Image processing method and image processing device

An image processing device comprising:

• a pixel statistical value calculation unit calculating a pixel statistical value of pixels for each of areas of a multi-layer, the areas each containing a target pixel and having a successively decreased range;
• an edge information calculation unit calculating edge information for each of the areas of the multi-layer, the areas each containing a target pixel and having a successively decreased range;
• and
• a correction unit correcting difference information between a pixel statistical value of an area of a specific layer and a pixel statistical value of an area of a layer that is wider than the area of the specific layer using the edge information, correcting the pixel statistical value of the area of the specific layer using post-correction difference information, the pixel statistical value of the area that is wider than the area of the specific layer, and a pixel statistical value of an area that is wider than the areas of other layers, and correcting the target pixel by repeating correction and recorrection of the pixel statistical value of the area of the specific layer sequentially in each layer until the area reduces its range from the maximum range to the minimum range.

A non-transitory computer readable storage medium storing a program causing a computer to execute:

• pixel statistical value calculation processing for calculating a pixel statistical value of pixels for each of areas of a multi-layer, the areas each containing a target pixel and having a successively decreased range;
• edge information calculation processing for calculating edge information for each of the areas of the multi-layer, the areas each containing a target pixel and having a successively decreased range;
• and
• correction processing for correcting difference information between a pixel statistical value of an area of a specific layer and a pixel statistical value of an area of a layer that is wider than the area of the specific layer, correcting the pixel statistical value of the area of the specific layer using post-correction difference information, the pixel statistical value of the area that is wider than the area of the specific layer, and a pixel statistical value of an area that is wider than areas of other layers, and correcting the target pixel by repeating correction and recorrection of the pixel statistical value of the area of the specific layer successively in each layer until the area reduces its range from the maximum range to the minimum range.