Video signal processing method and apparatus

A video signal processing apparatus, comprising:

• at least one processor;
• and a memory, coupled to the at least one processor and storing one or more instructions that, when executed by the at least one processor, cause the video signal processing apparatus to:
• perform color space conversion on a to-be-processed video signal to obtain a first non-linear red green blue (RGB) signal;
• convert the first non-linear RGB signal based on an electro-optical transfer function, to obtain a first linear RGB signal;
• perform luminance mapping on the first linear RGB signal to obtain a second linear RGB signal, wherein a luminance value range corresponding to the second linear RGB signal is the same as a luminance value range corresponding to a display device, the performing luminance mapping comprises:
• calculating a temporary luminance value based on each primary color value of the first linear RGB signal;
• converting the temporary luminance value based on a preset luminance mapping curve, to obtain an adjustment coefficient;
• and
• multiplying each primary color value by the adjustment coefficient to obtain the second linear RGB signal;
• convert the second linear RGB signal based on an optical-electro transfer function, to obtain a second non-linear RGB signal;
• perform color space conversion on the second non-linear RGB signal to obtain a first luminance-chrominance signal;
• and
• perform saturation mapping on a chrominance component of the first luminance-chrominance signal to obtain a second luminance-chrominance signal, wherein the performing saturation mapping comprises:
• converting the temporary luminance value based on a preset saturation mapping curve, to obtain a saturation factor;
• and
• multiplying the saturation factor by a chrominance value of the chrominance component, to obtain an adjusted chrominance value.

A non-transitory computer-readable storage medium, wherein the computer-readable storage medium comprises computer-executable instruction, when the instruction is executed by at least one processor, cause an apparatus to:

• perform color space conversion on a to-be-processed video signal to obtain a first non-linear red green blue (RGB) signal;
• convert the first non-linear RGB signal based on an electro-optical transfer function, to obtain a first linear RGB signal;
• perform luminance mapping on the first linear RGB signal to obtain a second linear RGB signal, wherein a luminance value range corresponding to the second linear RGB signal is the same as a luminance value range corresponding to a display device, the performing luminance mapping comprises:
• calculating a temporary luminance value based on each primary color value of the first linear RGB signal;
• converting the temporary luminance value based on a preset luminance mapping curve, to obtain an adjustment coefficient;
• and
• multiplying each primary color value by the adjustment coefficient to obtain the second linear RGB signal;
• convert the second linear RGB signal based on an optical-electro transfer function, to obtain a second non-linear RGB signal;
• perform color space conversion on the second non-linear RGB signal to obtain a first luminance-chrominance signal;
• and
• perform saturation mapping on a chrominance component of the first luminance-chrominance signal to obtain a second luminance-chrominance signal, wherein the performing saturation mapping comprises:
• converting the temporary luminance value based on a preset saturation mapping curve, to obtain a saturation factor;
• and
• multiplying the saturation factor by a chrominance value of the chrominance component, to obtain an adjusted chrominance value.