Embedded image acquisition and processing system and method based on particle image velocimetry

Abstract

The invention discloses an embedded image acquiring and processing system based on particle image velocity measurement and a method thereof. The system comprises a spectroscopic camera and an embedded image acquisition processing module. Two CCD cameras in the spectroscopic camera performs time sharing exposure on an acquired particle image, and furthermore transmit the particle image to an image acquisition processing board. The embedded image acquisition processing module comprises an image preprocessing sub-module and an image acquisition time forecasting sub-module, wherein the image preprocessing sub-module finishes image preprocessing. The image acquisition time forecasting sub-module finishes cross correlation algorithm calculation on particle flow field velocity measurement based on improved cross correlation algorithm based on FFT, and furthermore forecasts a speed field and then calculates an image acquisition time interval, and then transmits the time interval to the spectroscopic camera for realizing controlling to the exposure time interval of the two CCD cameras. The embedded image acquiring and processing system and the method have advantages of improving cross correlation peak value accuracy, improving calculation precision, realizing high performance and high convenience in carrying, and realizing high suitability for particle flow field velocity measurement in various occasions.

Description

technical field [0001] The invention belongs to the field of image acquisition and processing systems, and more specifically relates to an embedded image acquisition and processing system and method based on particle image velocimetry. Background technique [0002] In the study of high-speed flow field, particle image velocimetry, as a test method, has the characteristics of high precision, transient, non-contact, and full-field measurement, and is widely used in the measurement of high-speed flow field. The general particle image velocimetry system is composed of particle generation and projection system, laser lighting system, image acquisition system and particle image processing system. In the particle image processing system, PC is mostly used for image processing algorithms. Due to the fact that the speed of the ultra-high-speed flow field changes with time, the PC is not fast enough to process the flow field image, and cannot realize real-time processing and control, ...

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Problems solved by technology

[0005] Aiming at the above defects or improvement needs of the prior art, the present invention provides an image acquisition and processing system and method, wherein in combination with the characteristics of particle image acquisition, an embedded image acquisition and processing system and method based on particle image velocimetry is designed accordingly, Through the combination of improved algorithm and hardware platform, it improves the accuracy of cross-correlation peak detection, improves the accuracy of flow field velocity measurement, and controls the exposure of the camera through the image acquisition time interval, effectively solving the problem of high-speed unsteady flow field. , the problem of inaccurate speed measurement

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