Patent ID: 9185376
Filing Date: 2015-11-10
Classification: G06T,H04N

Abstract:
1. A noise reduction apparatus of an image signal processor, the apparatus comprising: a processor to control one or more processor-executable units; a reference image creator unit to create a reference image based on chrominance about a plurality of channels included in an output image obtained from an image sensor of a camera; and a noise reduction unit to perform noise reduction for each channel of the plurality of channels using the created reference image, wherein the plurality of channels comprises at least one of a green channel, a red channel, and a blue channel, wherein the reference image creator unit performs noise reduction with respect to the green channel, and creates the reference image using the noise-reduced green channel, the red channel, and the blue channel, wherein the noise reduction apparatus further comprises performing bilateral filtering with respect to at least one of the red channel and the blue channel included in the output image, wherein, in the bilateral filtering, when a difference value between a center pixel and an in-window pixel is greater than a first threshold, and when a difference value between a pixel corresponding to the center pixel and a pixel corresponding to the in-window pixel in the reference image is less than a second threshold, the noise reduction unit performs the noise reduction with respect to at least one of the red channel and the blue channel.