JPS6043718B2 - Plate-making equipment for printing television images - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a plate-making apparatus, particularly a color television image plate-making apparatus for producing printing plates for color television images.

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 mass-producing television images by printing, the television images are photographed using, for example, a steel camera, the finished color photographs are run through a plate-making machine, and a printing plate is created. A large number of copies of John's images are made. However, the color temperature of television images projected on color cathode ray tubes is usually around 90,000, and since they emit light from three types of phosphors: red (R), edge (G), and blue (B), they cannot be seen by the naked eye. Even if it looks good, it does not match the sensitivity distribution of the photographic emulsion, so it is not possible to obtain a satisfactory color photograph simply by converting the color temperature by taking a color photograph of the television image projected on the cathode ray tube surface. Furthermore, a television image is made up of 525 scanning lines, regardless of the screen size.
It has the lowest resolution among commonly used images. Furthermore, since the color photograph must be made into a color photograph and then plate-made again, the actual printed television image will be considerably inferior in resolution, hue, gradation, etc. SUMMARY OF THE INVENTION Accordingly, an object of the present invention is to provide a plate-making apparatus for printing television images that does not deteriorate the resolution, hue, gradation, etc. of television images.

The present invention reads a video signal corresponding to one desired frame from a video tape recorder that records a television image signal, converts this signal into three primary color signals, and supplies the three primary color signals to an electronic plate making device such as a color scanner. This invention relates to a television image plate-making apparatus for producing color separation plates, etc., which selectively extracts a necessary one-frame image and directly finishes the image into a printing plate.

Therefore, the present invention skips the intermediate steps and directly produces a printing plate from a television image without degrading its original resolution, hue, or gradation.
The signal reading is controlled and synchronized in accordance with the rotation of the prepress scanner, and existing scanners can be used. FIG. 1 is a basic configuration diagram of the present invention.

In order to determine which image to use for printing, a television image recording and reproducing apparatus 1 is required as a first means for recording and reproducing television images and selecting from among the images. Then, one frame of the selected image is transferred to the frame memory 2 for storage and reproduction.
One frame of television image is composed of two fields of images, and 525 television signals are divided into two and interleaved, so the playback signal from frame memory 2 is directly supplied to plate-making scanner 6. Can not.

Therefore, it is necessary to rearrange the order of the signals interleaved into two fields into one frame signal. The circuit for this purpose is the signal order conversion circuit 3. Next, in order to make a signal for printing, the NTSC television signal is color separated by the signal color separation circuit 4 into R, G, and B signals, and then Y (yellow), M (magenta), and C (cyan). )
and input it to the plate-making scanner 6.

In the present invention, YMC signals are supplied to the existing plate-making scanner 6, and YMC signals for printing are supplied. M. C. It is characterized by finishing a BK plate, and a rotation synchronization circuit 5 is provided to control and synchronize signal readout in accordance with the rotation of the exposure device (plate making scanner 6).

Next, FIG. 2 shows a block diagram of an embodiment of the present invention.

In this figure, a video tape recorder (VTR) 11 is supplied with an NTSC television signal.

As the video tape recorder 11, a 1-inch or 2-inch professional video tape recorder is used.
In addition, this video tape recorder should preferably be capable of slow playback and still playback in order to select frames as a manuscript for plate making.

A frame number generator 12 and a read frame number indicator 13 are coupled to the video tape recorder 11 . A monitor television 14 and a frame memory 15 are connected to the playback output of the video tape recorder 11. The frame memory 15 includes a storage/reproduction instruction circuit 1
The frame signal is configured to be stored and reproduced in response to a recording or reading control signal from 6. The storage/reproduction instruction circuit 16 is a television synchronization signal generator 17
A storage control signal is generated in synchronization with a synchronization signal from. A reproduction (read) output of the frame memory 15 is connected to a switch circuit 19. The television synchronization signal generator 17 is necessary for correct reproduction of the VTR, but also for correctly transferring one selected frame to the frame memory 15.
It serves as a reference signal for sending and storing data.

Although the frame memory for storing one frame of image may be an analog magnetic disk memory or a digital solid state memory, the magnetic disk memory will be explained here.

Video signals are stored in this magnetic disk memory in the form shown in FIG. One frame of television image is formed by 525 scanning lines and consists of odd and even fields.

For one frame image, 1-20 and 263-2
It has 83 vertical blanking periods, and has a vertical synchronization signal therein, and also has a horizontal blanking period between each signal line, and has a horizontal synchronization signal therein. .

Incidentally, the odd field is composed of scanning lines 21 to 263 as shown in FIGS. 3 to 4, and the even field is composed of scanning lines 283 to 525. When reading a video signal from the frame memory 1 river 5 shown in FIG. 3, if the order of the scanning lines in FIG.
3. The scanning line 21 of the odd field, the scanning line 284 of the even field, etc. The even field and the odd field are sequentially read out alternately. During this reading, the magnetic disk memory rotates at a constant speed, and a magnetic head (not shown) outputs video signals corresponding to the scanning lines in the order in which they are read. Reading of signals in accordance with the above order is performed by controlling the opening and closing of the switch circuit 19 in accordance with a control signal from the gate signal generating circuit 20. The output of this switch circuit 19 is stored in an even number memory 21 and an odd number memory 22. It is preferable that the playback speed of the frame memory 15 is set to 111 (real time), which is the same as that during recording.

The frame memory 15 is set in a reproduction mode during plate-making exposure, and the next switch circuit 19 arranges the order of the signals. Switch circuit 19, even number memory 21, odd number memory 2
FIG. 5 shows the relationship between writing and reading in No. 2.

A pulse synchronized with the rotation of the exposure cylinder from the special edition scanner 27 is locked by a synchronization circuit 28 to create a readout signal H.

This read signal H and the reproduced signal from the frame memory 15 are supplied to a gate signal generation circuit 20 that generates a signal to open the switch circuit 19. The gate signal generation circuit 20 separates the synchronization signal from the video signal, gives the video signal a number as shown in FIG. switch circuit 1
Generates a signal to open and close 9. The signal passing through the switch circuit 19 is transferred to the even memory 21 or the odd memory 22 depending on the even field or odd field.
A signal is read out by the read signal 1 or J from the read signal generation circuit 23.

The television signals output from the even memory 21 and the odd memory 22 are converted into R. G
．． It is separated into three colors of B and Y (yellow) by the color calculator 26.
, M (magenta), and C (cyan) signals to the plate making scanner 27.

In the existing prepress scanner 27, Y. M. A BK (black) signal is created from the C signal and is supplied to the exposure section through an image quality correction circuit. A feature of the apparatus of the present invention is that it uses an existing prepress scanner.

In existing scanners, the exposed film is circular. Wrapped in a tube, 140 pieces/CTri
Alternatively, it is rotated at a speed of 200 lines/CrfL and exposed. In a normal plate-making scanner, the original side and the exposure side rotate in synchronization, and the original size and the exposure side are rotated in synchronization.
Expansion and contraction are also possible.

In the apparatus of the present invention, by synchronizing the rotation speed of the 525 television images and the plate-making scanner, it is possible to enlarge the image from the original size.

Since existing prepress scanners do not have a variable rotation speed, the rotation of the scanner cannot be controlled in accordance with the television signal, so the reading speed of the television signal is controlled by the rotation of the scanner and the prepress magnification. In the present invention, the scanning direction of 52 television signals is made to coincide with the Y direction in FIG.

A television image is made up of 525 scanning lines.
Plate making scanner: 140 pieces/C7rl or 200 pieces/C
Since there is only a feeding mechanism determined by Tn, etc., plate making dimensions cannot be determined arbitrarily. When an image is created with an exposure of 525* using a plate-making scanner, and the magnification is expressed as the original size, the specific dimensions in this case, excluding the vertical and horizontal blanking periods, are X = 3.5c at 140 lines/cm. ! N,. Y=4.1 cTn.

200 books/C! In RL, X=2.7G1Y=3.
3c! It becomes n.

Expansion can be obtained as follows.

For example, an n-times image means 525 images in a prepress scanner.
This is a case where an image is created using ×n lines. That is, one television signal is exposed n times in a plate making scanner. Therefore, the magnification ratio can take any value that is an integral multiple, and the plate-making dimension X is determined together with the magnification determination.

On the other hand, the dimension of Y is determined by setting the magnification by the magnification setting circuit 25 shown in FIG. 2, and then the number of read pulses (coinciding with n) and width (y in FIG. 5) are determined. As an example, when n=2, the signals stored in the even number memory 21 or the odd number memory 22 only need to be read out twice each, and in the case of 140 lines/cm, the plate making size is 7.0 crf1 x 8.2 c! n The gate time of the switch circuit is 52.7 μs excluding the horizontal blanking time.The rotation speed of the plate making scanner is 10 revolutions/
Second cylinder circumference L = 6.5″″ = 165 sequential exposure time approximately 10＠.

The present invention has the above-mentioned configuration, and the television image is sent as an electric signal to the plate-making scanner and exposed directly onto the film. Conventionally, the television image on the cathode ray tube is taken as a color photograph with a camera, and the color photograph is taken. There is no deterioration in resolution, gradation, or hue compared to those that make plates from photographs.

In addition, as the plate making scanner rotates, signal reading is controlled and synchronized, so existing scanners can be used as is, making this an extremely effective invention.

[Brief explanation of the drawing]

FIG. 1 is a block diagram of the basic configuration of the present invention, FIG. 2 is a block circuit diagram of a television image plate making apparatus according to an embodiment of the present invention, and FIG. 3 is a magnetic block diagram used in the plate making apparatus of FIG. A storage data pattern diagram of a disk memory, FIG. 4 is a diagram showing the scanning lines of a television screen, and FIG. 5 is a diagram explaining the relationship between writing and reading in even and odd memories used in the plate making apparatus of FIG. 2. , FIG. 6 is a perspective view of the cylinder of the scanner. 1...Television image recording and playback device, 2...
... Frame memory, 3 ... Signal order conversion circuit, 4 ... Signal color separation circuit, 5 ... Rotation synchronization circuit, 6 ... Plate-making scanner , 11...
... Zedeo tape recorder, 12 ... Frame number generator, 13 ... Read frame number indicator, 15 ... Frame memory, 16 ...
...Storage/reproduction instruction circuit, 17...Television synchronization signal generator, 19...Switch circuit, 2
0...Gate signal generation circuit, 21...
Even number memory, 22...Odd number memory, 23.
...Read signal generation circuit, 24...NTSC
Decoder, 25...Magnification setting circuit, 27...
... Plate making scanner, 28 ... Synchronous circuit.

Claims (1)

[Claims] 1. A frame video signal storage device that stores one frame of color television video signal, and a memory that stores a scanning line signal consisting of two fields sequentially read out from the frame video signal storage device, dividing it into an even field and an odd field. , a means for reading out even and odd fields alternately for each scanning line in synchronization with the scanning speed of the prepress scanner, and an NTSC television signal. G. B.
a device for converting into a signal of R. G. From the B signal, Y. M
．． C. A plate-making device for printing television images, which includes a plate-making device such as a scanner that makes separated BK plates.