JPS59226347A - Method for extracting and photoengraving specific picture - Google Patents

Abstract

PURPOSE:To extract and photoengrave a specific picture easily, accurately, and quickly by utilizing the fact that density data becomes discontinuous to generate a density jump phenomenon with respect to the outline of the picture. CONSTITUTION:When plural coordinates of the outline of a picture to be extracted on an original 1 on an original placing table 32 are read by a coordinate reader 31, corresponding addresses are stored in a register of a computer 11. A storage device 41 where density data of the picture is scanned in every scanning line on a basis of these addresses to detect a jump of the picture density on the outline of the desired picture, and the address of the outline of the desired picture in every scanning line is stored in the computer 11. Each color density data of the original 1 corresponding to this address at an exposure time is outputted from the computer 11 to an output circuit 51, and thus, a specific picture is extracted and is subjected to photoengraving easily, accurately, and quickly.

Description

[Detailed Description of the Invention] This invention extracts a specific image from a manuscript and makes plate-making-4-
ro)) related to leaving.

When creating a printing plate, in order to carry out the so-called cutting operation (opaque work), which involves leaving only one specific image and deleting the other parts, it is necessary to cut out the image to be kept [the image part is transparent to light]. However, other parts (preparing a mask plate that does not allow light to pass through), and overlaying this mask plate and a plate-made printing plate (film plate) on an unprocessed film plate and printing the specified parts. It has been practiced to produce a printing plate on which only one image exists.

However, such conventional technology requires a large number of steps, and most of the steps require manual labor, making the work complicated and inefficient.
Furthermore, since the operating work requires some experience, it is necessary to train skilled workers to carry out this work.

On the other hand, for large scale computing, editing,
A so-called Layerer I scanner system with a correction function has recently been developed and put into practical use.By using such a layout scanner system, it is possible to extract only the elements of a specific image and output it. However, it is possible to remove other images and make a plate by using a large-scale computer, which has the disadvantage that the entire system is large-scale and expensive.

This invention has been made in view of the prior art, and its purpose is to provide a method for extracting and making a plate of only a specific image, which can reduce manual work as much as possible. Another purpose is to provide a method for extracting and making a plate of only a specific image that can reduce work time, and a further purpose is to provide a method for extracting only one specific image of a specific song that does not require human intervention. Another object of the present invention is to provide a method for making a plate by extracting only one specific piece of music that can accurately extract one piece of a specific piece of music. It is in.

The present invention, which was made to achieve such an object, utilizes a scanner/stem and a 1414 mark reading device, and uses a scanner/stem and a 1414 mark reading device to detect a phenomenon in which density data becomes discontinuous at the contour line of an image and a density jump phenomenon is observed. This is something that should be done with attention.

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

Figure 1 shows a model of a manuscript with images to be extracted, and Figure 2 is an enlarged view of the image to be extracted in Figure 1. FIG. 3 is a system configuration diagram for carrying out the plate making method according to the present invention, and FIG. 4 is a flowchart showing the processing procedure by the computer shown in FIG. 5.

In Figure 1, (1) is a manuscript, and this manuscript fl+
may be a transparent original such as photographic film, or a reflective original such as a painting, photographic paper, or general printed matter. (2) exists.

Such a document t1+ is applied to the input section of a color scanner (electronic color separation machine) commonly used in the printing field. The general configuration of the input section of a color scanner is as shown in Fig. 2, a rotating drum (not shown) on which original documents are attached.
and a light source (121,
The reflected light or transmitted light from the original (1) is reflected by a half mirror,
It is divided into 5 parts using a diphroic mirror, etc., and then passed through a color separation filter to receive the light separated into 3 colors: 1 (1), G, and B, and photoelectric conversion using a diode, photomultiplier, etc. The light receiving section f131. f141
J1. By moving the irradiation position relative to the rotating drum in the axial direction of the rotating drum, the entire surface of the document (1) can be scanned and shifted.

Light receiving section (13), f141. (From 151, each R-
An electrical signal of a magnitude corresponding to the amount of received light kc of the six colors of a and 13 is output, and the intensifier Ifl
it, (1″r+, increased II at t181) and sampled at an appropriate number of sambling cycles at the sampler 11!+1, (zO), (21;, and then converted to A/1] converter (22) , (2, subtraction, C74), it is converted into a digital signal and sent to the computer (11).This means that the density of R1() and B for each pixel of the document has been detected.In this case, The density not only refers to the actual density by taking the logarithm of the ratio between the amount of incident light and the intensity of the transmitted light or the intensity of the reflected light, but also refers to the actual density of the reference light received at the light receiving section. Quantity ratio !JD ＜
It is considered to include a wide range of concepts.

Ichiriki, t31) is a 14-mark reading device, which loads the original (1) on the original mounting table C, 321,
31 to the point where the coordinates of the original +11 should be read, position the cursor at that point, and press the input capo
(not shown), the X coordinate detection unit f341 and Y
The coordinate detection unit (J51 can read the X and Y coordinates of a point. The coordinate reading device is a magnetic plate placed under the surface of the document table (321) in the X and Y directions. A type in which a sensitive line is arranged and the X and Y coordinates are read by sensing the magnetic line from the cursor (33), or a type in which the cursor (, +:s) is supported by the x rail and the Y rail, and the cursor C13+ and the Or is it common to detect the amount of movement of the Y rail with a rotary encoder or the like and read the coordinate values? A device can also be used.

The I+16 target value from the X coordinate detector (34) and Y coordinate detector 1:451 is digitized by the A/D converter (3G)-(37) and input to the computer a1+.

Such a coordinate reading device t:(+) allows you to extract the original document mounted on the original placing table (:3).
Along the outline of the 1+j1 elephant (2), as shown in FIG. 2, read the four marks (I) at a plurality of points (33). This point is not limited to the contour line, but is preferably a point that is close to the contour line and exhibits the characteristics of the line.

A rotation detector (25) detects the rotation of the rotating tram, and operates to generate one pulse per rotation of the rotating drum. The scanning line number generator (26) uses the scanning start signal as a trigger and sends the scanning line number m, which is added by VC1 every time it receives a pulse from the rotation detector (25), to the computer (mark), and is used for one scanning. The sampled density data for each pixel and its scanning line number are sequentially stored in the storage device (4I).

On the other hand, a plurality of points 3. from the coordinate reading device (31). -52
. . . The coordinates of 31 should also be stored in other areas of the storage device.

Here, it is easy to associate the coordinate data described in -h with the scanning line number and density data from the scanner. For example, by setting the relationship between the coordinate system and the address where the density data is stored in advance. For example, by specifying the coordinates, the address where the σ1'3 degree data of that point is stored can be found, and therefore the density data of that point and the included scanning line number can be retrieved.

The output circuit (51) corresponds to the cutting edge part of the scanner, and outputs the manufacturing quality signal in each color of the image cut out by image processing (2) from the computer image (image cut out by image processing). The color signals of P5, G, B, Y, IJ,
Convert to C color signal, adjust density range and conotrast to correct tone), and perform further color correction (masking)
, After masking is completed, 'i, M, C signals are BK.
(black) signal is generated by a printing press, undercolor is removed, and based on the four color signals obtained in this way, exposure lamps t:i21,! ．． 'i31, (5・1), (5
5), the photosensitive film mounted on a rotating drum (not shown) is exposed to exposure lamps (52, (53), (5・I), and (55)). By doing this, only one image (2) is made into a plate, and the film plate with the other areas removed can be created.

Next, the process of cutting out one image in the computer (11) will be explained.

The storage device (41) contains raster data from the scanner and I from the coordinate reading device (31). +'; Standard data is stored.

As shown in Fig. 4, the +:+i marks of points 31, 32, 3/ read as the contour line KG are taken from the computer (for storage) to a buffer in the computer (111) and read sequentially. ((Step (fil)).Scanning line number I corresponding to this j coordinate) and density data address (i
．． , j) from the above relationship (step lli2)
), the obtained scanning line number n and address information (l-J)
is stored in the -I register (step lfi41).
). Since the address information obtained here should serve as a reference for finding the line '1~ to the ring v1, it is particularly referred to as a reference address. Write this kind of processing in the buffer 1
, the coordinates of all the points shown are
The scanning line numbers corresponding to the four targets and the reference addresses where the density data are stored are generated.

At this point, A31 was read by the coordinate reading device.

This means that we have been able to find the scan line numbers and standard addresses for 32..., 31, but the standard addresses for other scan lines have not yet been determined, and we will use this next time. Find the following steps.

That is, Stenob i65) First, coordinate reading points 1 and 3.
Read each scanning line number and reference address of 2, and calculate the reference addresses of all the scanning lines existing between these scanning lines by calculating the reference addresses of points 31 and 32, for example, by linear approximation (step tllil). Record the original source address along with the scanning line number] and record it in the target device 4 (old).
lee (step +67)). Perform this operation sequentially for dots 2 and 33, dots 3 and 54, . . . , dots 31-1 and the nail, and dots 31 and 61 to scan the image (2) to be cut out. All the scan lines are 6
Find the S'f-address. Therefore, the reference address stores the density data of the point located near the outline of the cropped image (image) of the scanning line 7U.

After such processing is completed, the process of sequentially cutting out (extracting the contour line of one image) is performed from the running green B of the first city, which will be described later.

Step (70) Step one by one from the first scanning line 1-1, it is checked whether or not there is a reference address in that scanning line.If the reference address is not present in the scanning line, step (70) is performed. 70) and the next scan line error code is set.

Also, the scanning line VC)41. 1. If an IA address exists, record the data of each pixel in that scanning line once. Sales from θ-equipment R (old) to combination, -ta (11) (step +71)).

Next, this /JE fr tjl K,=s is calculated based on the bla degree data of the reference address (1=) and the base c1? - Compare the density take of the address next to the address with step +7:<) ), and further step f75) It Compared to this, I'm so talented.
, if the difference exceeds the set value, there has been a jump in concentration.
It can be determined that there is a lot of shouting of ij I&, and one of the two a) responses in which the degree of ``ji'' ng was seen is selected as the address of the outline and gland, Store it in a register along with the scan line number.

In other words, if there is no jump, when comparing the density of the reference address (i, j) K with the addresses before and after it, m - = 0, so the step (78
) to step 180) are steps (73) to step (
75), 1 is added and added over mi, and in steps (73) and (74), θ of the reference address (1,, ]) is calculated based on this address and the degree of manufacture of that address is calculated. The address after rEjJ is compared with once, and if there is no concentration difference as a result of the comparison, the step (r8
), 17! At il, base a ■ Seven tres before the address (i, j) as base thread (c) Compare the density of that address and the addresses before and after it, and as a result of the comparison, the difference in density is equal to the set value. If it exceeds it, it means that there was a density jump point (and then one of the addresses where 7 jumps were seen is set as an export winning address along with the scanning line number. ).As a result of the comparison, if the density difference is less than the set value, it is assumed that there is no a-degree change, and the reference address (1, J) is shifted forward or backward by 1 (with !), and the same procedure as above is performed. Continuing the concentration comparison (.

These operations are performed sequentially on each scanning line (thereby, there is a ring of image (2) to be extracted in the register!
11≦ indicates A-address ('i\ information should be accumulated.

Therefore, the ring required when outputting the density take for each scanning line at the time of output (during exposure)! , Ii win address 4 (in the case of this embodiment, between the two contour addresses that exist in one scanning line'1- tl If the other density takes are not output, only the data of the image (2) is sent once to the output circuit (triI), and the output circuit (50) The exposure lamp (!121- (Ii31,
(5.1), (55) It is possible to extract only one image of a specific image and make it into a plate-making film.

In addition, the ja degree data for ratio 1 bite may be used for any of the colors Y(, (), and B). 41Ii without being limited to 1.
There are 111 possible modifications that may be included as embodiments of the present invention.

Further, although this invention relates to a plate-making method, a technique r for finding the outline of an image of a document can also be applied. In this case, it is not necessary to use the prepress scanner shown in the example (although a simpler scanner can obtain scan line numbers and monochromatic density takes as rasquetakes).
It is possible to use Sundem.

As described in detail above, according to the present invention, when an image from a part of a manuscript is extracted and made into a plate, a plurality of points that fall on the outline of the image from the 4-sheet reader are detected. r4x
From the target and the density take for each scanning line from the scanner,
Since the contour line is extracted based on the phenomenon that the contour line of the elephant (seismic intensity take; you can see discontinuity and a jump in density), the contour line is extracted for each scanning line based on the obtained contour line. By selectively outputting the degree data, it is possible to produce a specific image [only the image is to be plated].Compared to conventional methods, existing equipment can be utilized to the maximum, making it simpler, more effective, and more accurate. It is something that can be used for work.

[Brief explanation of the drawing]

Figure 1 shows an example of the present invention; is an enlarged explanatory diagram of the self-cleaning part to be extracted in Fig. 1, and Fig. 6
A system configuration diagram for carrying out the present invention's K-carro plate making method (1) (Yes, Figure 4 is a flowchart 1 showing the computer e-carro processing procedure in Fig. 6. (1)... Manuscript (2)...Image 1 to be extracted 31.32..., Roe...Point near ring 4'14 (11
)...Computer (31+...Coordinate reading device (4I)...Storage device 160il)...Output circuit Patent applicant Toppan Printing Co., Ltd. Representative Kazuo Meiki

Claims (1)

[Claims] 1) Obtain θ degree data of the image of the original by scanning the original and store it in a storage device, and extract the original from the original and determine the positions of multiple points accumulated on the outline of the image to be made into a plate. When the coordinates are read, the address of the Ail storage device corresponding to the read coordinates is found, and the density jump point of the density data is determined for each scanning line based on this address, and the image 1 to be extracted is determined. The contour line of the elephant is detected, and this ring 91S rm is used as the boundary line to extract the 1-power image [a specific image characterized by outputting only the data of the elephant, 1 elephant is extracted and plate-made. Method.