SU968834A1 - Device for registering oversized particles - Google Patents

Description

The invention relates to automation and computer technology, and can be used in instrumentation for registering randomly distributed particles in the image, in particular for controlling the number of defects of certain sizes on an electrophotographic microfiche

A known device for detecting particles by size, containing a scanning unit, an image analysis unit and a recorder, the principle of which is based on scanning the entire image field and recording the number of particles falling within the set size range [1].

A disadvantage of the known device is the relatively low processing speed of large format images.

The closest in technical essence is a device for detecting particles exceeding a specified size, containing an image reading unit, the outputs of which are connected through a particle counter to the input of the registration unit, a chronometer, the first and second outputs of which are connected respectively to the input of the horizontal unit and to the first input of the vertical block, the scanners whose outputs are connected to the inputs of the image reading unit ⁵ (2].

A disadvantage of the known device is the relatively low processing speed of large format images.

The purpose of the invention is to increase the processing speed of large format images, increasing the speed of the device.

This goal is achieved by the fact that in the device for recording particles exceeding the specified size, containing an image reading unit, the outputs of which through a particle counter are connected to the input ^ of the registration unit, a chronizer, the first and second outputs of which are connected respectively to the input of the horizontal unit and to the first the input of the vertical unit, the outputs of which are connected to the inputs of the image reading unit, an analog-to-digital converter and a code comparison unit, an image reading unit are introduced it is made of a photodetector matrix and an integrating photocell, which are rigidly bonded to each other, the outputs of the photodetector matrix of the image reading unit are connected to the inputs of the particle counter, the output of the integrating photocell of the image reading unit is connected to the first input of the analog-to-digital converter, whose output is connected to the first. the input of the code comparison unit, the output of which is connected to the second input U of the vertical scan unit, the third and fourth outputs of the chronizer are connected to the second inputs of the analog-to-digital converter and the code comparison unit. ,

In FIG. 1 shows the location of the image reading unit; in FIG. 2 is a block diagram of a device.

A device for detecting particles exceeding a specified size, 20 comprises an image reading unit 1 made of a photodetector 2 and an integrating photocell 3, a particle counter 4, a registration unit 5, a chroniser 6, a horizontal scan unit 25, a vertical scan unit 8, analog-to-digital Converter 9 and block 10 code comparison The device operates as follows. thirty

The horizontal scanning unit 7 scans the image strip, the photodetector array 2 reads the image and provides image signals to the particle counter 4, in which 35 the dimensions of the defects are measured and counted. If defects with partially acceptable or not acceptable sizes are detected, the number of particles is issued to the registration block 5 4Q, which performs the registration of defects. Simultaneously with scanning the i-th strip, the area (i + l) -; ofl strip is monitored using an integrating photocell 3, which, depending on the total area of defects in the field of view of the photocell, gives a signal, for example voltage, to the analog-to-digital converter 9, which converts into a code with the arrival of pulses 50 from the chroniclers.

From the analog-to-digital converter 9, the code corresponding to the level ' ^{J of the} signal of the integrating photocell is supplied to the code comparison unit 10, in which the incoming code is compared with the set value code. If the received code • during scanning of the strip never exceeded the set, then 60 is remembered and at the end of the strip a signal is sent to the vertical scanning unit 8 so that the image reading unit 1 moves down two steps, i.e. set to (1 + 2) -th _65th band. If the received code has exceeded the set, then the vertical scanning unit 8 receives the corresponding signal and performs one step down, i.e. the image reading unit 1 is set to the (i + 1) th strip. The chronizer 6 controls the operation of horizontal and vertical blocks 7 and 8, provides a clock series of pulses to an analog-to-digital converter 9, and resets the signal coming from block 10 of the comparison codon to vertical block 8 at the beginning of scanning of each band.

A case is possible when several small defects fall into the zone controlled by the integrating photocell 3, but their total area exceeds the set value, then this strip is scanned, but the particle counter 4 does not count these defects.

It is possible to install a second photodetector array instead of an integrating photocell 3, but the volume and complexity of the 4 particle counter will increase significantly.

Using the device will increase the processing speed of microfiche image information and may find application in the analysis of large format images containing a small number of objects or microparticles.

Claims (2)

1. Authorship certificate of the USSR 444225, cl. G On M 11/02, 1970. 2. USSR author's certificate 307413, class G On M 11/02, (prototype).