Patent ID: 9153015
Filing Date: 2015-10-06
Classification: G06T,H04N

Abstract:
1. An image processing device comprising: a 3-D noise reduction unit configured to take each pixel in an input image as a pixel to be corrected and smooth the input image in a time direction over a plurality of frames, thereby performing noise reduction of a noise component of the pixel to be corrected, and output a 3-D noise-reduced image; a low contrast area detection unit configured to detect a contrast correlation value of a surrounding area of the pixel to be corrected in the 3-D noise-reduced image; an enhancement coefficient determination unit configured to determine a contrast enhancement coefficient for the pixel to be corrected according to the contrast correlation value detected by the low contrast area detection unit; a local contrast enhancement unit configured to enhance contrast of a local area of the pixel to be corrected in the 3-D noise-reduced image according to the enhancement coefficient determined by the enhancement coefficient determination unit and output a local contrast enhanced image signal; a noise reduction coefficient generation unit configured to generate a noise reduction coefficient that increases as the enhancement coefficient determined by the enhancement coefficient determination unit increases; and a first frame memory that stores the noise reduction coefficients generated in the enhancement coefficient determining unit for the pixels in one frame; wherein the 3-D noise reduction unit controls a degree of the noise reduction for the pixel to be corrected according to the noise reduction coefficients stored in the first frame memory for each pixel one frame before.