JP2738279B2 - Image position correction device - Google Patents

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 apparatus, and more particularly to an inspection apparatus for inspecting a plate or a printed matter.

[0002]

2. Description of the Related Art Conventionally, a printed matter inspection apparatus scans and reads a printed matter 1 with a reading sensor 2 when a printed matter 1 is artificially checked and judged to be satisfactory, in a configuration as shown in FIG. It is stored in the storage device 3 as reference data a. After that, the comparator 4 compares the reference data a with the read data b to judge the quality.

[0003] However, this method has the drawbacks that there is a waste until the printed matter is artificially confirmed, and that reference data cannot be obtained when inspecting the printing plate.

For this purpose, as shown in a print quality inspection apparatus described in Japanese Patent Application No. 02-245743 (see FIG. 4), an output device 6 is output by image data c generated by a computer or a scanner 5. After the printing plate 7 is created, the printing plate 7 is set and the printed matter 1 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. A method of using the reference data a has been proposed and put into practical use.

[0005]

However, in the conventional method described above, the reading speed of the reading sensor 2 for reading and scanning the printing plate 7 or the printed matter 1 with respect to the image data c for creating the reference data, and the printing speed of the printing plate 7 or the printed matter. 6, a position error d of the read image data 12 with respect to the print data image 11 is generated as shown in FIG.

The position error d has the disadvantage that it is necessary to make the detected value of the comparison error smaller when the inspection result e is obtained in comparison with the reference data a.

SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned conventional circumstances, and an object of the present invention is to provide a novel image position correcting apparatus which can solve the above-mentioned conventional disadvantages. .

[0008]

To achieve the above object, an image position correcting apparatus according to the present invention comprises a computer or scanner, an output device for outputting image data from the computer or scanner, and the output device. A printing machine that prints the contents of a printing plate created by image data output from a storage device that stores the image data, and an averaging device that averages the image data output from the storage device, An image position correction device having a comparator for comparing reference data output from the averaging device and image data from the printing plate or printed matter, wherein an image position correction circuit is provided between the storage device and the averaging device. Is provided.

According to the present invention, the image data c stored in the storage 9 is corrected in order to correct the position error d of the image data.
The image position correction circuit shown in FIG. 2 is inserted into the portion where reference data a is created from
By creating the reference data a corresponding to the position error d, the position error d is corrected and the comparison accuracy is improved.

[0010]

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a block diagram of a preferred embodiment of the present invention.

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

Referring to FIG. 1, a printed matter denoted by 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 press 8, the storage device 9, and the averaging device 10 are the same as those of 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 device 9 and the averaging device 10.

As shown in FIG. 1, in the present invention, the position error d generated from the relationship between the reading speed for reading the printing plate 7 or the printed material 1 and the transport speed for sending the printing plate 7 or the printed material 1 is shown in FIG. As shown, the image data c of the image correction data image 1
5, the image positional relationship of the reference data a can be corrected in accordance with the read data b. An apparatus 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 a line buffer memory 16. Write 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 read line counter 20 for setting the read line address.

In FIG. 1, the stored image data c is obtained from a storage unit 9 and a plurality of line buffer memories L1 to L of an image position correcting circuit 13 shown as a block diagram in FIG.
Image information to the line buffer memory 16 comprising L1
Image data c is written as the light dot counter 17 is sequentially added from the line in the direction of the arrow. 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 shifted to the L2 line, and the image data c is similarly written to the L2 line. By repeating this operation and sequentially writing a plurality of lines to the line buffer memory 16, the image data simultaneously written to the line buffer memory 16 is read by a 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. In this embodiment, the read line counter 20 starts reading from the L3 line. The scan is performed until the value becomes 1/3, then the read line counter 20 is switched to the L2 line, and the count value becomes 2
/ 3, and then read line counter 20
To the L1 line and read the remaining data (FIG. 2).
Is read out) to obtain 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 between the start line of the read line counter 20 and the line in the middle of reading is varied 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 respect to the read data is corrected, and the effect of significantly improving the accuracy of the inspection result e is obtained.

[Brief description of the drawings]

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

FIG. 2 is a block diagram illustrating an example of an image position correction circuit illustrated in FIG. 1;

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 print image and a read image image.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Printed matter 2 ... Reading sensor 3, 9 ... Storage device 4 ... Comparator 5 ... Computer or scanner 6 ... Plate output device (plotter) 7 ... Printing plate 8 ... Printing machine 10 ... Averaging device 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)

(57) [Claims] An apparatus for comparing and inspecting image information created by a computer or a scanner as inspection reference data with a printing plate created based on the image information and print image information obtained by reading a printed material is provided. Correction that shifts step by step according to the inclination angle calculated from the scanning speed and transport speed of the plate or printed matter
An image position correcting apparatus, comprising: an image position correcting circuit that performs the following. 2. The image position correction circuit is formed by the computer or the scanner, an output device for outputting image data from the computer or the scanner, and image data output from the output device. A printing machine for printing the contents of the printing plate obtained, a storage for storing the image data, an averager for averaging the image data output from the storage, and an output from the averager claim further characterized in that provided between the reference data and the printing plate or a comparator and Contact Keru the storage unit to the image position correction apparatus having a comparing the image data from the printed matter averager
2. The image position correction device according to 1. 3. A line buffer memory having a plurality of buffer memories for sequentially storing the image data, a write dot counter for setting a write dot address 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 correcting apparatus according to claim 2, wherein 4. The line buffer memory is constituted by first, second, third,..., N-th buffer memories, and when writing the image data, the first buffer memory is used. , The second, the third,..., The n-th buffer memory in order, and the n-th,. 4. The image position correcting apparatus according to claim 3, further comprising sequentially switching and reading out the areas obtained by dividing the buffer memories into n equal parts in the order of the third, second, and first buffer memories.