JPS62131294A - Display inspector - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a display inspection device for inspecting dot matrix type liquid crystal display characters read out by scanning with a photoelectric conversion scanner.

[Conventional technology]

Conventional technology - r is, for example, H, A, GIucks
man”A Propagation pattern
classifier' IEEE Trans, EC
14pp434-443.1965, there is a method of identification based on transmission patterns. This method is
This method transmits information about the frame from the cut out character frame, and then identifies the character by determining the area of the background that is not conveyed by the stroke of the character.

Next, the method will be explained in detail with reference to the drawings.

Figure 6 is an explanatory diagram of the principle of the identification method based on transmission patterns, and is an explanatory diagram of the calculation for distinguishing between 1UI and 1H", for example. As shown in fal of the same figure, first, move from the right observation frame to the left. convey information;

This transmission stops when it reaches the characters, so a back shadow part that is shadowed by the characters remains. Similarly, if the transmission is performed from the left observation frame, the result will be as shown in figure fb), and if the same calculation is performed from the upper frame and the shadowed part disappears as shown in figure 3 (c), then I It can be determined that it is Ul. Identification of other characters can also be performed by combining these operations.

[Problem that the invention seeks to solve]

Using the conventional transmission pattern identification method described above,
In the method of inspecting dot matrix type LCD display characters, if there are gaps between dots, the strokes are discontinuous and the transmission pattern does not stop even when it reaches the character, making recognition impossible. In addition, in the conventional method, since the displayed characters are introduced and inspected, it is possible to judge whether the characters are good or bad, but it is impossible to detect defective dot locations.

[Means for solving problems]

The display inspection device of the present invention scans and reads dot matrix type liquid crystal display characters with a photoelectric conversion scanner.
A binarization circuit that converts the text into a binarized image of 0", 111, a mesh generation circuit that detects a character area from the binarized image and divides it into the number of dots, and , 11″ in each mesh divided by the mesh generation circuit
The number of bits is counted and this count value is compared with the reference value to determine whether each dot pattern is displayed.If it is determined that the dot pattern is displayed, it is determined as 111, and if it is determined that it is not displayed, it is determined that the dot pattern is displayed. is a pattern generation circuit that generates a dot matrix pattern as 10'', and a pattern judgment that compares the generated dot matrix pattern with a standard pattern registered in advance corresponding to characters and determines whether or not they match. It consists of a circuit.

〔Example〕

Next, embodiments of the present invention will be described in detail with reference to the drawings.

FIG. 1 is a block diagram of a display inspection device provided by the present invention, in which an input image 32 read out by scanning a photoelectric conversion scanner 31 is converted into a binary image 34 by a binarization circuit 33. be done. This binarized image 34 is input to a pattern generation circuit 37, and is further input to a mesh generation circuit 35.
The number of bits in each mesh divided by the mesh signal 36 outputted from the mesh is counted, and it is determined whether the dot pattern in each mesh is displayed or not according to the count value, and a dot matrix is created. Pattern 38 is output. A pattern determination circuit 39 compares the dot matrix pattern 38 and the lJ quasi-pattern 41, and outputs a determination signal 40 indicating whether they match.

The present embodiment will be described in detail below with reference to the drawings.

Figure 2 shows the operation of the mesh generation circuit that detects the display character area from the input binary image of an IJ box type liquid crystal display character and divides it into dots. It is a figure for explaining.

As shown in the figure, when performing display character inspection, first, all dots in the dot matrix are set to a display state, and the input binary image 1 is captured by scanning the photoelectric conversion scanner. , the first image on the dot matrix in each of the horizontal and vertical directions is detected as the starting position [12]. Furthermore, the starting position f
2, messages 7:L3 are generated at preset intervals corresponding to the number of dot matrices.

FIG. 3 shows a configuration diagram of the mesh generation circuit.

In the figure, a start position signal 6 is latched by a mesh position latch 11 by a start position latch signal 5, and compared with a scanning position signal 7 by a comparator 12 as a mesh position signal 15, and a mesh signal 9 is output. Further, the mesh position signal 15 is added to the mesh interval signal 8 in the adder 13, and is latched again in the mesh position latch 11 as mesh change data 16 indicating the next mesh position, and the next mesh position signal 9 is It is output using the same process as described above. This mesh signal 9 is input to a counter 14, and when a preset number of mesh signals 9 are output, an end signal 10 is output.

FIG. 4 is a diagram for explaining the operation of the pattern generation circuit. In the figure (a), the input binarized image 20 is divided into meshes 21 generated by the mesh generation circuit,
The number of 111 bits in each mesh is counted, and based on the count value, it is determined whether the dot pattern in each mesh is displayed or not. If it is determined that the dot pattern is displayed, 111 bits are counted.
1. If it is determined that there is no display, the same figure as “IO” (
Generate the dot matrix pattern shown in bl.

FIG. 5 shows a block diagram of the pattern generation circuit. In the figure, the binarized image 22 is input to a shift register 23, and the output signal of the shift register is input to a delay circuit 24, and the output signal of the shift register 23 is ai,j (i=1 ~N, j=1~M) NXM
A Bit parallel signal 25 is output. This parallel signal 25 is added by the mesh signal 30 in the adder 2b, and is output as the number of bits in the mesh, 27.

This added bit number 27 is compared with a reference value 29 by a comparator 28, and a determination signal 44 indicating whether the dot pattern in each mesh is displayed or not is output.

〔Effect of the invention〕

The display inspection device of the present invention divides a dot matrix type liquid crystal display character into meshes corresponding to the number of dots, and further counts the number of 111 bits in each mesh to determine whether each dot pattern is displayed. Since the method uses a method that performs judgment, generates a dot matrix pattern, and then compares it with a standard pattern, it is possible to recognize discontinuous displayed characters, which is a drawback of conventional methods. It is also possible to detect defective dot positions.

[Brief explanation of drawings]

Fig. 1 is a block diagram of a display inspection device showing an embodiment of the present invention, Fig. 2 is an explanatory diagram of the operation of a mesh generation circuit, Fig. 3 is a configuration diagram of the mesh generation circuit, and Fig. 4 fa), (b).
) is an explanatory diagram of the operation of the pattern generation circuit, the fifth section is a configuration diagram of the pattern generation circuit, and FIG. ... Binarized image, 2 ... Start position, 3 ... Mesh, 4 ... Imaging area, 5 ... Start position latch signal, 6 ...
...Start position signal, 7...Scanning position signal, 8...Mesh interval signal, 9...Mesh signal, 10...End signal, 11・・・・・・
...Mesh position latch, 12...Comparator, 13...Adder, 14...Counter, 15...Mesh position signal, 16...
...mesh change data, 20...binarized image, 21...mesh, 22...binarized image, 23...shift register, 24...
...Delay circuit, 25...Parallel signal, 26
...Additional X section, zs...Comparator, 29...Reference value, 30...Mesh signal, 31...Photoelectric conversion scanner , 32...
...Input image, 33...Binarization circuit, 34.
...Binarized image, 35...Mesh generation circuit, 36...Mesh signal, 37...
・Pattern generation circuit, 38...Dot matrix pattern, 39...Pattern judgment circuit, 40
...Judgment signal, 41...°°° standard Ap-y
・44°°°°°°judgment signal・ ,,/---～,
Agent Patent Attorney Susumu Uchihara \2, No. 1 Figure 3/--1 Photoelectric scanner 33-24, IJT, ? Each, 35-・Mesh generation times each 37°-8° turn occurrence times ΣEach 39-----V7-n size main circuit fan 3 Figure//-m-Metshusu Tateishi Yu, 7chi/2-- - Konno YL-Goo/3- Addition section, Otsubo Counter 4 side $5 Figure 2z 24-・-浬μIli] 路2z...-Power of name? 23・---Gonhalder*,<Fig.

Claims (1)

[Claims] A binarization circuit that converts dot matrix type liquid crystal display characters read out by scanning with a photoelectric conversion scanner into a binary image of '0' and '1', and a display character area is detected from the binary image. and a mesh generation circuit for dividing the binarized image into the number of dots, and counting the number of '1' bits in each mesh divided by the mesh generation circuit in the binarized image, and comparing this count value with a reference value. A pattern generation circuit generates a dot matrix pattern as '1' and '0' if it is determined that each dot pattern is displayed, and the generated dot matrix. A display inspection device comprising: a pattern determination circuit that compares a pattern with a standard pattern registered in advance corresponding to a character and determines whether or not they match.