公开(公告)号：US20150016745A1

公开(公告)日：2015-01-15

申请号：US14504171

申请日：2014-10-01

Applicant: QUALCOMM TECHNOLOGIES, INC.

Inventor： Christophe BERNARD ,  Sarah LANNES

IPC: G06T5/00

CPC classification number: G06T5/002 ,  G06T7/0002 ,  G06T2207/10024 ,  G06T2207/20016 ,  G06T2207/20021 ,  G06T2207/20064 ,  G06T2207/20182 ,  G06T2207/30168

Abstract: The present invention relates to a method for determining noise levels in a subband of an image. The method comprises receiving the subband of the image, defining block regions in the at least two space domains of the subband, for each defined block region, identifying first wavelet coefficients associated with coordinate values in the at least two space domains in the defined block region, computing a correlation matrix between identified wavelet coefficients to determine the correlation between first wavelet coefficients according to the at least one color domain, computing second wavelet coefficients, the computation of second wavelet coefficients being based on the correlation matrix and the first wavelet coefficients, computing at least one noise level, the noise level computation being based on at least one second wavelet coefficient and providing the at least one noise level.

Abstract translation: 本发明涉及一种用于确定图像子带中噪声电平的方法。 该方法包括接收图像的子带，为每个定义的块区域定义子带的至少两个空间域中的块区域，识别与定义块区域中的至少两个空间域中的坐标值相关联的第一小波系数 计算识别的小波系数之间的相关矩阵，以确定根据至少一个色域的第一小波系数之间的相关性，计算第二小波系数，基于相关矩阵的第二小波系数的计算和第一小波系数，计算 至少一个噪声电平，所述噪声电平计算基于至少一个第二小波系数并提供所述至少一个噪声电平。