Infra-red contrast enhancement filter

A system for enhancing contrast for an electro-optical video for live streaming, the system comprising:

• an image processor to:
• receive an image block, wherein:
• the image block is part of an electro-optical frame, the electro-optical frame comprises a plurality of image blocks, the image block is one of the plurality of image blocks, and the electro-optical frame is one of a plurality of electro-optical frames generated from an image sensor to form the electro-optical video;
• compute intensity for the image block, wherein for the image block, the intensity is computed based on a number of pixels therein;
• and determine a distribution of intensity of the number of pixels in the image block, wherein each of the number of pixels has a pixel intensity;
• a quantizer communicably coupled to the image processor to:
• quantize a degree of variation in the intensity for the number of pixels, wherein the degree of variation in the intensity for the number of pixels by calculating a Gini coefficient by
• G
• =
• ∑
• x
• ⁢
• (
• U
• ⁡
• (
• x
• )
• -
• C
• ⁡
• (
• x
• )
• )
• ∑
• x
• ⁢
• U
• ⁡
• (
• x
• )
• ,
• where G is Gini coefficient, U(x) is a uniform distribution function and C(x) is a cumulative distribution function;
• determine an upper threshold and a lower threshold for intensity of the number of pixels based on the degree of variation, wherein the lower threshold is determined by:
• minThd
• =
• totalPixelNumber
• numberOfHistgramBins
• ,
• and the upper threshold is determined by m axThd=(1−giniCoef)*maxHistogramBinCount+giniCoef*minThd, and wherein the upper threshold is a weighted sum of maximum number of pixels in a histogram bin and the lower threshold;
• determining an upper set of the number of pixels outlying the upper threshold;
• determining a lower set of the number of pixels outlying the lower threshold;
• modifying the distribution of pixel intensity by:
• for the upper set, reducing the pixel intensity of each of the pixels to a first predetermined intensity, and for the lower set, increasing the pixel intensity to a second predetermined intensity;
• modifying the degree of variation to determine a uniformity in distribution of intensity for the image block;
• constructing a transform using the uniformity to enhance the contrast of the image block;
• and applying the transform to the plurality of image blocks to enhance the contrast of the plurality of image blocks.