayed on the monitor 1I1.
2, and determines what is inappropriate for correction and what is useless even if printed, such as out-of-focus images.

If the correction is inappropriate, specify the frame using the display address input key, and then manually correct it by operating the density and color correction input keys. Also, for out-of-focus images,
Press the cat function key to indicate that printing is not required.

These correction information are input to the computer 15, and the γ conversion table value of the corresponding frame table lookup menu is automatically changed according to the correction period. and,
The color video signal is γ-converted using this new table value and displayed on the color video monitor 6.

When the verification of all displayed frames is completed,
If you press the routJ key, the data of the automatically calculated correction amount or the correction amount specified manually will be transferred to the recording medium 9.
After that, new 12-frame print images are displayed on the color video monitor 6.

In the above embodiment, the computer 15 performs the multiplication of equation (3), and the multiplication result is read into the table lookup memory. Alternatively, as shown in FIG. 5, it is also possible to provide a high-speed digital multiplier 40 and use this multiplier 40 to set the gain. In this method, standard gamma conversion table values are written in a table lookup memory, and the table lookup memory performs the standard gamma conversion, while the digital multiplier 40 performs density and color correction.

FIG. 6 shows an example using a high-speed analog multiplier,
In this case, the multiplier 41 is arranged after the D/A converter 28, for example.

Since the present invention having the above configuration displays a print image on a color video monitor before printing, it is possible to prevent judgment errors from occurring, thereby reducing print loss.

Furthermore, since an automatic color film analysis device is provided to display automatically corrected print images, processing capacity is greatly improved compared to a system in which correction levels are determined entirely manually. Furthermore, since automatic correction corrects inappropriate images, it is possible to obtain high-quality printed photographs without the need for a highly skilled person or a highly accurate color film automatic analysis device.

Furthermore, since a plurality of consecutive frames are displayed simultaneously on a color video monitor, corrections can be applied to similar scenes so that they are printed under the same conditions.

Furthermore, since a table lookup memory is used, γ conversion can be performed at high speed, thereby making it possible to display a plurality of frames without any trouble.

[Brief explanation of drawings]

Fig. 1 is a front view of the present invention, Fig. 2 is a block diagram of the entire system, and Fig. 3 is a standard γ'! ! A graph showing table values in exchange,
FIG. 4 is a plan view showing input keys of the manual operation input device, and FIGS. 5 and 6 are block diagrams of essential parts showing an embodiment provided with analog and digital multipliers. 1... Long color negative film 3... Film scanning device 6... Color video monitor 7... Manual operation input device 8... Recording medium 9... Output device 13...
・Brevi camera 14...Frame advance device 15...
・Computer 16...A/D converter 17...
・Color film automatic analysis device 18a, 18b, 19a
, 19b, 20a, 20b-...Frame Esu 21.
...Synchronization circuit 22...Scan area control circuit 25-21
...Table look thick butt 28-30...D
/A converter 40...High-speed digital east exit unit 41...High-speed analog multiplier Fig. 1 Fig. 3 Input transmission control 1゛0 Fig. 4 Fig. 5 Fig. 6

Claims (1)

[Scope of Claims] 1) An image modification means having an image display means and an image conversion section, and a gradation conversion table f(x) prepared for a digitized display image signal; Calculating G·f(x) based on the gain G obtained from the luminance correction amount α input from the means, and transmitting the calculated value G·f(x) to the lookup table of the image converting unit, An image display device characterized in that the display image signal is converted by the lookup table, and the converted output is displayed on an image display means via a D/A converter. 2) The screen of the image display means is divided into a plurality of screen parts, and a number of lookup tables corresponding to the number of screen parts are prepared for each of these screen parts, and each lookup table functions as the image correction means. An image display device according to claim 1, characterized in that: