Local tone mapping for hdr video

A device, comprising:

• a memory;
• and
• image processing circuitry coupled to the memory, wherein the image processing circuitry, in operation:
• divides a first image of a succession of images into a plurality of sub-blocks of pixels;
• generates a first mini-image comprising pixels, each pixel of the first mini-image representing a corresponding sub-block of the first image, an intensity of each pixel of the first mini-image being representative of an intensity of the pixels of the corresponding sub-block;
• stores the first mini-image;
• and
• applies tone mapping to a second image of the succession of images based on the first mini-image, generating an output image.

A system, comprising:

• a display, which, in operation, displays images;
• and
• image processing circuitry coupled to the display, wherein the image processing circuitry, in operation:
• divides a first image of a succession of images into a plurality of sub-blocks of pixels;
• generates a first mini-image comprising pixels, each pixel of the first mini-image representing a corresponding sub-block of the first image, an intensity of each pixel of the first mini-image being representative of an intensity of the pixels of the corresponding sub-block;
• stores the first mini-image;
• and
• applies tone mapping to a second image of the succession of images based on the first mini-image, generating an output image.

A non-transitory computer-readable medium having contents which cause image processing circuitry to perform a tone mapping method, the tone mapping method comprising:

• dividing a first image of a succession of images into a plurality of sub-blocks of pixels;
• generating a first mini-image comprising pixels, each pixel of the first mini-image representing a corresponding sub-block of the first image, an intensity of each pixel of the first mini-image being representative of an intensity of the pixels of the corresponding sub-block;
• storing, the first mini-image in a memory;
• and
• modifying a second image of the succession of images based on the first mini-image, generating an output image.