Image processing method and image processing device with correction of pixel statistical values to reduce random noise

摘要

The present invention is a method including: correcting difference between a pixel statistical value of a specific layer and a pixel statistical value of a layer that is wider than the specific layer using an edge information of a layer that is wider than the specific layer; correcting the pixel statistical value of the specific layer using post-correction difference and the pixel statistical value of layer that is wider than the specific layer; recorrecting the post-correction pixel statistical value of the specific layer using difference between a pre-correction pixel statistical value of the specific layer and the post-correction pixel statistical value of the specific layer and the edge information of a layer that is wider than the specific layer; and correcting the target pixel by repeating correction and recorrection until the layer reduces its range from the maximum range to the minimum range.

主权项

1. An image processing method comprising:
calculating a pixel statistical value and edge information of pixels for each of areas of a multi-layer, the areas each containing a target pixel and having a successively decreased range; correcting difference information between the pixel statistical value of an area of a specific layer and the pixel statistical value of an area of a layer that is wider than the area of the specific layer using the edge information of the area of the 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 and the pixel statistical value of the area of the layer that is wider than the area of the specific layer; recorrecting the post-correction pixel statistical value of the area of the specific layer using difference information between a pre-correction pixel statistical value of the area of the specific layer and the post-correction pixel statistical value of the area of the specific layer and the edge information of the area of the layer that is wider than the area of the specific layer; 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.