Image processing method and apparatus

An image processing apparatus, comprising a processor and a transmission interface, wherein

• the transmission interface is configured to receive or send image data;
• and
• the processor is configured to invoke program instructions stored in a memory, and execute the program instructions to cause the image processing apparatus to:
• obtain a target picture and an initial tone mapping curve of the target picture;
• determine a plurality of interpolation points based on luminance information and/or dynamic metadata of the target picture;
• determine a spline function that passes through the plurality of interpolation points, wherein the spline function is smoothly connected to the initial tone mapping curve at at least one of the plurality of interpolation points;
• obtain a modified tone mapping curve of the target picture based on the initial tone mapping curve and the spline function;
• and
• perform tone mapping on the target picture based on the modified tone mapping curve
• wherein the initial tone mapping curve comprises a first endpoint and a second endpoint, the first endpoint and the second endpoint are respectively located at two ends of the initial tone mapping curve, a luminance value corresponding to the first endpoint is less than a luminance value corresponding to the second endpoint, a quantity of dark region pixels comprised in the target picture is greater than or equal to a second preset threshold, luminance values of the dark region pixels are less than a first preset threshold, the plurality of interpolation points comprise a first interpolation point, wherein the processor is further configured to execute the program instructions to cause the image processing apparatus to:
• determine that a first coordinate value of the first interpolation point is the same as a first coordinate value of the first endpoint.

A non-transitory computer-readable storage medium, wherein the non-transitory computer-readable storage medium stores instructions;

• and when the instructions are run on a computer or a processor, the computer or the processor is enabled to:
• obtain a target picture and an initial tone mapping curve of the target picture;
• determine a plurality of interpolation points based on luminance information and/or dynamic metadata of the target picture;
• determine a spline function that passes through the plurality of interpolation points, wherein the spline function is smoothly connected to the initial tone mapping curve at at least one of the plurality of interpolation points;
• obtain a modified tone mapping curve of the target picture based on the initial tone mapping curve and the spline function;
• and
• perform tone mapping on the target picture based on the modified tone mapping curve,
• wherein the initial tone mapping curve comprises a first endpoint and a second endpoint, the first endpoint and the second endpoint are respectively located at two ends of the initial tone mapping curve, a luminance value corresponding to the first endpoint is less than a luminance value corresponding to the second endpoint, a quantity of dark region pixels comprised in the target picture is greater than or equal to a second preset threshold, luminance values of the dark region pixels are less than a first preset threshold, the plurality of interpolation points comprise a first interpolation point, wherein the computer or the processor is further enabled to:
• determine that a first coordinate value of the first interpolation point is the same as a first coordinate value of the first endpoint.