JPS62294236A - Principal picture display device - Google Patents

Abstract

PURPOSE:To accurately detect a flesh color by preliminarily defining the flesh color of a person and referring to this definition to obtain a flesh-colored part and displaying this part with a high luminance on a monitor. CONSTITUTION:Data in a flesh color memory part 70 which defines the range of flesh color and three-color densities of each picture element stored in a RAM 45 are sent to a principal picture discriminating part 71, and it is discriminated whether each picture element is flesh-colored or not. Discrimination results f the discriminating part 71 are sent to a picture area determining part 72, and data which indicates whether each picture element is flesh-colored or not is written as a binary signal. A write and read control part 73 controls write and read of memories 74a-74c provided for individual colors and data read of a picture area table in the determining part 72. At the time of monitor, color video signals stored in memories 74a-74c are read out and are sent to an amplifying circuit 78 through a D/A converter 77. Data read from the picture area table in the discriminating part 72 is inputted to the circuit 78 as an amplification factor adjusting signal, and the flesh-colored part is amplified more than a background part to display the flesh-colored part on a CR 50 as a high-luminance color picture, thus accurately detecting the flesh color.

Description

Detailed Description of the Invention 3. Detailed Description of the Invention [Field of Industrial Application] The present invention is used in a photo printing device, a preliminary negative verification device for photo printing, etc., and is used to monitor the main image of a color original. The present invention relates to a display device.

[Conventional technology]

-In terms of color original images such as color negative film and color positive film, in addition to frames with an appropriate negative image exposure, there are also frames with an extremely underexposed negative image and extremely overexposed negatives. Contains frames of images, frames of negative images with high contrast, etc. Even with such negative images, when printing a photograph, the amount of blue, green, and red exposure must be controlled to ensure that the printed photograph has the appropriate color balance and density. There is. A common exposure control method measures the average transmitted luminance (LATD) of the screen for each color, and
This is an LATD method that controls the exposure amount of each color depending on the color.

A normal color original image includes not only the intentionally photographed part (the main image) but also the background image located behind it. Most of these main images are people's faces, so
If the density and color balance in this area are good, the printed photograph is often considered to have a good finish. By the way, the method using LATD mentioned above controls the exposure so that the integrated color of each color is finished as gray, but this rule of thumb holds true for background images that include landscapes, etc. be. Therefore, in the LATD method,
Depending on the scene, the finish of the main image may not be good.

In order to solve the problems of this LATD method, there is a known method that detects the skin tone of a positive image from the color original image and controls the printing exposure so that this area is finished with a desirable skin tone on the printed photograph. (For example, U.S. Pat. No. 41
No. 76946). There is also a known device that manually specifies a main image, measures the image characteristics of this main image, and corrects the exposure amount by LATD (Japanese Patent Publication No. 55-
No. 29412).

[Problem that the invention seeks to solve]

The above-mentioned system that automatically detects skin-tone areas may misidentify this as a person's skin if the original color image contains a wall or other object that resembles a person's skin color, or the film characteristics may change over time. Depending on the change or the photographing light source, gray may also be treated as skin color >t=, but conventional devices have not been able to effectively deal with such misidentifications. Furthermore, in the method of manually specifying the main image, it is necessary to specify the main image for each frame, which causes a problem that the operation is troublesome.

[Means for solving problems]

In order to solve the above problems, the present invention provides means for measuring the three-color density of each point of a color original image, a storage means for storing data defining a skin color range in a positive image, and a storage means for storing data defining a skin color range in a positive image. a determining means for comparing the measured value with the data in the storage means to determine whether each measurement point is a skin color; an image displaying means for displaying the color original image on a monitor; The image display apparatus is provided with a control means for controlling the image display means and causing the image display means to display a skin-colored area in a manner that is distinguishable from others.

That is, the present invention measures the three-color density of each point of a color original image, and determines whether each measurement point is a skin color by referring to data that defines the skin color range in a positive image. According to the determination result, the corresponding portion of the image displayed on the monitor is displayed in a distinguishable manner.

In addition to providing the three-color density measuring means and the image display means for a monitor independently, it is preferable that some of them be used in common.

For example, a color TV camera may be used, the obtained three-color video signals may be sent to an image display means for display on a monitor, and three-color density signals may be created from the three-color video signals. In addition, as an image display means, C
An RT or liquid crystal display device or the like is used. These image display means should preferably be capable of color display, but may also be of black and white display in order to reduce costs.

The operator observes the image display means to confirm whether the automatic judgment is correct or not. If a judgment error has occurred, the operator manually specifies the skin color portion and corrects the display. This manual specification can be performed using the keypad-mounted touch panel sensor 9, a light pen, a mouse, or the like. This automatically determined or manually specified skin color portion is recognized as the main image and used during exposure calculation. As a result, the exposure amount is determined so that the main image is well-finished on the printed photograph.

Embodiments of the present invention will be described in detail below with reference to the drawings.

〔Example〕

FIG. 1 shows an example of a photographic printing apparatus embodying the present invention. The white light emitted from the white light source 10 is transmitted to the diffuser tube 11. Passing through the negative carrier 12, the color original image, for example, a color negative film 13 set at the printing position, is reached.
Light this from below.

The diffusion tube 11 is a rectangular tube 14 whose inner surface is formed into a mirror surface.
and two diffusion plates 15 fixed to both ends thereof. A cyan filter 16 for adjusting the red component of illumination light and a magenta filter 1 for adjusting the green component are provided between the diffusion tube 11 and the white light source 10.
7, and a yellow filter 18 for adjusting the blue component.
and are arranged. The filter adjustment unit 19 adjusts each color filter 16 to
The amount of insertion of the 18 beams into the optical path 20 is adjusted. For example, if the amount of insertion of the cyan filter 16 is increased, the red component of the illumination light will be reduced, and the amount of red exposure will be reduced. The color negative film 13 is pressed down from above by a mask 21 operated by a solenoid (not shown) during photographic printing.

A lens 24 is arranged above the color negative film 13, and a color negative image is formed on a color photographic paper 26 while the shutter 25 is open. The shutter drive unit 27 opens the shutter 25 for a certain period of time to provide a standard exposure time. Further, when printing of one frame of the color photographic paper 26 is completed, the exposed portion is wound onto the take-up reel 28, and at the same time, the unexposed portion is pulled out from the supply reel 29.

A mirror 32 is pivotally disposed in the optical path 20, and is tilted at 45 degrees with respect to the optical path 20 as shown by the solid line during monitor display, and is retracted to the position shown by the two-dot chain line during photo printing. The light reflected by this mirror 32 is
After passing through a lens 33, it reaches a half mirror 34. The light transmitted through the half mirror 34 enters the sensor unit 35, and the light reflected downward enters the color TV camera 36.

The sensor unit 35 includes a lens 371, a color filter 38. The image sensor 39 outputs three color signals (red, green, blue) of each pixel of a color negative image independently or in a minxed state for each color. The three color signals taken out from the image sensor 39 are A/
It is converted into a digital signal by the D converter 40, then converted into a concentration signal by the logarithmic converter 41, and then sent to the I10 port 42.
The data is taken into the microcomputer 43 via the microcomputer 43. In this embodiment, in order to reduce costs, one image sensor is used to extract three-color signals from each pixel (measurement point), but instead of this, three-color signals of red, green, and blue are used.
A plurality of image sensors may be used. In addition, color T
If the color video signal output from the V camera 36 is used, the sensor unit 35 can be omitted.

As is well known, the microcomputer 43 has an I1
0 boats 42. CPU44. RAM45°ROM 46
It is composed of , and performs exposure amount calculation and control of various parts, which will be described later. The RAM 45 separates the captured color density signals for each color and stores them in the frame memory sections 453 to 45c, respectively.

The color TV camera 36 captures a color negative image and outputs a video signal. This video signal is converted into a positive image video signal by a negative/positive converter 48, and then
It is sent to the controller 49. This controller 49 displays a positive image 51 on the display surface of the color CRT 50, and also inputs a signal from the microcomputer 43 so that the skin-colored part of the automatically determined positive image, that is, the main image, is changed to the non-skin-colored part, that is, the main image. Display the skin color part with high brightness so that it can be distinguished from the background image.

When automatically detecting skin-colored areas, walls, etc., may be mistakenly recognized as skin-colored areas. In this case, it is necessary to manually specify the skin color portion. Therefore, position specifying means, for example, a light pen 53, is provided for observing the positive image 51 and specifying the skin color portion. When a designated point on the color CRT 50 lights up, the light pen 53 photoelectrically converts it and sends a signal to the position detection section 52. Since position information from the controller 49 is input to the position detecting section 52, when a signal from the light pen 53 is generated, the coordinate position on the color CRT 50 is sent to the microcomputer 43. In addition to a light pen, a touch panel sensor, joystick, trackball, XY cursor, etc. can be used as the position specifying means.

The keyboard 55 includes a numeric keypad, an input key 56 for density and color correction, a reset key 57, and a printing start key 5.
8 is provided. The reset key 57 activates the color CRT 5 even though there is no flesh-colored portion.
This operation is performed when a skin color portion is displayed at 0.

FIG. 2 shows an image sensor.

The image sensor 39 includes a photoelectric conversion unit 63 for blue color having a blue filter arranged on the light receiving surface. A green photoelectric conversion unit 64 with a green filter arranged on the light receiving surface. Red photoelectric conversion units 65 each having a red filter arranged on the light receiving surface are alternately arranged in a matrix at a constant pitch. Of this matrix, a pixel measurement unit 66 is configured to measure one pixel of a color negative image using 3×3 photoelectric conversion units. This pixel measurement 66 is surrounded by a dotted line.

When reading out the signals from each photoelectric conversion section, signals of the same color within the same pixel are added and read out, or the color signals are read out in a mixed form and the microcomputer 4
3 and then perform addition within the pixel and then store it in the RAM 45. In this embodiment, since the photoelectric conversion sections of the same color are appropriately scattered within the pixel measurement section 66, the occurrence of color registration can be considerably reduced. Simply, the pixel measurement section may be configured with three photoelectric conversion sections arranged in a row horizontally or vertically, or three photoelectric conversion sections forming a triangle.

It is convenient if the number of pixel measuring units 66 is set to be the same as the number of pixels of the color image displayed on the monitor, since the automatically determined skin color area and the monitor image match. Note that when the number of pixels in the pixel measuring section 66 is small, interpolation processing may be performed so that the number of pixels becomes the same, and then this may be written into the memory. In this case, since the number of pixels is small, the boundaries of the flesh-colored portion displayed on the color CRT 50 will be jagged.

FIG. 3 shows the functions of the microcomputer. The skin color memory section 70 stores data defining a skin color range. This skin color can be defined, for example, by a hatched ellipse in two-dimensional coordinates centered on the difference between two color densities, as shown in FIG. For convenience, FIG. 4 shows the skin color in a positive image. Conveniently, it can be defined as a rectangle with sides parallel to the axis in two-dimensional coordinates.

The data in the skin color memory section 70 and the three color densities of each pixel stored in the RAM 45 are sent to a main image determination section 71, where skin color determination is performed for each pixel. This skin color judgment is based on the three-color density measured on the negative or the HM "4"
Since this is done using the difference in density between the two colors, the actual color on the negative corresponds to the color on the positive image (complementary color). In the following description, the invention will be explained using colors on a positive to make it easier to understand. The definition of skin color and the method of detecting skin color pixels are described in, for example, Japanese Patent Laid-Open Nos. 52-156624 and 1983.
It is described in detail in No.-145620.

The determination result of the main image determination section 71 is sent to the image area determination section 72.
Data indicating whether the color is skin color, for example, a binary signal of "1" if the color is skin color, and "0" if the color is not skin color, is written. This image area determining section 72 is composed of an image area table having an address corresponding to each pixel. Furthermore, in case of a misjudgment, the position of the main image is indicated using the light pen 53. When this manual designation is performed, the automatically detected data is automatically cleared, and the data from the position detection section 52 is written into the image area table. Furthermore, if a skin-colored portion does not exist, operating the reset key 57 clears the data in the image area table.

The write/read control unit 73 uses a memory 74 provided for each color.
Writing and reading of a to 74c and image area determining unit 72
Controls the successive output of data in the image loading table. The memories 74a to 74c carry out negative/positive conversion processing, image processing, and color video signals (R
, G, B) are written. This image processing includes T correction and color correction, which are performed by an image processing circuit 75, and A/D conversion is performed by an A/D converter 76. During monitoring, the color video signals stored in the memories 74a to 74c are read out, converted into analog signals by the D/A converter 77, and then sent to the amplifier circuit 78. This amplification circuit 78 changes the amplification factor in two stages according to the data read out from the image area determining section 72. The color video signal in which the skin color portion is amplified to a greater extent than the background image is sent to the color CRT 50 via the driver 79, and a color image 51 with the skin color portion having high brightness is displayed on the color CRT 50.

When the burning start key 58 is operated, the image area determining section 72
The positional information of the main image and the background image read from is sent to the average color density calculating section 82, where the average color density is calculated. The average color density calculation unit 82 is composed of a main image average color density calculation unit 83 and a background image average color density calculation unit 84, and calculates the average density of each color for each image.

That is, the average color density calculation unit 83 reads out the color density of each pixel constituting the main image from the RAM 45, calculates the red average density, green average density, and blue average density, respectively, and similarly calculates the average color density. The density calculation unit 84 calculates the average color density of the background image. This average color density is the arithmetic mean value obtained by adding the color density of each pixel and dividing it by the number of pixels,
An intermediate value between the maximum value and minimum value within the image is used.

The average color density of each image is calculated by a gray density difference calculation unit 85 to calculate a gray density difference used as scene classification information.
sent to. Here, for each image, the red average density, green average density, and blue average density are added to calculate the average value (gray density value), and then the difference between the two gray average densities is calculated.

The feature calculation unit 86 calculates the feature used in the exposure calculation formula from the color density of each pixel stored in the RAM 45, sends it to the exposure calculation unit 87, and uses the selected exposure calculation formula. Substitute blue exposure.

Calculate the green exposure amount and the red exposure amount, respectively. The calculated exposure amount signals for each color are sent to the filter adjustment section 19, and the insertion amount of each of the color filters 16 to 18 into the optical path 20 is adjusted.

As the exposure amount calculation formula, for example, Japanese Patent Application Laid-Open No. 52-239
36, No. 54-28131, or extreme value information (maximum value, minimum value), 1-screen position average circularity information (upper half or lower half of the screen), histogram information, etc. as feature quantities. The exposure N amount calculation formula is used. Further, the average density of the main image and the average density of the background image may be added to these exposure calculation formulas as feature quantities.

FIG. 5 shows a procedure for exposure control, and the operation of the photographic printing apparatus shown in FIG. 1 will be briefly explained with reference to FIG. Before the start of printing, each of the color filters 16 to 18 is evacuated from the optical path 20, and the mirror 32 is inserted into the optical path 20. The white light emitted from the white light source 10 in a dimmed state is sufficiently diffused when passing through the diffusion tube 11, and then illuminates the color negative film 12 from below.

The light transmitted through this color negative film 12 is transmitted through the lens 2
4. After passing through a mirror 32, it reaches a half mirror 34. The light transmitted through this half mirror 34 is incident on a sensor unit 35, and the reflected light is incident on a color TV camera 36.

The sensor unit 35 scans the color negative image, measures the three color components of each pixel, and generates a color signal for each pixel. This color signal is digitally converted and logarithmically converted, and then written into the RAM 45 of the microcomputer 43 in a separated state for each color. Also, color TV
The color video signal output from the camera 36 is a negative
After positive conversion, it is sent to the controller 49. This controller 49 performs image processing and digital conversion on the color video signal, and then writes the signal into memories 74a to 74c provided for each color. This memory 743-74
Writing and reading of c is controlled by a writing/reading control section 73. The color video signals read from each of the memories 74a to 74C are digitally converted, signal amplified, and then sent to the driver 79. This driver 79 drives the color CRT 50 to display a positive image 51 on its display surface.

After capturing the three-color density signals, the microcomputer 43 automatically detects skin-colored pixels.

That is, with reference to the skin color definition written in the skin color memory unit 70, it is determined from the three color densities of each pixel read from the RAM 45 whether it is a skin color. This determination result is sent to the image area determination unit 72, and "1" is written in the image area table if the skin color is obtained, and "0" is written otherwise.

The write/read control section 73 has memories 74a to 74.
c and the subsequent output of the image area table are performed at the same time. The color video signals read from the memories 74a to 74c are digitally converted and then sent to the amplifier circuit 78.

Data read from the image area table is input to this amplifier circuit 78 as an amplification factor adjustment signal, so when data "1" indicating skin color is input, color video signals of each color are input. greatly amplified. As a result, in the positive image displayed on the color CRT 50, the automatically determined skin color portion has a higher brightness than the surrounding background image. FIG. 6 shows this state, in which the hatched part of the face is determined to be skin-colored and has high brightness so that it can be identified.

Observing the positive image displayed on the color CRT 50,
Check whether the skin part of the person is correctly determined and whether this part has high brightness.

If the human skin part has high brightness, automatic detection of the main image has been performed correctly, and at this time, the printing start key 58 is pressed as will be described later.

On the other hand, if the area with a high degree of vaginism is, for example, a wall, the main image may be misidentified, and in this case, use the light pen 53 to trace the outline of the skin-colored area.
Enter the skin color part manually. The coordinate position of the manually designated skin color portion is detected by the position detection section 52, and is sent to the image area determination section 72, where the data is rewritten.

This new data is read out by the write/read control unit 73 and sent to the amplifier circuit 78, so the color CRT 5
0, the manually specified portion is displayed with high brightness. Further, there is a case where a skin-colored portion is not present due to an erroneous recognition of the automatic detection, but in this case, the reset key 57 is operated to clear the data in the image area determining section 72.

In this case, the color image displayed on the color CRT 50 has no high brightness portion.

After automatic detection of the main image or manual instruction, if the printing start key 58 is turned to ○N, the mirror 32 is retracted from the optical path 20 and the white light source 10 emits full light. Also,
The average color density calculation unit 82 operates, refers to the data stored in the image area table, and divides the three color densities of each pixel read from the RAM 45 into a main image and a background image.

The image feature amount of the main image is calculated from the three color densities of the pixels that make up these main images, and the image feature amount of the background image is extracted from the three color densities that make up the background image.

Scene classification is performed from each image feature layer obtained, and an exposure calculation formula prepared in advance for each scene is selected.

The exposure amount for each color is calculated by substituting feature amounts for exposure control into the selected exposure amount calculation formula. According to the calculated exposure amount of each color, color filter 1 of its complementary color is applied.
6 to 18 are retracted from the standard position or further inserted toward the center of the optical path 20 to adjust the trichromatic light components of the printing light.

Next, the shutter 25 is opened for a certain period of time, and the color negative image is printed onto the color photographic paper 26. After this printing, the color photographic paper 26 and the color negative film 13 are fed by one frame. Along with this, the filter adjustment section 19
returns the color filters 16 to 18 to their standard positions in the optical path 20 and dims the white light source 10. When this new frame is set in the printing position, the main image is automatically detected again as described above, and the main image is displayed based on the automatic detection.

In the embodiment described above, the color filters 16 to 18 are used to adjust the exposure amount of each color to create a printed photograph with good density and color balance. However, depending on the color negative image, the color filters 16 to 18 may not be able to fully correct the image. All you have to do is adjust the amount of insertion. In addition, in the exposure calculation formula, the color correction amount is calculated and the color filters 16 to 18 are controlled, and the exposure amount is inappropriate (over negative image).

(under negative image, backlit negative image), the density correction amount may be calculated separately, and the exposure time of the shutter 26 may be extended or shortened from the standard exposure time.

Next, the flowchart shown in FIG. 5 will be explained in detail with reference to FIGS. 7 and 8. In FIG. 7, with reference to the determination results stored in the image area table, the color density of each pixel sequentially read out from the RAM 45 is divided into a main image and a panoramic image. Then, within each image area, density values are added for each color and the number thereof is checked. Here, Dl is the density of pixels forming the main image, and D2 is the density of pixels forming the foreground image. Further, i represents an individual pixel, and j represents a color. j=1 is red, j=2 is green, and j=3 is blue. N1 is the number of pixels included in the main image area, and N2 is the number of pixels included in the threatening scene image area.

Since the density value added for each color in each area is divided by the number,
The average color density of the main image area and the average color density of the background image area are calculated. This average color density has a horizontal bar above the symbol. Gray densities DW, , DW2 are calculated from the average color densities thus obtained, and the difference ΔD between these is used as scene classification information.

FIG. 8 shows an example of scene classification.

Scenes are roughly classified into two types depending on whether a skin-colored portion is present or not. Next, if a skin-colored part exists, Δ
Subdivide based on the size of D. The subclassification by this ΔD is
-0, less than 10, -0,10 to less than 0.05, 0.0
5 to less than 0.20.

It is carried out in four stages of 0.20 or higher. Based on these classifications, one of the exposure calculation formulas F1 to F5 is selected.

The following is used as the exposure amount calculation formula F1,
The exposure amount is calculated for each color using the feature amount of that color, and the color filters of the corresponding color and complementary color are adjusted respectively. Here, j represents any one of red, green, and blue.

Xj = −3,59+ (3,7XDFMXJ)+
(1,8xDFMIj)-(3,7xDCAj)+
(1,1xDCMXJ)+(0,5xDCMIj)-(
1,OXDLWAj')+(1,IXDLWX,)-
(0,8xNHCNJ)-(2,3xNLCN,)+(
0,5×N5DJ)−(0,6×NGRAM) The feature amounts used in the exposure calculation formula are as follows.

DFMXj: Maximum density of the entire screen DFMI, minimum density of the entire two sides DCAj: Average density at the center of the screen DCMXJ Maximum density at the center of the two sides DCMIj: Minimum density at the center of the screen DLWAj:
Average density in the lower half of the screen DLWXJ Maximum density in the lower half of the two sides NHCNj: 0.8 x (DFMxJ - DFMl,)
+DFM! , the number of pixels with density greater than NLCNj:
0.2 x (DFMXJ-DFMIj) 10DFMI, the number of pixels with a density smaller than The coefficients are changed depending on the situation. Of course, an exposure amount calculation formula using another feature amount may be used.

In addition, the exposure amount calculation formulas F1 to F5 are calculated as the negative color or the average exposure amount of the three colors, without calculating each of the three colors, and the exposure amount is calculated based on the color balance amount of the three colors calculated by another method. may be determined.

In the above-described embodiment, the main image, which is a skin color, is displayed with high brightness, but the main image portion may be made to blink instead. FIG. 9 shows the main parts of this embodiment, and the same parts as shown in FIG. 3 are given the same reference numerals. A gate 91 is provided between the image area determining section 72 and the amplifier circuit 90, and is opened and closed by a timer 92 at predetermined intervals, for example, 0.5 seconds. As shown in FIG. 10, during the period when the gate 91 is closed, the main image and the background image are amplified by the same amplification factor, and the gate 91 is closed.
During the period when 1 is open, the amplification factor of the main image is smaller than that of the background image, and becomes zero, for example. This causes the main image to blink on the color CRT 50.

Although the above-mentioned embodiment is a photographic printing apparatus, the present invention can also be used in a negative pre-verification apparatus.

In this case, of course, the color filters 16 to 18
．． Shutter 25. Color photographic paper 26 and the like become unnecessary. FIG. 11 shows an embodiment in which the present invention is applied to a negative pre-verification device, and only the parts different from FIG. 4 are shown.

The negative pre-verification device detects negatives that cannot be properly printed in an automatic photoprinting device, and inputs a correction amount for the automatically calculated exposure amount based on the operator's experience. Therefore, the amount of correction changes depending on the exposure control method of the automatic photoprinting apparatus used. Therefore, in this embodiment, the exposure amount calculation formula of the automatic photo printing apparatus used is written in the calculation section 95.

The calculation unit 95 calculates the exposure amount for each color using the three-color density of each pixel read from the RAM 45. The obtained exposure amount of each color is sent to the subtraction unit 96, and the difference with the exposure amount of each color calculated using the selected arithmetic expression is calculated. This difference in exposure amount is the correction amount, and this is sent to the key stage number converting section 97, where it is converted to the number of correction key stages, and then it is converted to the number of correction keys.

It will be output to a storage medium such as a floppy disk on the 9th. At the time of photo printing, the certified color negative film and the storage medium 98 storing the amount of correction are sent to the automatic photo printing device.

The calculation unit 95 can be used to write calculation formulas by operating a keyboard or the like, but instead, a plurality of calculation units that execute different calculation formulas are provided, and the calculation units can be selected depending on the automatic photo printing device used. It is also possible to select.

In the embodiments described above, the entire skin-colored area is displayed, but instead, a part of it may be displayed in spots, such as a high-intensity or blinking cross mark, circle, square, etc.

Further, by simulating a print photo created by a photo printing device and displaying it on a color CRT, it is possible to prevent the creation of defective print photos.

In this case, a reference table memory is provided between the memory and the A/D converter, and the reference table data is shifted according to the photographic printing exposure calculated focusing on the skin tone area, and this is looked up. It is sufficient to write the data into a table and perform gradation correction of the video signal by referring to this lookup table. Then, by observing the color CRT, if it is determined that the finish is not sufficient even with the automatic skin color control, the color correction key and the density correction key are operated to input the correction amount.

When this correction amount is input, the simulation is performed again and the corrected positive image is displayed on the color CRT.

If you want to simulate and display this printed photo,
If the entire skin-color area is displayed at high brightness, the finish of the skin-color area, that is, the main image, cannot be confirmed, and there is a risk of giving a misunderstanding that the image is extremely overexposed. Therefore, for example, a finish display key is provided, and normally the skin tone area is displayed at high brightness, and when the finish key is operated, the high brightness display of the skin tone area is stopped and a positive image simulating a printed photograph is displayed. It is best to display it on a color CRT.

Furthermore, in the above-mentioned embodiment, scenes are classified using the image feature values obtained from the main image and the background image, and the exposure amount calculation formula is selected according to this scene classification. For example, the density signals of the pixels of the main image may be weighted and then added, and the exposure amount may be calculated according to this added value.Furthermore, it is possible to add weights to the density signals of the pixels of the main image, and calculate the exposure amount according to this added value. The exposure amount may be calculated separately.

〔Effect of the invention〕

As is clear from the above explanation, in the present invention, the skin color of a person, who is often the main image, is defined in advance, the skin color portion is determined by referring to this definition, and the color negative image is displayed on a monitor displaying a color negative image. Since the skin color portion is displayed, the instruction operation for the main image is simplified, and the main image can be verified with high efficiency. Furthermore, since the automatically determined main images are displayed on the monitor, errors in automatic determination can be easily detected.

[Brief explanation of the drawing]

FIG. 1 is a schematic diagram showing an example of a photographic printing apparatus embodying the present invention. FIG. 2 is an explanatory diagram showing an example of an image sensor. FIG. 3 is a functional block diagram of the microcomputer shown in FIG. 1. FIG. 4 is a graph showing an example of the definition of skin color. FIG. 5 is a flowchart showing the procedure of exposure control. FIG. 6 shows a positive image displayed on a color CRT. FIG. 7 is a flowchart showing the procedure for calculating image feature amounts. FIG. 8 is a flowchart showing the procedure for scene classification and exposure calculation formula selection. FIG. 9 is a block diagram of essential parts showing an embodiment in which the main image is displayed blinking. FIG. 10 is an explanatory diagram showing the blinking state of the main image. FIG. 11 is a block diagram showing the main parts of a negative pre-verification device implementing the present invention. 10... White light source 11... Diffusion tube 12... Color negative film 16... Yellow filter 17... Magenta filter 18... Cyan filter 25... Shutter 26... Color photographic paper 32... Mirror 34... Half mirror 35・・Sensor unit 36・・Color TV camera 50・・Color CRT 51a・・Skin color part 53・・Light Ben. Figure 2 Figure 4

Claims (5)

[Claims] (1) means for measuring the three-color density of each point of the color original;
a storage means that stores data defining a skin color range in a positive image; and a determination means that compares the measured value of the measuring means with the data of the storage means to determine whether each measurement point is a skin color. , comprising an image display means for displaying the color original image on a monitor, and a control means for controlling the image display means according to the determination result from the determination means and causing the image display means to display a skin-colored area in a distinguishable manner. A main image display device characterized by: (2) The main image display device according to claim 1, wherein the display means is a color CRT. (3) The main image display device according to claim 1, wherein the display means is a color liquid crystal display device. (4) The main image display device according to any one of claims 1 to 3, wherein the control means displays the entire skin-colored area with high brightness. (5) Claims 1 to 3, characterized in that the control means blinks the entire skin-colored area.
Main image display device according to any one of paragraphs.