Image dynamic range compression method and device and computer readable storage medium

Abstract

The invention discloses an image dynamic range compression method and device and a computer readable storage medium. The method comprises the following steps: screening effective pixel points from a to-be-processed original image by utilizing a weighted histogram, and generating straight square statistical information, wherein the weighted histogram is obtained by performing weighted processing onthe gray value of each pixel point in the initial histogram based on detail layer information of the to-be-processed original image, and the initial histogram is obtained by initially compressing thegray value of the to-be-processed original image; determining a first element value for representing the gray scale of the image main body and a second element value for representing the details of the image based on the straight square statistical information, and calculating to obtain an effective gray scale statistical value; determining a gray scale mapping relation between the to-be-processed original image and the target compressed image based on the effective gray scale statistical value, the normalized cumulative probability information of the initial histogram and the brightness gaincoefficient; therefore, related technical defects are overcome, edge information is effectively reserved, gentle area noise is removed, inter-frame imaging continuity is improved, and a picture areais made to always keep a higher contrast ratio.

Description

technical field [0001] The present application relates to the field of image processing and computing, in particular to an image dynamic range compression method, device and computer-readable storage medium. Background technique [0002] As we all know, ordinary display devices usually use 8-bit data visible to the human eye for display, and the image bit width directly collected by image acquisition equipment is usually not 8-bit. For example, an infrared thermal imager still has 14-bit or 16-bit grayscale after A / D conversion data, which requires processing the bit width of the image to the bit width supported by the display device. [0003] Dynamic range compression is to compress high-bit images to low-bit according to certain rules, for example, the image bit width of 14bit can be compressed to 8bit visible to human eyes. The infrared band covers 0.75 μm to 300 μm, which is wider than the visible light band. Even if the current infrared thermal imaging camera is sub-ba...

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Problems solved by technology

[0006] The application provides an image dynamic range compression method, device and computer-readable storage medium, which solves the disadvantages of serious loss of image information, introduction of false information and poor imaging continuity in related technologies, and avoids the grayscale of details in the process of image mapping statistics Deletion, which can effectively preserve edge information, remove noise in flat areas, and improve inter-frame imaging continuity, so that the image area always maintains a stronger contrast

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