Image processing device and image processing method for correcting a pixel using a corrected pixel statistical value

An image processing device, comprising:

• a pixel statistical value calculation unit which, for each of regions in a plurality of layers, calculates a pixel statistical value of pixels for the region, the regions containing attention pixels and having ranges that are successively narrower;
• an edge information calculation unit which calculates edge information for each of the regions in the plurality of layers, the regions containing the attention pixels and having the ranges that are successively narrower;
• a correction unit which corrects differential information between a pixel statistical value for a first region and a pixel statistical value for a second region by using the edge information of the second region, wherein the first region is in an attention layer and the second region is in a layer wider than the first region, and corrects the pixel statistical value for the first region by using the corrected differential information and the pixel statistical value for the second region;
• and
• a re-correction unit which re-corrects differential information between the uncorrected pixel statistical value for the first region and the corrected pixel statistical value for the first region by using a pixel statistical value for a third region and the differential information between the uncorrected pixel statistical value for the first region and the corrected pixel statistical value for the first region, wherein the third region is equal to or wider than the first region and the second region,
• wherein correction of the pixel statistical value and re-correction of the corrected pixel statistical value for the first region are repeated sequentially in the respective layers until the first region is reduced from a maximum range to a minimum range.

An image processing device, comprising:

• pixel statistical value calculation means for, for each of regions in a plurality of layers, calculating a pixel statistical value of pixels in the region, the regions containing attention pixels and having ranges that are successively narrower;
• edge information calculation means for calculating edge information for each of the regions in the plurality of layers, the regions containing the attention pixels and having the ranges that are successively narrower;
• correction means for correcting differential information between a pixel statistical value for a first region and a pixel statistical value for a second region by using the edge information of the second region, and correcting the pixel statistical value for the first region by using the corrected differential information and the pixel statistical value for the second region, wherein the first region is in an attention layer and the second region is in a layer wider than the first region;
• and
• re-correction means for re-correcting differential information between the uncorrected pixel statistical value for the first region and the corrected pixel statistical value for the first region by using a pixel statistical value for a third region and the differential information between the uncorrected pixel statistical value for the first region and the corrected pixel statistical value for the first region, wherein the third region is equal to or wider than the first region and the second region,
• wherein correction of the pixel statistical value and re-correction of the corrected pixel statistical value for the first region are repeated sequentially in the respective layers until the first region is reduced from a maximum range to a minimum range.