JPH04204657A - Processing method for plate-making digital image - Google Patents

Abstract

PURPOSE:To automatically stick the image of a color original to a prescribed position inside a page by scanning/outputting the color original to which a positioning patch is stuck, and a block copy to which the positioning patch is stuck, by means of a different device, similarly, differently inputting this outputted signals into an image device, and carrying out the aligning of both patches inside this image processor. CONSTITUTION:The patch 3 is stuck to the color original 2, and it is magnified or reduced with the light source 1 of a general magnification measuring machine and an optical system 4, and projected on the block copy 6 to form a projection figure 2. At this time, a reference patch 5 is stuck to a position corresponding to the block copy, because the patch 3 is simultaneously, projected, as well. An image signal obtained by scanning the same color original having the sticking of the above-mentioned patch with a color scanner and a signal from the above-mentioned block copy are inputted into the image processor and displayed thereon. At the first stage, the images 2 from a scanner and the block copy do not align in positional relation, and, of course, the patches of them are not superimposed. At this time, the image 2 from the scanner is moved in parallel by the image processor or repeatedly rotated, to align.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to page editing in an image processing system for prepress. In particular, the present invention relates to a method for automatically pasting a desired image into a page at a predetermined position.

(Prior art) Image positioning in a digital image processing system for plate making is
This is done by hand while looking at a color monitor. This work was time consuming and was a bottleneck to improving productivity.

(Problems to be Solved by the Present Invention) In view of the problems of the prior art described above, an object of the present invention is to automatically position images by utilizing alignment of a plurality of patches pasted on each of a color original and a block copy. It's about what you do.

(Means for Solving the Problems) The method of the present invention for solving the above problems involves pasting a plurality of positioning patches on a color original and a printing plate, respectively, and scanning the color original with the positioning patches pasted on a color scanner. Similarly, the printing plate with the positioning batch pasted is scanned and outputted by another device, and this output signal is separately input to an image device, and the positions of both batches are aligned within this image processing device to create an image. Paste it into a predetermined position on the page.

More specifically, the present invention provides a digital image processing system for plate making using a color scanner, a block drafting machine, and a device with built-in computer image processing and page editing functions. The process of scanning the batch with a scanner to obtain the image and digital signal of the batch. The process of reading the positions of multiple batches pasted on corresponding locations on the block as digital signals. The process of inputting both of the above signals and determining the patch position on the side of the block. A method for processing digital images for plate making, which includes a step of automatically calculating and matching a batch signal on the manuscript side with a signal by a computer, and automatically pasting an image of a color manuscript at a predetermined position on a page. be.

(Example) Hereinafter, an example of the present invention will be described in detail based on FIGS. 1 to 6 showing examples.

Figure 1 shows a batch (3) pasted on a color original (2), and a light source (1) and optical system (4) of a general-purpose magnification measuring machine (not shown).
to enlarge or reduce the color manuscript (2) on the block (6).
) to create the projection map (2). At this time, the patch (3) is also projected at the same time, so paste the reference batch (5) at the corresponding position on the block (6). Positioning performed by the image processing system This is performed assuming that the position of the batch on this copy (6) is correct.

FIG. 2 shows an image signal obtained by scanning the same color document with the batch pasted thereon using a color scanner (not shown) and a signal from the above-mentioned master, which are input separately to an image processing device and displayed. It shows the positional relationship when

At the initial stage, the image (2) from the scanner and the image (2) from the copy are not aligned in position, and naturally their batches do not overlap. In this case, an image processing device repeatedly translates or rotates the image (2) from the scanner to match the image.

This operation is automatically performed by a computer within the image processing device.

Part 3 shows details around the batch in Fig. 2. The solid line multiple circles in FIG. 3 are black pixels, and the area surrounded by the multiple circles is white pixels. The black and white pixels may have 8-bit tones. This figure shows that the batch (3) and the reference patch (5) are not aligned.

Therefore, as shown in Figure 4, the center (
9), count the number of white and black pixels in the Y direction (7) and the X direction (8). When this value is compared with respect to the center (9) of the reference patch (5), both the left, right, top, and bottom do not have symmetrical values.

Translate and rotate the input color original so that these values are the same. When they are in the same position, the batch (3) and the reference patch (5) overlap as shown in FIG. Perform this operation for the upper and lower batches (3) and the reference batch (5), and if the state shown in Figure 5 is obtained for each set, it is determined that the input color image is at the correct position. If possible, paste the image in that location. If this operation is performed for all images on the page, the image pasting will be completed.

In the above description, the badge (3) and the reference badge (5) are attached to the side of the color original, but they may be placed above or below the color original, or at any other suitable location.

(Effects of the Invention) According to the present invention, since images are automatically aligned and pasted, productivity is greatly improved and unmanned operation of the image processing system is possible.

[Brief explanation of the drawing]

Figure 1 is a diagram explaining how to project a color original with a badge pasted onto the master using a magnification measuring device and pasting a reference batch onto the projected image. Figure 2 is an image of the color original and an image of the master. is displayed on the screen of the image processing device, Figure 3 shows the details of the vicinity of the second patch, and Figure 4 explains the misalignment between the color image and the original image and how to correct the misalignment. FIG. 5 is a diagram illustrating that the positions match without deviation, and FIG. 6 is a block diagram showing an example of an apparatus for carrying out the present invention. 2...Color original, 3...Batch, 5...Reference patch, 6...Print,

Claims (1)

[Claims] In a digital image processing system for plate making using a color scanner, a block drafting machine, and a device with built-in computer image processing and page editing functions, a color document is processed along with a plurality of positioning patches pasted on the document. A process of scanning with a scanner to obtain digital signals of the image and patches, a process of reading the positions of multiple patches pasted on corresponding locations on the block as digital signals, and inputting both of the above signals and converting them into patch position signals on the side of the block. A method for processing digital images for prepress, characterized by automatically pasting an image of a color original at a predetermined position on a page, including a step of automatically calculating and matching patch signals on the original by a computer.