JPH07125186A - Image position correcting apparatus - Google Patents

Abstract

PURPOSE:To remove the position accuracy error in the inspection of a printing plate or printed matter. CONSTITUTION:In an apparatus reading the printing plate or printed matter 1 formed by a computer or a scanner 5, when the printing plate 7 or printed matter 1 is read by a reading sensor 2, the read image data is data of a printing image obliquely read from the relation between the speed performing the reading scanning of the printing plate or printed matter and the feed speed sending the printed plate or printed matter. Therefore, positional deviation with image data is generated and an error is generated in an inspection result. In order to eliminate this positional error, the reference data (a) formed from image data (c) is subjected to preliminarily stepwise shifting processing by an image position correcting circuit 13 and comparison inspection is performed by a comparator 4.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an image position correcting device, and more particularly to an inspection device for inspecting a plate or printed matter.

[0002]

2. Description of the Related Art Conventionally, an inspection apparatus for printed matter has a structure as shown in FIG. 3, and when the printed matter 1 is artificially confirmed and it is determined that there is no problem, the reading sensor 2 scans and reads the printed matter 1. The reference data a is stored in the storage device 3. After that, the reference data a and the read data b were compared by the comparator 4 to determine the quality.

However, this method has drawbacks such as waste of time until the printed matter is artificially confirmed and reference data cannot be obtained when inspecting the printing plate.

Therefore, as shown in the print quality inspection apparatus described in Japanese Patent Application No. 02-245743 (see FIG. 4), the output device 6 is controlled by the image data c created by the computer or the scanner 5. After that, the printing plate 7 is created, the printing plate 7 is set, and the printing material 8 is created by the printing machine 8. The image data c is stored in the storage device 9 and averaged through the averaging device 10. The method used as the reference data a has been proposed and put to practical use.

[0005]

However, in the above conventional method, the reading speed of the reading sensor 2 for reading and scanning the printing plate 7 or the printed material 1 with respect to the image data c for creating the reference data and the printing plate 7 or the printed material. As shown in FIG. 6, a positional error d of the read image data 12 with respect to the print data image 11 occurs due to the relationship with the transport speed of 1.

This position error d has a drawback that it is necessary to loosen the comparison error detection value when the inspection result e is obtained by comparing with the reference data a.

The present invention has been made in view of the above conventional circumstances, and therefore an object of the present invention is to provide a novel image position correcting apparatus capable of solving the above conventional defects. .

[0008]

In order to achieve the above object, an image position correcting apparatus according to the present invention includes a computer or a scanner, an output device for outputting image data from the computer or the scanner, and the output device. A printing machine for printing the contents of a printing plate created by image data output from the storage device, a storage device for storing the image data, and an averaging device for averaging the image data output from the storage device, In an image position correction device having a reference data output from the averaging device and a comparator for comparing image data from the printing plate or printed matter, an image position correction circuit between the storage device and the averaging device. Is provided and configured.

In the present invention, in order to correct the position error e of the image data, the image position correction circuit shown in FIG. 2 is inserted in the portion for making the reference data a from the image data c stored in the memory 9. As shown in FIG. 5, the reference error a corresponding to the position error d of the read data b is created in advance to correct the position error d and improve the comparison accuracy.

[0010]

BEST MODE FOR CARRYING OUT THE INVENTION The present invention will now be described in detail with reference to the accompanying drawings, which is a preferred embodiment thereof.

FIG. 1 is a block diagram showing an embodiment of the present invention, and FIG. 2 is a block diagram showing a concrete example of the image position correction circuit shown in FIG.

Referring to FIG. 1, a printed matter with reference numeral 1,
The reading sensor 2 and the comparator 4, the computer or the scanner 5, the output device 6, the printing plate 7, the printing machine 8, the storage device 9, and the averaging device 10 are the same as those in the conventional example shown in FIGS. Is the same. The present invention is characterized in that the image position correction circuit 13 according to the present invention is provided between the storage unit 9 and the averaging unit 10.

As shown in FIG. 1, in the present invention, the positional error d caused by the relationship between the reading speed for reading the printing plate 7 or the printed matter 1 and the conveying speed for feeding the printing plate 7 or the printed matter 1 is shown in FIG. As shown, from the image data image 14 of the image data c to the image correction data image 1
By converting into 5, it is possible to correct the image positional relationship of the reference data a according to the read data b. A device for correcting to this equivalent positional relationship will be described in detail below.

Referring to FIG. 2, an image position correction circuit 13, which is a main part of the present invention, includes a line buffer memory 16 having a plurality of buffer memories L1 to L4 for sequentially storing image data, and the line buffer memory. Light dot counter 17 for setting 16 write dot addresses
A write line counter 18 for setting a write line address of the line buffer memory 16, a read dot counter 19 for setting a read dot address of the line buffer memory 16, and a line buffer memory 16
And a read line counter 20 for setting the read line address.

In FIG. 1, a plurality of line buffer memories L1 to L of the image position correction circuit 13 shown in FIG.
Image information to the line buffer memory 16 consisting of 4 L1
The image data c is written as the light dot counter 17 is sequentially added from the line in the arrow direction. When the writing of the L1 line is completed, the write line counter 18 is incremented, the address of the buffer line to be written is moved to the L2 line, and the image data c is similarly written to the L2 line. While repeating this operation to sequentially write a plurality of lines to the line buffer memory 16, the image data written to the line buffer memory 16 at the same time is read address counter (read dot counter 19
And the read line counter 20).

In this case, the read dot counter 19 sequentially reads in the direction of the arrow, but in the case of the present embodiment, the read line counter 20 starts reading from the L3 line, and the read dot counter 19 counts, for example. Scan until the value becomes 1/3, then switch the read line counter 20 to the L2 line, and the count value becomes 2
Scan until it becomes / 3, then read line counter 20
To the L1 line and read the remaining data (see FIG. 2).
The area indicated by the shaded area is read out) to obtain the image correction data c ′ as the corrected image data image 15 as shown in FIG. 5, and the inspection accuracy can be remarkably improved.

The switching of the start line of the read line counter 20 and the line during reading is variable as necessary as a value for approximately correcting the position error d.

[0018]

As described above, according to the present invention,
By performing the position correction of the image data, the position error d with the read data is corrected, and the accuracy of the inspection result e is significantly improved.

[Brief description of drawings]

FIG. 1 is a block diagram showing an embodiment of the present invention.

FIG. 2 is a block diagram showing an example of the image position correction circuit shown in FIG.

FIG. 3 is a diagram for explaining a conventional example.

FIG. 4 is a block diagram showing a conventional example.

FIG. 5 is a schematic diagram showing image data and corrected image data images.

FIG. 6 is a schematic diagram showing a printed material image and a read image image.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Printed matter 2 ... Read sensor 3, 9 ... Memory device 4 ... Comparator 5 ... Computer or scanner 6 ... Plate output device (plotter) 7 ... Printing plate 8 ... Printing machine 10 ... Averager 11 ... Print data image 12 ... Read data image 13 ... Image position correction circuit 14 ... Image data image 15 ... Image correction data image 16 ... Line buffer memory 17 ... Write dot counter 18 ... Write line counter 19 Read dot counter 20 ... Read line counter a ... Reference data b ... Read data c ... Image data c '... Image correction data d ... Position error e ... Inspection result

Claims (4)

[Claims] 1. An apparatus for comparing and inspecting image information created by a computer or a scanner as inspection reference data, and comparing and inspecting a printing plate created by the image information and printed material image information obtained by reading a printed material. An image position correcting device, which shifts in a stepwise manner according to an inclination angle calculated from a scanning speed and a conveying speed of a plate or a printed matter. 2. A computer or a scanner, an output device that outputs image data from the computer or the scanner, a printing machine that prints the contents of a printing plate created by the image data output from the output device, and A storage device for storing image data, an averaging device for averaging the image data output from the storage device, a reference data output from the averaging device, and image data from the printing plate or printed matter. An image position correction apparatus having a comparator for comparison, wherein an image position correction circuit is provided between the storage unit and the averaging unit. 3. The position correction circuit includes a line buffer memory having a plurality of buffer memories for sequentially accumulating the image data, a write dot counter for setting a write dot address of the line buffer memory, and a line buffer memory of the line buffer memory. It further comprises a write line counter for setting a write line address, a read dot counter for setting a read dot address of the line buffer memory, and a read line counter for setting a read line address of the line buffer memory. The image position correction device according to claim 2. 4. The line buffer memory is composed of first, second, third, ..., Nth buffer memories, and when writing the image data, the first, second, third, ... Second, third, ..., When sequentially writing to the nth buffer memory and reading the image data, the nth ... .. The image position correction apparatus according to claim 3, further comprising: a third buffer memory, a second buffer memory, a first buffer memory, and an area in which each of the buffer memories is equally divided and sequentially read out.