JPS62298291A - Color negative image monitoring device - Google Patents

Abstract

PURPOSE:To exactly examine whether finishing is satisfactory or not by fitting a color negative image in a frame and displaying it in a CRT in such state, and selecting the frame of skin color or gray color depending on whether the main picture image is a portrait or a landscape or the different kind of light source. CONSTITUTION:In a case where the main image of a color negative image displayed in a CRT is a portrait, a skin color display key is turned on. Then, a decoder 39 sets a flip-flop 40 at a set state and prepares and address signal from the synchronizing signals of a TV camera 13, and reads out the flesh color frame data stored in video RAM 37a-37c for skin color. Then, frame signals are sent to adders 17-19 through a shift register and a D/A converter and the image is composed. In a case where displayed color negative image is a landscape, when a gray display key 33 is turned on, the decoder 39 resets the flip-flop 40 and video RAM for gray 38a-38c are selected and sent to the CRT similarly. The tone and density of a positive color negative image 45 are compared and examined, and corrected by operating a keyboard 31 as necessary.

Description

Detailed Description of the Invention 3. Detailed Description of the Invention [Field of Industrial Application] The present invention relates to a color negative image monitor device used for pre-inspecting the finish of color print photographs.

[Conventional technology]

Color printers are equipped with an automatic exposure control device that extracts at least one characteristic value from a color negative image and calculates red exposure, green exposure, and blue exposure from an exposure calculation formula using this characteristic value. are controlled respectively. In practice, an exposure control amount having a predetermined relationship with the printing exposure amount is calculated, and the red, green, and blue components of the printing light are automatically controlled according to the exposure control amount. However, since color negative films contain a wide variety of scenes, such as scenes with biased colors or extreme brightness, it is necessary to calculate the appropriate printing exposure amount for all color negative images. It is actually difficult to create printed photographs with a good finish. Therefore,
It is necessary to perform color negative verification using a negative verification device before printing the photograph, and to determine the amount of correction based on the operator's experience for specific scenes where automatic exposure control does not produce a good finish.

2. Description of the Related Art As a conventional negative verification device, one is known that uses a television camera and a CRT to simulate and display a printed photograph. For example, Japanese Patent Application Laid-Open No. 59-101641 discloses that a negative image is captured with a TV camera, the obtained video signal is converted into negative/positive, and the brightness is adjusted according to the exposure amount determined by an automatic exposure control device. However, it has been proposed to send this brightness-adjusted video signal to a CRT and display it in black and white.

[Problem that the invention seeks to solve]

In the above-mentioned negative verification device, a frame of brightness corresponding to standard print density is displayed so as to surround the negative image that has been inverted to positive. This frame is the standard density, so you can refer to it to check whether the printing density is appropriate or not, and furthermore, whether the density correction amount entered manually is appropriate. .

However, this conventional device has the disadvantage that it cannot determine whether the color balance is good.

[Means for solving problems]

In order to solve the above problems, the present invention provides a first memory storing skin color frame data, a second memory storing gray frame data, and means for selecting one of these memories. A means for synthesizing the frame data read from the selected memory and the video signal of the color negative image for each color is provided, and the color negative image is displayed on the color CRT with the color negative image fitted in the frame. .

In the present invention, by comparing the positive color negative image displayed on the color CRT and the color of the frame surrounding it,
It is possible to predict whether a printed photograph with good density and color balance will be produced. If it is predicted that the finish will not be good, the color and density of the color negative image are corrected by inputting a correction amount from the keyboard based on the color of the frame.

When the main image of the color negative image is a person, a skin color is used as the color of the frame, and a correction amount is input so that the person's skin, for example, the face, matches the color of the frame. In the case of landscape photos, there are many green trees in the photo, but gray is easier to distinguish from this green, so gray is used as the frame color. Also, artificial lights such as fluorescent lights and tungsten lights are used. When shooting under a light source, the positive image becomes greenish, so it is best to use gray to distinguish this.The color of this frame can be changed manually, but it is usually displayed in gray. If each pixel measured using a color scanner contains a skin-color pixel in a positive image, the advantage of automatically switching to the skin-color frame is that the switching operation is not necessary in most cases. be.

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

〔Example〕

Illumination light emitted from a white light source 10 is sufficiently diffused by a diffusion tube 11 and then illuminates a color negative film 12 from behind. The color negative image on the color negative film 12 is captured by a color TV camera 13 and converted into a red video signal R2, a green video signal G, and a blue video signal B.

These video signals are subjected to γ correction in a T correction circuit 14, and then converted into a positive image in a positive image conversion circuit 15 and sent to an amplifier circuit 16. The amplification factor of this amplifier circuit 16 is adjusted in accordance with the exposure amount in the LATD method calculated by the CPU 26 at the start of the verification of each frame. Amplification circuit 16
The video signal amplified for each color is added to the frame signal in adders 17 to 19, and then sent to the driver 20. This driver 20 drives a color CRT 21 to produce a composite image in which a positive image is fitted into a flesh-colored or gray frame.
21 display screen.

The system has 25, CPU 26. ROM27°RAM
28. I10 port 29. A CRT controller 30 is connected. I10 boat 29 has keyboard 3
1 is connected to this key fob 31, and a skin color display key 32. Gray display key 33. Correction key for color correction and density correction 34. A numeric keypad 35 and the like are provided. Although this keyboard 31 is not shown,
Keys are provided for inputting various operation commands. Further, an amplifier circuit 16 is connected to the I10 port 29, and adjusts the amplification factor of each color according to the printing exposure amount calculated by the CPU 26.

Video RAM 37a for red, video RAM 37 for green
b. Video RAM 37 for blue color C stores frame data of color components constituting skin color. In this frame data, 8 bits are assigned to one pixel, so that 256 steps of gradation can be expressed for each color. Similarly, the video RAMs 38a to 38c provided for each color store gray frame data.

By operating the skin color display key 32 of the keyboard 31,
Data indicating the type of frame is sent to the decoder 39. Since this decoder 39 sets the flip-flop 40, a chip select signal is output from its Q terminal.

This chip select signal selects the video RAMs 37a to 37c storing skin color frame data. Furthermore, when the gray display key 33 is operated, the decoder 39 resets the flip-flop 40, so that the video RAMs 38a to 38c storing the gray frame data are selected.

The CRT controller 30 is connected to the color TV camera 13.
An address signal is created from a synchronization signal from the skin color video RAM 37a to 37c and a gray video RAM
Send to 38a-38c. These two types of video RA
Of M37a to 37c and 38a to 38c, only the one selected by the flip-flop 40 performs reading. This read frame data is sent to shift registers 41a to 41C provided for each color. Each of the shift registers 412 to 41C has eight output terminals, and frame data on a plurality of scanning lines is written therein. The frame data for each color is outputted in parallel in 8 bits constituting one pixel, sent to D/A converters 422 to 42C provided for each color, and converted into analog signals. The analog signals of each color are sent to the aforementioned adders 17 to 19, respectively, and added to the video signals of each color to perform image synthesis.

FIG. 2 shows a screen displayed on a color CRT. A color image is displayed on the color CRT 21, which is a composite of a flesh-colored or gray frame 46 and a color negative image 4te converted to a positive image. The hatched frame 46 is
This is used as a reference for the color tone and density of the color negative image 45.

In consideration of ease of verification, the width of the frame 46 is preferably about 1/3 of the vertical length of the color negative image 45. The size and color gradation of this frame can be determined using the keyboard 31.

This skin color or gray is the third color in order to make accurate judgments.
It is preferable to use those included in each area surrounded by hunting in the color space of the figure. Note that a part of the periphery of the color negative image 45 is erased, and a frame 46 is inserted so as to fit into this area.
may be displayed. In addition, the gray frame has a density of 0.
It is best to adjust the brightness so that it becomes 7.

Next, the operation of the above embodiment will be explained. First, C.P.
The U26 reads frame data of standard size and standard color from the ROM 27, and stores it in each video RAM 37a to 3.
7c and 38a to 38c, respectively. On the other hand, the color TV camera 13 captures a color negative image 12 illuminated with white light and generates video signals of each color. This video signal is processed by γ correction, negative/positive conversion, and brightness adjustment according to the printing exposure amount, and then processed by adding circuits 17 to 19.
is sent to the driver 20 via. This driver 20 drives the color CRT 21 to display a positive color negative image on the CRT 21.

The displayed color negative image is observed, and if it is recognized that the main image is of a person, the skin color display key 32 is turned on. When this skin color display key 32 is operated, the decoder 39 puts the flip-flop 40 in the cent state, so that the skin color video RAMs 37a to 37c go into the read mode.

The CRT controller 30 creates an address signal from the synchronization signal of the color TV camera 13, reads out the skin color frame data stored in the skin color video RAMs 37a to 37c using this address signal, and transfers the data to the shift registers 412 to 41.
Send to c. The shift registers 41a-41C read out 8-bit signals in parallel and send them to D/A converters 422-42C. This analog-converted frame signal is sent to adders 17 to 19 for image synthesis.

As shown in FIG. 2, the color CRT 21 displays a positive image in which a color negative image 45 is inserted into a skin-colored frame 46. This positive image is observed to compare and examine whether the skin of the person in the color negative image 45 matches the color of the frame 46. If the two do not match, the correction key 34 of the keyboard 31 is operated to empirically determine the amount of correction for the basic exposure amount calculated by the exposure control calculation formula, and this correction data is input. When this correction data is input, the CPU 26 controls the amplifier circuit 1 according to the correction data.
An amplification factor of 6 is calculated for each color and sent to the amplifier circuit 16. Since this amplifier circuit 16 amplifies the video signal of each color with a new amplification factor, the color and brightness of the color negative image displayed on the color CRT 21 change. In this way, the skin color of the color negative image 45 is made to match the color of the frame 46. The correction data when they match is output from the I10 port 29 when the verification end key is operated, for example, and written to a storage medium such as a paper tape or a magnetic floppy disk. This storage medium is loaded into a photoprinting device when a printed photograph is created.

When the color negative image displayed on the color CRT 21 is a landscape, the gray display key 33 is turned on. Decoder 3
9 puts the flip-flop 40 in the reset state, so
The gray video RAMs 38a to 38c are selected, and the gray frame data stored therein is read out in synchronization with the color TV camera 13, combined with the color negative image, and sent to the color CRT 21. Using the gray frame 46 displayed on the color CRT 21 as a reference, the color tone and density of the positive color negative image 45 are compared and examined, and if correction is necessary, the correction is performed by operating the keyboard 31.

〔Effect of the invention〕

As explained in detail above, the present invention selects a flesh-colored frame and a gray frame, and displays the color negative image in one of the frames on a color CRT, so that the main image is By using a skin tone frame for a person, it is possible to accurately test whether the finish is good, and by using a gray frame for landscapes or different light sources, the same can be verified. be able to.

[Brief explanation of drawings]

FIG. 1 is a block diagram showing an example of the apparatus of the present invention. FIG. 2 is an explanatory diagram showing an image displayed on a CRT. Figure 3 shows CIE1976 skin color and gray ranges.
It is a u', v' chromaticity diagram. 12...Color negative film 21...Color CRT 31...Keyboard.

Claims (1)

[Claims] (1) In a color negative image monitor device that captures a color negative image, inverts the negative/positive image, and then displays it on a color CRT, a first memory stores skin color frame data, and a second memory stores gray frame data. , means for selecting one of the first memory and the second memory, and means for combining the frame data read from the selected memory and the video signal of the color negative image for each color, A color negative image monitor device characterized in that a color negative image is displayed on a color CRT in an embedded state.