METHOD FOR PRODUCING HIGH DYNAMIC RANGE IMAGE FROM LOW DYNAMIC RANGE IMAGE

• Main Authors: MENG, Guoqing, TANG, Fengfeng, CAO, Lijun, ZHANG, Yong
• Format: Patent
• Language: English; French; German
• Published: 15.06.2022
• Subjects: ADVERTISING; ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICESUSING STATIC MEANS TO PRESENT VARIABLE INFORMATION; CALCULATING; COMPUTING; COUNTING; CRYPTOGRAPHY; DISPLAY; EDUCATION; ELECTRIC DIGITAL DATA PROCESSING; IMAGE DATA PROCESSING OR GENERATION, IN GENERAL; PHYSICS; SEALS

The present invention provides a method for generating a high dynamic range image from a low dynamic range image, including performing grey-level adjustment on a low dynamic range image to be processed in accordance with a preset mapping relationship to obtain an image after the grey-level adjustment, the grey-level adjustment includes anti-gamma correction and grey-level value increase; confirming a plurality of saturation areas in the image after the grey-level adjustment; performing grey-level enhancement of the saturation areas in the image after the grey-level adjustment, to obtain a target high dynamic range image; and outputting the target high dynamic range image. The present invention provides a technical solution for generating a high dynamic range image, wherein it is able to display a corrected image directly by correcting grey-level values of the image through anti-gamma correction; brightness of the image can be improved, and a blocking phenomenon of the image during anti-gamma mapping can be ameliorated by contrast stretch; and smooth enhancement of the saturation area with a grey-level value greater than a preset saturation threshold results in enhancement of the saturation area of the image, thereby improving image display quality and reducing image information loss.