In the practical application of speckle pattern interference, it is often necessary to measure the deformation or defects of some specimens placed in the box. Transparent glass observation windows are usually used on one side of these boxes. In the measurement of laser speckle pattern interference, glass windows often cause overexposure in a certain area of the field of view, which has a great influence on the measurement. In this paper, a method of recognizing and eliminating high reflective region based on polaroid is proposed. By adjusting the polaroid to filter the stray and chaotic obtrusive light, the overexposed area in the field of view is greatly reduced, and then the exposure area caused by glass windows in the field of view is identified and extracted by feature extraction technology. Finally, the overexposed area is interpolated and filled according to the surrounding region information to obtain the measurement map without overexposure. Experimental results show that the proposed method can effectively extract and eliminate the overexposed area, and good measurement results are obtained.
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