Dynamic range mapping method and apparatus

A dynamic range mapping apparatus, comprising:

• at least one processor;
• and
• at least one memory coupled to the at least one processor and storing instructions, which when executed by the at least one processor, cause the at least one processor to:
• obtain a display parameter of a terminal device,
• obtain feature information of image data;
• and
• obtain a first parameter of a first tone mapping curve of the image data;
• when a preset condition is met, obtain a second parameter of a second tone mapping curve based on the first parameter, the display parameter of the terminal device, and the feature information of the image data, wherein output luminance at a first point on the second tone mapping curve is not greater than input luminance at the first point on the second tone mapping curve;
• and
• perform dynamic range mapping on the image data based on the second parameter of the second tone mapping curve.

A computer-readable storage medium, comprising a computer program, wherein when executed on a computer or by a processor, cause the computer or the processor to perform following steps-operations:

• obtaining a display parameter of a terminal device;
• obtaining feature information of image data;
• obtaining a first parameter of a first tone mapping curve of the image data;
• when a preset condition is met, obtaining a second parameter of a second tone mapping curve based on the first parameter, the display parameter of the terminal device, and the feature information of the image data, wherein output luminance at a first point on the second tone mapping curve is not greater than input luminance at the first point on the second tone mapping curve;
• and
• performing dynamic range mapping on the image data based on the second parameter of the second tone mapping curve.