Shulou(Shulou.com)06/03 Report--

Infrared image processing is generally different from the ordinary visible light infrared processing algorithm, although the type and process are similar, but the specific time is different.

The infrared image is generally uniform due to the fabrication process of the imaging chip, which means that the same input produces different output. In the case of zero input, the dark current is different, the phenomenon in cmos visible light will be better, visible light can generally be eliminated by single-point correction, but the infrared image needs two-point correction with single-point correction. This is also because the general infrared movement has a shield, while today's high-end movements do not have a shield, so such a movement may be a large-capacity memory device that stores background images of several temperature points, and then piecewise linearly finds the dark current value of a temperature point. The basic algorithm is the average calculation of correction parameters for the whole range of two-point temperature calibration, and the advanced points are multi-point calibration and some scene-based correction algorithms which can not be applied yet.

Generally speaking, blind spot removal has basically disappeared in visible light chips, because the general technological level of visible image chips has been relatively perfect. in fact, the existence of blind spot removal of infrared chips is also due to our country's reasons. Infrared imaging chips are used in weapons to do recognition, × × terminal guidance applications, so it is limited, so the chips we get are some Class B or C goods. The blind pixel ratio of such a chip will be 1500.300000, so blind pixel compensation will exist in the infrared chip.

Histogram stretching is basically gone in visible light, but it is not because of technological problems in infrared, but mainly because of the characteristics of infrared imaging, and its grayscale varies between dozens of them. In this way, it is necessary to stretch these dozens of grayscale to the whole display range, and the basic algorithm is a linear stretch. The algorithm of advanced points is segmented stretching, region stretching based on edge detection and so on.

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