JPH0151830B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a color television image plate-making device that makes printing plates for color television images, and it directly produces yellow and red for printing from a signal obtained by combining a television signal and a color film decomposition signal. It is characterized by creating four versions: , indigo, and ink.

As the content of television programs has expanded, there has been a need to record desired images from television images as photographs or prints, and to reproduce them in large quantities. Conventionally, when making large-scale reproductions of television images by printing, the television images are photographed using, for example, a steel camera, turned into a color photograph, this color photograph is run through a plate-making machine to create a printing plate, and this printing plate is used to reproduce the television image. Massive copies of Ji-young's images are made. However, the color temperature of television images projected on color cathode ray tubes is usually around 9000〓, and red (R),
Since it emits three types of phosphors, green (G) and blue (B), although it looks good to the naked eye, it does not match the sensitivity distribution of the photographic emulsion. When taking color photographs of images, it is not possible to obtain satisfactory color photographs simply by converting the color temperature. Additionally, television images are composed of 525 scanning lines, regardless of screen size, and have the lowest resolution among commonly used images. Moreover, since the color photograph must be made into a color photograph and then plate-made again, the actual printed television image is considerably inferior in resolution, hue, gradation, etc.

In order to eliminate the above-mentioned drawbacks, a device has been devised that sends the television image as an electrical signal to a plate-making scanner and exposes it directly onto the plate-making film. There is no deterioration in resolution, gradation, or hue that occurs when an image is taken as a color photograph using a camera and the color photograph is made into a plate.

Figure 1 is a basic block diagram illustrating the configuration of a device that sends a television image as an electrical signal to a plate-making scanner and directly exposes it to a plate-making film. Although it is possible to synchronize the rotation, there is also a method of reading out the television signal in accordance with the rotation of the prepress scanner.

First, we need a TV signal source. In Japan
It is possible to obtain an NTSC system TV composite signal, and this device is made for the NTSC system. PAL method,
The same applies to other methods.

This TV signal source can be obtained from the VTR 1 as shown in Figure 1, but it can also be obtained by demodulating from broadcast radio waves, or directly from a TV camera.

Next, you will need an interface to convert this TV signal into a signal suitable for the scanner. The interfaces are mainly frame memory 2, NTSC decoder 3, synchronization circuit 4, and color monitor TV 5.
It consists of etc.

Since the TV signal from VTR 1 is a moving image at 30 frames per second, images suitable for printing are selected from among them and stored in frame memory 2. The memory instruction may be performed manually or automatically by the frame designation circuit 6.

The frame memory 2 stores one frame, that is, two field images. One frame signal consists of 525 lines, but since it consists of 2 fields, the signal is NO on the line.
For example, an odd number field is 1,
The even field consists of 2, 3, ...263 (1/2) signals, and the even field consists of 263 (1/2), 264, ...525 signals, but in order to make this signal suitable for the scanner, 263 (1/2), 1, 264, 2, 265, 3,...
They must be rearranged in the order of 525, 263 (1/2). Also, the playback speed of VTR1 is 1/30 per frame.
For example, since the scanner rotates at 10 revolutions per second, in order to scan 525 lines, 525/10 =
It takes 52.5 seconds. Therefore, it is necessary to convert the time from 1/30 second to 52.5 seconds, that is, to slow it down. Furthermore, the NTSCTV signal must be separated into R, G, and B3 primary color signals.

Frame memory 2 has a rotating magnetic disk,
There are CCD analog memories and digital memories using RAM, but recently digital memories are easily available and are the best because they are stable and do not cause signal degradation. When reading out the memorized signal, the signal is slowed down, but this can be done in accordance with the rotation of the scanner, or it can be slowed down to 1/n in a synchronous circuit and the rotation of the scanner can be controlled in accordance with that signal. good.

When slowing down the signal and reading the signal from the frame memory 2, the above-mentioned line order may be taken out alternately from both the odd and even fields. This is when using the entire image of one frame, but if you only need the image of one field, you can read out the signal of one line two lines at a time, or interpolate between each line. , it is possible to create a frame image from one field.

The order of the frame memory 2 and the NTSC decoder 3 may be reversed, and the NTSC decoder 3 may first decompose the R, G, and B three primary color signals, and then these signals may be stored in each frame memory 2. In other words, it can be seen that if the NTSC decoder 3 is placed next to the VTR 1, three frame memories need only be provided after it.

The R, G, and B three primary color signals thus obtained are input to a scanner, and after being subjected to desired correction by a color computer 7, are exposed onto a film 9 by an exposure head 8.

A film 9 to be exposed is wound around an exposure rotating cylinder 10 and rotated by a drive unit 11 using a motor or the like. The exposure head 8 is fed by a head feed screw to perform surface scanning, and light modulated by a signal is emitted from the exposure head 8 to the film 9, and the film 9 is exposed to form a film image.

The four decomposed yellow, red, indigo, and ink plates can be exposed in a variety of ways, including one method in which the four plates are exposed individually in order using a scanner, as shown in Figure 1, and one in which the four plates are exposed in a square pattern. There is something. It is not limited to one method.

Next, a specific example of exposure will be described.

The exposure cylinder rotates at a rate of 10 revolutions per second, and its rotation is performed by a rotation control circuit 12, which controls the synchronization circuit 4 of the interface with pulses issued from the rotation control circuit 12, and controls the frame memory 2.
The reading from is controlled.

Increase the feed rate of the scanner's exposure head to 500 lines/
inch, and if the TV's 525 scanning lines and the scanner's feed rate are 1:1, the dimensions of the four-color separation plate are
The dimensions are 26.7 x 35.6mm. If this dimension is assumed to be the original size, in order to obtain a dimension 10 times larger, the scanner feed should be 10 lines per scanning line, or 1:10.
And it is sufficient. In this way, finished dimensions with arbitrary magnification can be obtained.

In the apparatus previously used by the applicant as described above, the scanner did not use a document cylinder.

The present invention is characterized in that image composition can be performed using a document cylinder. A normal scanner consists of an original cylinder and an exposure cylinder. Color film or photographic paper is wrapped around the original cylinder, the image signal is obtained from a photoelectric conversion head, and the R, G, and B signals are processed by a color computer. A four-color separation plate is obtained by printing onto film using an exposure head.

The document cylinder and the exposure cylinder are either coaxially driven by a single motor, or driven by separate motors whose rotation is controlled by a rotation control circuit.

The present invention is capable of combining a color film image and a TV image, and obtaining the combined image as a four-part image.

FIG. 2 shows a block diagram of the present invention.

The TV signal passes through the interface R, G,
The resulting image is decomposed into B and is input to input A of the image synthesis console 13.

Signals from the color film 15 or photographic paper wound around the document cylinder 14 of the scanner are decomposed into R, G, and B electrical signals by the photoelectric conversion head 16, and then passed through the amplifier circuit 17 to the image synthesis console 13.
is input to input B of

The output signal combined with the desired image is R,
The G and B images are input to the scanner as they are, and then passed through the color computer 7 to the exposure head 8, where a four-color separated version of the composite image is obtained.

The image synthesis console 13 has exactly the same technical background as editing switchers and special effects generators used in TV studios, etc., and its main functions include wipe and chroma key, and it does not intentionally distort images as special effects. It is easy to set the

For example, when compositing images using chroma key, color film 1 with a blue background is used.
5 is wound around the document cylinder 14, and a signal separated into R, G, and B is obtained from the photoelectric conversion head 16.
Signals to be inserted into the blue back part of the film image are obtained from the VTR 1 and input to the image composition console 13, which outputs a composite image in which the VTR image is inserted into the blue back part of the film image. You can get it.

A TV image is made up of 525 scanning lines. When separating the color film 15, the number of scanning lines when separating the color film is determined by the feed density of the photoelectric conversion head 16 and the film size.
For example, in the case of a 6 x 7 film, if the screen is 56 mm x 67 mm and the head feed density is 500 lines/inch, the number of scanning lines for 56 mm is 56 x 500 ÷ 25.4 ≒
There will be 1100 pieces. When combining, the conditions for reading signals from the frame memory 2 are determined based on the relationship between the ratio of the number of scanning lines and the size of the image to be combined.

When composing images, the relationship between the two signals may be reversed, but the above combination is preferable in terms of the amount of information contained in the image.

Since the present invention is as described above, the original (color film,
It is possible to combine photographic paper (photographic paper) and TV images and to generate special effects, which has great practical effects.

[Brief explanation of drawings]

FIG. 1 is a basic block diagram of a television image plate making apparatus, and FIG. 2 is a block diagram of the television image plate making apparatus of the present invention. 1...VTR, 2...Frame memory, 3...
NTSC decoder, 4...Synchronization circuit, 7...Color computer, 8...Exposure head, 9...Exposure film, 10...Rotary cylinder for exposure, 11...Drive unit, 12...Rotation control circuit, 13...Image composition console, 1
4... Cylinder for manuscript, 15... Color film,
16...Photoelectric conversion head, 17...Amplification circuit.

Claims (1)

[Claims] 1. In a television image plate making device that creates color separation plates by directly supplying television video signals to an electronic plate making device, image signals photoelectrically converted from a document such as a color film wound on a scanner document cylinder are used. and a television video signal read out according to the rotation of the cylinder from a memory device that stores the television image signal, and directly supplies the signal to the electronic plate making device as a color scanner signal, thereby producing color separation plates. A television image plate-making device characterized in that it creates a television image.