External synchronous signal card and image collection system for linear array camera

Abstract

The invention discloses an external synchronous signal card and an image collection system for a linear array camera. The external synchronous signal card for the liner array camera comprises an impulse signal input end for receiving first impulse signals, an external synchronous trigger signal output end for outputting external synchronous trigger signals, and an impulse signal processing module which is respectively connected with the impulse signal input end and the external synchronous trigger signal output end. The impulse signal processing module can be used for performing level switching on the first impulse signals to obtain external synchronous signals and counting the first impulse signals when the impulse signal input end receives the first impulse signals. The embodiment of the external synchronous signal card and the image collection system for the linear array camera can control the linear array camera to collect images in preset areas and has the advantages of being high in quality of image collection.

Description

technical field [0001] The invention relates to the technical field of image processing, in particular to an external synchronous signal card for a line array camera and an image acquisition system for a line array camera with the card. Background technique [0002] The external synchronization signal card (device) of the line array camera is a device that can receive the output pulse of the encoder and provide an external synchronization trigger signal for the line array camera. The existing line scan camera external synchronization signal card is large in size, inconvenient to install, high in production cost, and usually can only complete the conversion from RS-422 level to LVDS level, resulting in single function and limited practicability. In addition, because the existing line-scan camera external synchronization signal card does not have the function of controlling the image acquisition area of ​​the line-scan camera, the line-scan camera cannot collect images in the ...

AI Technical Summary

Problems solved by technology

The existing line scan camera external synchronization signal card is large in size, inconvenient to install, high in production cost, and usually can only complete the conversion from RS-422 level to LVDS level, resulting in single function and limited practicability

In addition, because the existing line-scan camera external synchronization signal card does not have the function of controlling the image acquisition area of ​​the line-scan camera, the line-scan camera cannot collect images in the specified area, which in turn causes the image quality of the line-scan camera to be poor. poor

Third, the existing line scan camera external synchronization signal card cannot meet the user's requirements for image acquisition with different precision, and the versatility is poor

Usually the external synchronization signal is generated by an encoder, which is a device that generates a corresponding pulse signal every fixed distance interval (or angle), and the pulse signal generated by the encoder is level-converted by the external synchronization signal card of the line array camera. It can be used to input to the external synchronous input terminal of the line array camera. When a pulse occurs each time, the camera collects a row of images. However, in the existing image acquisition system (AOI film inspection machine system) used for the line array camera, due to There are errors in the mechanical motion platform (usually, the above errors are unavoidable), resulting in poor image quality collected by the line-scan camera (camera) in a small area when the motion platform is started, which directly affects the detection of the system performance

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