Infrared focal plane detector blind pixel correction method

Abstract

The invention discloses an infrared focal plane detector blind pixel correction method. The method comprises the following steps: calculating an image pixel I, which serves as a center, and an initial window n*n(n=3) formed by surrounding pixels; calculating a window median M, and judging whether the I-M is larger than a preset threshold value v_thd; if I-M>v_thd fails, judging whether n is larger than a preset threshold value n_thd, and if n >n_thd, judging the point is a non-blind pixel, and turning to a next pixel point; if n >n_thd fails, enlarging the window n*n(n=n+2), and calculating the window median M; if I-M> v_thd, skipping to the next step; enlarging the window n*n(n=n+2), and calculating the window median M1; and judging whether the I-M1 is larger than the v_thd, if not, judging the point is a non-blind pixel, and if so, judging the point is a blind pixel, using M to replace the pixel and turning to the next pixel point. The basic idea is a variable window blind pixel elimination method; and the method, based on characteristics of blind pixels in the practical application, does not need to store the blind pixel information, and can finish correction of all blind pixels without iteration for any qualified detector at any time.

Description

technical field [0001] The invention relates to a blind element correction method, in particular to a blind element correction method for an infrared focal plane detector. Background technique [0002] The uncooled infrared focal plane array is a large area detector. Due to the inconsistency of the semiconductor material used to make the device, mask error, defect, process, etc., the infrared focal plane detector has inevitable non-uniformity and blind elements. If these problems are ignored, the imaging image has a poor signal-to-noise ratio. These blind pixel points appear in the image as their gray value changes slowly, which cannot correctly reflect the change of the scene. For the definition of blind element, it mainly takes the degree of response of the device to black body radiation as a quantitative index. Judging from the current literature, the existing blind pixel detection and compensation algorithms at home and abroad are mainly the blind pixel correction cali...

AI Technical Summary

Problems solved by technology

Judging from the current literature, the existing blind pixel detection and compensation algorithms at home and abroad are mainly the blind pixel correction calibration method. This method calibrates the position information of the blind pixel, and then corrects the blind pixel by the surrounding average value. This method can accurately correct the blind pixel. , the algorithm idea is simple and clear, but for each detector, there are different blind element points, which need to be calibrated, and the detection may also generate new blind elements, and the blind element positions consume storage resources, which is not conducive to mass production and use

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