JPH0297946A - Original plate inspecting device - Google Patents

Abstract

PURPOSE:To prevent the generation of a check miss by projecting a difference part between new and old original plates in the same size as the original plate on the original plate on a light table setting an original plate with a projector. CONSTITUTION:An original plate film 18 is placed on the light table, the transmitted image is scanned by a CCD camera 10, and image data are inputted to an image processor 11. By the control of a CPU 12 for a control, the image data are stored into a multivalue image memory 14 and a binary image memory 16, the positioning of the new and old data is executed, the difference part is detected, and the result is stored into the binary image memory 16. In a projector output interface part 20, the data in the binary image memory 16 is called, and the difference part between the new and old original plate data is outputted to the projector. Since the difference part between the new and old original plate is projected in the same size as the original plate on the original plate on the light table to be the original plate platen with the projector, a worker does not need to frequently move a sight line between a monitor screen and the new original plate, and the check miss can be prevented.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to an original inspection device for checking whether an original film created after proofreading in the field of plate making has been corrected according to the proofing paper.

[Conventional technology]

FIG. 5 shows a conventional original inspection method, (a) is a block diagram of the inspection processing method, and (b) is a diagram for explaining the inspection method.

A revised new original version C is created in accordance with the proof sheet on which the proofreader has added correction instructions to the proof copy of the old original version A before correction. These old original version a and new original version C are input as image data by a camera, and after data processing, the data of the new and old original version is compared and judged, and the difference between the new and old original version is displayed blinking on the TV monitor screen d (in the figure, it is called rpJ). The "mark" is blinking). Operator e then either visually checks this blinking position and the corresponding position on the new master plate to confirm whether the correction has been made as instructed on the proof sheet, or after marking the blinking area. Then, the original is inspected by taking it to another light table and checking whether it has been corrected according to the proof sheet.

[Problems to be Solved by the Invention] In the above-described conventional original plate inspection method, the operator e needs to search for a correction point on the new original plate C that corresponds to the flashing display of the different part, and the operator e has to check the monitor screen d and the new original plate C. As a result of frequently shifting the line of sight between the two, it is easy to make mistakes such as mixing up the parts to be checked or omitting a check. Furthermore, since the display on a television monitor screen is not the actual size, it is difficult to grasp the positional relationship between the blinking display and the correction location on the original, which facilitates the occurrence of the above-mentioned mistakes.

The present invention solves the above-mentioned problems, and aims to provide an original plate inspection device that can prevent the occurrence of check errors.

[Means to solve the problem]

To this end, the original plate inspection apparatus of the present invention includes a light table on which the original is placed, a camera for inputting an image of the original, means for comparing and determining image data of the old and new originals input from the camera, and a means for comparing and determining the image data of the old and new originals input from the camera. and means for projecting and displaying the difference between the image data of the new and old originals by the determining means onto the original on the light table, and the projection of the difference is made to be the same as the dimensions of the original on the light table. be.

[Effect]

In the present invention, for example, as shown in FIG. 4, an old original is placed on a light table, gradation data is input into a storage device using a CCD camera, and then the new original is input in the same manner. These old and new data are then subjected to image processing, the new and old data are compared to calculate the differences, and the differences are then projected and displayed on the new original plate or proof sheet on the light table.

〔Example〕

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a system configuration diagram showing one embodiment of the original inspection device of the present invention, FIG. 2 is a perspective view showing one embodiment of the original inspection device of the present invention, and FIG. 3 is a system configuration diagram showing one embodiment of the original inspection device of the present invention. FIG. 4, which is a diagram showing the flow of the control system, is a diagram for explaining the plate inspection method according to the present invention.

In FIG. 1, a camera 10 is, for example, a CCD camera, which scans a transparent image of an original film and inputs the image data to an image processing device 11.

In the image processing device 11, the image data is synchronized with the scanning speed of the camera, and the camera input interface section 13 having an 8-bit A/D converter converts the image data into a 256-gradation digital signal, which is converted into a multivalued signal. The image processor 15 binarizes the multi-valued data in the multi-valued image memory 14 and stores it in the binary image memory 16, and also converts the multi-valued data in the multi-valued image memory 14 and the binary image into After aligning the old and new data in the memory 16, the identity of the old and new data is compared and determined, a difference is detected, and the result is stored in the binary image memory 16.

Furthermore, in the projector output interface section 20,
The data in the binary image memory 16 is called up, and the difference between the old and new original data is output to the projector.

The control CPU 12 controls the entire functions of the image processing device 11 through an internal control bus, and causes the image processing device 11 to perform predetermined operations in accordance with commands sent from the control microcomputer system 22 through the command data interface 19. It is something.

On the other hand, the processing data in the image processing device 11 is connected to the system bus of the control microcomputer system 22 via the dual port image memory 17 connected to the image bus. A large-capacity hard disk 41 is connected to the bus, and data of a multilevel image memory 14 and a binary image memory 16 are stored therein. Conversely, data stored in the hard disk 41 can be read out to an image memory or the like in the image processing device 11 via this dual port image memory 17.

Since a large number of old original versions can be stored using this large-capacity hard disk, even if the old original version is directly modified to create a new original version, it can be stored and compared with the new version, making effective use of this device. can.

FIG. 2 is a perspective view showing one embodiment of the original plate inspection device of the present invention, in which a light table 30 is provided below the projector 21 and the CCD camera 10, and the image processing device 11 and the control microcomputer system 22 are installed. A mounted control box 31 is provided.

FIG. 3 shows the processing flow of the inspection method of the present invention.
First, the old original is placed on the light table 30, gradation data is inputted by the CCD camera 10, and then the gradation data of the old original is stored in the multivalued image memory (■). The same process as above is performed for the new original version (■), the data of the new original version and the old original version are compared (■), and the calculation result, that is, the difference between the new original version and the old original version, is stored in the binary image memory ( ■
).

As a comparison operation, for example, if the absolute value of the difference in gradation between the new original and the old original exceeds a certain criterion for one pixel, it is assumed that there is a difference, and "l" is stored in the binary image memory. Assuming that the other parts are the same, "0" is stored.

Finally, based on the difference data between the new and old originals in the binary image memory, the difference is projected and displayed on the new original or proof paper placed on the light table with the light turned off, using the number of projections (■).

When projected onto the proof sheet, if there is no indication of the difference where there is a correction instruction, the correction was forgotten, and if there is a difference indication where there is no correction instruction, it is a change other than the correction instruction and it is a new original version. It turns out that there was a mistake in the creation. If a discrepancy is indicated where a correction is directed, check the new original version to see if the correction has been made correctly.

FIG. 4 is a diagram for specifically explaining the above processing. First, place the old original plate a on the light table 30, and
The gradation data is input using the CD camera 10 (a), and then the new original version C is input in the same manner (a). After calculating the old and new data, the projector displays the difference on the new original or proof sheet on the light table, which is turned off.

That is, the embodiment of this apparatus has the configuration shown in FIG. 3 to reduce the work of transcribing the different parts of the old and new plates to the new version, and to prevent omissions in inspection due to transcription errors. For this purpose, if the projection display of the different parts onto the new original on the light table 30 is made to have the same dimensions as the original, the different parts on the new original and the display by the projector will be in the same position,
The inspection will be reliable. As can be understood from the above example, the most important point of the present invention is to project and display the different portions on the new original on the light table or on proofing paper in the same size as the original.

〔Effect of the invention〕

As described above, by using a projector to project the different parts of the old and new originals onto the original on the light table, which is the original plate mounting base, with the same dimensions as the original, the operator can monitor the differences as in the conventional original inspection method. There is no need to frequently shift the line of sight between the screen and the new original version, and it is possible to prevent teasing errors.

[BRIEF DESCRIPTION OF THE DRAWINGS] FIG. 1 is a system configuration diagram showing one embodiment of the original inspection device of the present invention, FIG. 2 is a perspective view showing one embodiment of the original inspection device of the present invention, and FIG. 3 is a system configuration diagram showing one embodiment of the original inspection device of the present invention. FIG. 4 is a diagram showing the flow of the control system in the original plate inspection apparatus of the present invention, FIG. 4 is a diagram for explaining the plate inspection method according to the present invention, and FIG. 5 is a diagram for explaining the conventional original plate inspection method. 10... Camera, 11... Image processing device, 12...
- Control CPU, 13... Camera input interface, 14... Multivalued image memory, 15... Image processor, I6... 2-direct image memory, 17...
・Dual tenth image memory, 19... Command data interface, 20... Projector output interface, 21... Projector, 22... Control microcomputer system, 23... Hard disk, 30...・Light table. Applicant Dai Nippon Printing Co., Ltd. Representative Patent Attorney Hiroki Shirai (5 others) Figure 2 Figure 5

Claims (1)

[Claims] (1) A light table on which the original is placed, a camera for inputting an image of the original, a means for comparing and determining the image data of the old and new originals input from the camera, and an image of the old and new originals by the comparison and determining means. 1. An original inspection apparatus comprising means for projecting and displaying a data difference part onto an original on a light table, the projection of said difference part being made to have the same dimensions as the original on the light table.