SU1718251A1 - Object pattern flaw recognizer - Google Patents

Abstract

The invention relates to automation and computer technology and can be used in printed circuit board inspection systems. The purpose of the invention — improving the accuracy of the device — is achieved by introducing a mode setting unit and a data input unit for the standard. This allows you to control defects such as Reduced Conductor Width and Reduced Distance Between Conductors. 1 il.

Description

The invention relates to computing and can be used in quality control systems for printed circuit boards.

The purpose of the invention is to improve the accuracy of the device.

The drawing shows a diagram of the device.

The device comprises a control unit 1, a recognition mode setting unit 2, a zone parameter analysis unit 3, two zone boundary shaping units 4 and 5, a unit for entering data on the standard 6, a television sensor 7.

The recognition of object image defects consists in the fact that the image of the object standard is divided into rectangular control zones, within which the video signal has the same level corresponding to the white or black level.

Digital information about the reference in the form of YI, Ґ2, Xi, X2 coordinates of white and black zones during the time frame of a television scan

compared with image information of a controlled object.

If there is a discrepancy between the signal level, bounded by the coordinates of the zone, given by the level of this zone, the device fixes the defect. Digital information about the parameters of the standards zones is formed in advance, taking into account the tolerances.

The device works as follows.

The command of the control unit 1 transfers from this block to the blocks for setting the recognition mode 2, analyzing the parameters of zones 3, forming the boundaries of zones 4 and 5 of digital information on the number of white and black zones, on the parameters Y1, Y2, X1, X2 of the control zones, respectively . This information is located in the RAM of these blocks. After sending the data, the control unit issues a command to start the control. The recognition mode setting unit 2 selects the first full frame after the arrival of the command, synchronized with XI and FID pulses from the television sensor. Block 2

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specifying the recognition mode generates string quantization pulses attached to the front of the FID, and normalizes the video signal of the image.

For a time equal to the duration of the image line, the zone parameter analysis unit 3 goes through the parameters Yi, Y2 of the control zones and checks the condition

, (one)

where YJ is the line number greater than 1 than the current line number.

Simultaneously with this process, in the two blocks 4 and 5 of forming the boundaries of the zones, the coordinates Xi and Xa of the control zones are searched ..

The signal corresponding to the fulfillment of condition (1) gates writing to the buffers of the boundaries of the Xi and X2 coordinate zones for each row. On the next row, these buffers output signals corresponding to the control sections in terms of white and black inside the row.

These signals, which come from blocks 4 and 5 of the formation of zone boundaries in block 2 of the task of recognition mode, gate the comparison of the video signal with the corresponding level inside each row. If there are video signal level anomalies within the control zone, the recognition mode setting unit 2 fixes the coordinates of the detected image rejects.

In the mode of forming standards, by the command of the control unit 1, the assignment mode of the recognition mode is synchronized by the signals of the CCI of the CSRI of the television sensor 7 and outputs the quantizing pulses of the image line in the block 6 of the data input about the standard.

In the latter, a black or white zone of any size is formed taking into account the tolerance for deviations. After the zone is checked for compliance with the selected white or black level with the reference image, the coordinates X i, X 2, Yi, Y2 of the control zone are recorded by the control unit 1 on the information carrier.

Claims (1)

Apparatus of the Invention A device for detecting defects of images of objects, comprising a television sensor, a control unit, a zone parameters analysis unit and two zone boundary formation units, characterized in that, in order to improve the accuracy of device, the recognition mode setting block and the reference data input block are entered into it, the information output of the television sensor is connected to the first information input of the recognition mode setting block, and the synchronization output is connected to the horizontal and frame synchronization input of the recognition mode block, the outputs of the first and second blocks the formation of zone boundaries is connected to the second and third information inputs of the mode setting unit, the first and second inputs of the control unit are connected to the fourth and fifth information inputs the mode setting unit, the first output of which is connected to the first control input of the standard data block, the second output to the first control inputs of the first and second zone boundary formation blocks, the second control inputs of the first and second zone boundary formation blocks, the first control input the zone analysis unit and the second control input of the standard data input unit are connected to the third output of the mode setting unit, the second control input of the zone parameter analysis unit is connected to the fourth output of the mode setting unit , the third output of the control unit is connected to the clock input of the mode setting unit, the fourth output is connected to the synchronization input of the standard data input unit, the second output is connected to the first information inputs of the zone parameters analysis unit, the first and second zone boundary formation units and the standard data input unit , the fifth output of the mode setting unit is connected to the information input of the control unit and to the second information input of the data input unit on the standard, the sixth output - to the second information inputs of the first and second photo units reconstructing the boundaries of zones and the third information input of the data input unit about the standard, the seventh output - with the second information input of the zone parameters analysis unit and the fourth information input of the data input block about the standard, the eighth output - with the third information inputs of the zone parameters analysis unit and the first and second blocks forming the zone boundaries; the output of the zone parameter analysis block is connected to the fourth information inputs of the first and second blocks. forming the boundaries of the zones.