Image processing method for background suppression

Abstract

The invention belongs to the technical field of image processing, in particular to an image processing method for background suppression, aiming at reducing background interference of image signal andsolving the problem of low signal-to-noise ratio of HTV image under complex flow field. The technical proposal of the invention is as follows: firstly, the method removes the OH fluorescence background interference of the digital image collected at the current sampling time through an adaptive difference method by using a spatial transformation module; secondly, the spatial transform module is called to remove the background noise of the current digital image LD by adaptive spatial filtering. Finally, the frequency domain transform module is called to remove the background noise of the current digital image LS by wavelet filtering. The image preprocessing ability of HTV velocity measurement in high temperature and high speed flow field is effectively improved, the background interferenceof image signal is reduced, and the image signal-to-noise ratio is improved.

Description

technical field [0001] The invention belongs to the technical field of image processing, and in particular relates to an image processing method for background suppression. Background technique [0002] In the research of various high-speed flows and the research of engines and other power devices involving various types of flow phenomena, the velocity of the flow field is a very important parameter, which has great significance for the study of flow field structure, numerical calculation model verification, engine design evaluation, etc. Very important. On-line high-precision measurement of flow field velocity has become one of the focuses and hotspots of related research. At present, methods for on-line measurement of flow field velocity include particle velocity imaging (abbreviated: PIV) method and molecular marker trace velocity measurement (abbreviated: MTV) method, etc. Among them, PIV technology needs to sow tracer particles in the flow field, which will pollute th...

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to reduce the background interference of image signals, solve the problem of low signal-to-noise ratio of HTV images in complex flow fields, and propose a background suppression image processing method based on the combination of space, space domain transformation and frequency domain transformation

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