JPS6140682A - Pattern input device - Google Patents

Abstract

PURPOSE:To improve the recognition rate of an image pattern shape and to reduce readout processes by controlling a slice level setting circuit which sets the binary-coding level of an image by a slice level control part and making a read with a variety of slice levels. CONSTITUTION:The slice level control part 6 controls the slice level setting circuit 12 to read a sample pattern successively and automatically by an image input part 11 with a variety of slice levels, read data are stored in an image memory 13. The binary-coded image information is processed by an image processing part 14 to discriminate the shape of the image pattern and the number of defects in image pattern shape recognition of every level is recorded in a recognition defect counting and storage part 5 on the basis of the discrimination result. Then, the slice level control part 6 adjusts the slice level setting circuit 12 to the slice level value at the number of recognition defects is minimum. Then, a normal image pattern on a drawing is read with a set slice level to read the normal image pattern having the least number of recognition defects.

Description

DETAILED DESCRIPTION OF THE INVENTION (Technical Field) The present invention relates to a graphic input device using a base isometric ζ such as a CAD system.

(Prior Art) A conventional graphic input device has a structure as shown in FIG. 1, and has the drawback of Te.

(a) The image pattern is read by the image input section 1 and sent to the slice setting circuit 2. In the slice setting circuit 2, the image signal is A-D converted and compared with the value set by a human using a digital switch.However, setting the optimal value of the boundary value that sets the boundary between black and white image information is a human task. A large number of recognition errors occurred in the processing results of the rounded image processing section 4, which had to rely on intuition.

(b) Therefore, in order to reduce the number of recognition failures, the slice setting circuit 2 is reset, the image pattern is read again and again by the image input unit 1, and the image processing unit 4 processes it again.
This method had the drawback of requiring a large amount of man-hours.

SUMMARY OF THE INVENTION An object of the present invention is to provide a graphic input device that eliminates such conventional drawbacks. - (Structure of the Invention) According to the present invention, an image input unit that reads an image pattern;
A slice setting circuit sets the binarization level of the image read by the image input unit, an image memory stores the traveling image information binarized by the slice setting circuit, and a slice setting circuit sets the binarization level of the image read by the image input section; An image processing section that processes an image pattern and performs shape identification; a recognition defect counter that counts and stores the number of recognized defects based on the processing results of this image processing section; and a recognition defect counter that counts and stores the number of recognized defects based on the processing results of this image processing section; A graphic input device characterized in that it has a slice level control section that controls a slice setting circuit is obtained.

(Example) An embodiment of the present invention will be described below with reference to FIG.

FIG. 2 is a block diagram showing the structural concept of the present invention.
1 is an illumination device that uses a halogen lamp or tungsten lamp, an optical fiber, etc. that guides the illumination of the lamp onto the drawing to be read, a solid-state imaging power 1 camera or photomultiplier tube, and its peripheral circuitry. This is the input section. Reference numeral 12 includes an A-D conversion circuit that converts the analog image signal output from the image input section 1, and a comparison circuit that compares the A-D converted signal with the value set by the slice level control section 16. This is a slice setting circuit. 1
3 is an image memory that stores information binarized into white or black by the slice setting circuit 12; 14 is an image memory 1;
Hardware that thins the binarized image stored in 3, and if the recognized image is a closed loop, calculates the vertical, horizontal, and diagonal ratios of the inner diameter and identifies whether the image shape is 0 or mouth. It is an image processing unit consisting of logic, memory, minicomputer, and software. 5 is a counting circuit that counts and stores the number of patterns recognized as defective in the shape discrimination in the image processing unit 14;
This is a recognition failure counting storage unit composed of memory. 6 is a slice setting circuit 1 based on the memory contents of the recognition defect count storage section 5 so that the number of patterns recognized as defective is minimized.
This slice level control unit is composed of hard logic, a microcomputer, and software that controls the 2. The graphic input device of the present invention is constituted by the above-mentioned parts. Next, the principle of operation of the graphic input device of the present invention will be explained.

First, the shape and number of image patterns to be read are clearly determined, and sample patterns drawn by the same reporter using the same acupuncture tool, the same template, and the same density as the regular image patterns are used. Prepare a drawing that describes the regular image pattern to be read. Note that the shape and number of sample patterns are stored in advance in the graphic input device.

Next, the slice setting circuit 12 is controlled by the slice level control unit 6 to automatically set the sample pattern to the image input unit 1 at various slice levels in sequence.
1 increases reading and stores it in the image memory 13. The binarized image information stored in the image memory 13 is subjected to image processing in the image processing section 14 to identify the shape of the image pattern. Next, based on the identification result of the image processing unit 14, the image pattern shape U is
The number of recognition failures is counted and stored in the recognition failure count storage unit 5 for each slice level. Next, the slice level control unit 6 adjusts the slice setting circuit 12 to the slice level value at which the number of recognition failures is the least, based on the stored contents of the recognition failure count storage unit 15. Next, by reading the regular image pattern on the drawing at the slice level set by the method described above, it is possible to read the regular image pattern with the least number of recognition defects.

Furthermore, all the operations described above are performed automatically.

(effect) As described above, the present invention has the following effects.

(1) There is no need to rely on human intuition for setting the slice level for image pattern reading, and the recognition rate of image pattern shapes is improved.

(II) ij! ! This eliminates the need to change the slice level and reread the data many times in order to reduce the number of errors.
Reading time is significantly reduced.

[Brief explanation of the drawing]

FIG. 1 is a block diagram showing the structural concept of a conventional device, and FIG. 2 is a block diagram showing the structural concept of an embodiment of the present invention. 1.11... Image input section, 2,12...
- Slice setting circuit, 3, 13... image memory, 4, 11... image saturation section, 5... g
Orifu Ai count storage unit, 6...slice level control unit. 71

Claims (1)

[Claims] an image input unit that reads an image pattern; a slice setting circuit that sets a binarization level of the image read by the image input unit; and an image memory that stores image information binarized by the slice setting circuit; an image processing unit that processes the image pattern stored in the image memory and performs shape identification; a recognition failure counting unit that counts and stores the number of recognized failures based on the processing result of the image processing unit; and the recognition failure count. a slice level control section that controls the slice setting circuit based on the contents of the section.