Method, apparatus, terminal, and storage medium for image processing

A method for image processing, characterized by comprising the steps of:

• acquiring an image generated by an infrared sighting telescope arranged on a firearm;
• determining a gray level dynamic range of a preset first portion of the image, wherein the image is composed of a preset first portion and a preset second portion, the preset first portion and the preset second portion respectively correspond to a half region of the image;
• and the position of the preset first portion relative to the image is the same as the position of the infrared sighting telescope relative to the firearm;
• determining a non-barrel influence region in the preset first portion based on a preset barrel influence region threshold;
• and
• determining a background threshold based on a mean gray level of the non-barrel influence region;
• determining the gray level of each pixel in each row or each column in the preset second portion;
• and
• selecting a mean value of gray levels of pixels closest to the background threshold as a gray level expectation value;
• if a difference value between the gray level dynamic range value and the gray level of the preset second portion reaches a preset starting processing threshold, performing mean filtering processing on each pixel of the preset second portion to obtain a filtered gray level, wherein the preset starting processing threshold is determined by the difference value in gray level between the normal image and the image to be processed;
• and
• if the filtered gray level is greater than a preset gray level expectation threshold, processing the pixel, so that the gray level of the pixel is close to the gray level expectation value, wherein the gray level expectation threshold is a mean value of the smallest gray level of pixels in each row.