IMAGE PROCESSING APPARATUS AND IMAGE PROCESSING METHOD

摘要

An input image is divided into images composed of luminance signals of a plurality of bands that make up the Laplacian pyramid, noise suppression is applied to each divided image, and then the divided images are composited by addition. The input image is also divided into images composed of color signals of a plurality of bands that make up the Gaussian pyramid, noise suppression is applied to each divided image, and the divided images are composited at an image-based ratio. By thus compositing the luminance signals and color signals, excellent noise suppression can be realized while alleviating deterioration in the image quality during the compositing.

主权项

1. An image processing apparatus comprising:
a first division circuit that divides an input image into images composed of luminance signals of a plurality of bands that make up a Laplacian pyramid; a plurality of luminance noise suppression circuits that each apply noise suppression to, out of the images divided by the first division circuit, an image composed of luminance signals of a corresponding band; an addition circuit that adds images output from the plurality of luminance noise suppression circuits; a second division circuit that divides the input image into images composed of color signals of a plurality of bands that make up a Gaussian pyramid; a plurality of color noise suppression circuits that each apply noise suppression to, out of the images divided by the second division circuit, an image composed of color signals of a corresponding band; and a compositing circuit that composites images output from the plurality of color noise suppression circuits at a ratio based on the images.