Method for generating high dynamic range image from low dynamic range image

A method for generating a high dynamic range image from a low dynamic range image, wherein, comprising the following steps:

• 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;
• selecting 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;
• wherein,
• the grey-level adjustment comprises inverse-gamma correction and grey-level value increase;
• the grey-level value of pixels m the saturation areas is greater than a preset high dynamic saturation threshold;
• and
• the grey-level enhancement comprises the following steps:
• generating a smooth enhancement mask;
• generating a grey-level enhancement mask in accordance with the smooth enhancement mask;
• and
• enhancing the grey-level value of the saturation areas in the image after the grey-level adjustment from a range of (THDR, Value1) to a range of (THDR, Value) using the grey-level enhancement mask, so as to obtain a target high dynamic range image,
• wherein, THDR is a high dynamic range saturation threshold, Value1 is a maximum grey-level value in the image after the grey-level adjustment, Value is a maximum grey-level value in the target high dynamic range image.