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matlab中的conv2是用于对二维数据进行卷积运算,有三个参数可供选择,下面是help content of conv2 conv2 Two dimensional convolution. C = conv2(A, B) performs the 2-D convolution of matrices A and B.If [ma,na] = size(A), [mb,nb] = size(B), and [mc,nc] = size(C), then mc = max([ma+mb-1,ma,mb]) and nc = max([na+nb-1,na,nb]). C = conv2(H1, H2, A) first convolves each column of A with the vector H1 and then convolves each row of the result with the vector H2. If n1 = length(H1), n2 = length(H2), and [mc,nc] = size(C) then mc = max([ma+n1-1,ma,n1]) and nc = max([na+n2-1,na,n2]). conv2(H1, H2, A) is equivalent to conv2(H1(:)*H2(:).', A) up to round-off. C = conv2(..., SHAPE) returns a subsection of the 2-D convolution with size specified by SHAPE: 'full' - (default) returns the full 2-D convolution, 'same' - returns the central part of the convolution that is the same size as A. 'valid' - returns only those parts of the convolution that are computed without the zero-padded edges. size(C) = max([ma-max(0,mb-1),na-max(0,nb-1)],0).
关于full, same以及valid三种参数的区别,如下面的实例所示:
full
same
valid
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