Image acquisition and processing method based on camera callback function and multi-thread technology

Abstract

The invention discloses an image acquisition and processing method based on a camera callback function and a multi-thread technology. The method comprises the following steps: (1) acquiring image data; (2) opening up a thread pool; (3) synchronizing an image processing result. According to the image acquisition and processing method based on the camera callback function and the multi-thread technology, the situation that the image processing time is far longer than the image acquisition time can be dealt with, the acquired image can be processed in time while frame loss is avoided, and therefore the time sequence requirement of equipment can be better met; the method has certain advantages in batch and continuous detection, that is, the hardware performance can be fully utilized, so that the image acquisition and processing process can better meet the requirement of production takt.

Description

technical field [0001] The invention relates to the technical field of image acquisition and processing. Background technique [0002] 1. Camera callback function: [0003] In the industrial vision system, there are two ways for the control host to obtain real-time image data from the industrial camera through the camera SDK: [0004] 1) By calling the API function Grab() of the camera SDK, the image data is obtained after the set waiting time; [0005] 2) Trigger the camera acquisition through software or hardware, and then obtain the image data through the callback function, such as figure 1 shown. [0006] 2. Industrial machine vision processing system mode: [0007] At present, industrial machine vision acquisition and processing systems generally adopt two methods of "fixed shooting" and "flying shooting", such as figure 2 with image 3 shown. [0008] "Fixed shooting" refers to a motion controller such as a PLC that controls the mechanical axis to move to the c...

AI Technical Summary

Problems solved by technology

This method of asynchronously controlling image acquisition and image processing can improve production efficiency, but due to the short image acquisition time and slightly poor image quality, it is easy to lead to a decrease in accuracy

[0010] Disadvantages or deficiencies of existing technologies: With the resolution of cameras changing from the commonly used 300,000 pixels to millions to tens of millions of pixels, the amount of data and time for image processing has greatly increased, and the possible phenomenon is that the image processing time is too long at image capture time

At this time, for the "fixed shooting" method, due to the lengthening of image processing time, the operating efficiency of the entire system will be further reduced

For the "flying shooting" method, it may be that the image processing cannot be completed in time, and the continuous accumulation of image data in the buffer memory will cause the image processing speed to slow down, making it difficult to meet the timing requirements of "flying shooting".

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