Matlab卷积和源代码

一维卷积用conv(A,B,'same')
二维卷积用conv2(A,B,'same')

 CONV Convolution and polynomial multiplication.
    C = CONV(A, B) convolves vectors A and B.  The resulting vector is
    length MAX([LENGTH(A)+LENGTH(B)-1,LENGTH(A),LENGTH(B)]). If A and B are
    vectors of polynomial coefficients, convolving them is equivalent to
    multiplying the two polynomials.
 
    C = CONV(A, B, SHAPE) returns a subsection of the convolution with size
    specified by SHAPE:
      'full'  - (default) returns the full 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. 
                LENGTH(C)is MAX(LENGTH(A)-MAX(0,LENGTH(B)-1),0).
 
    Class support for inputs A,B: 
       float: double, single
 
    
 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) convolves A first with the vector H1 along the
    rows and then with the vector H2 along the columns. If n1 = length(H1)
    and n2 = length(H2), then mc = max([ma+n1-1,ma,n1]) and