包含BorderSize参数时的Blockproc错误 [英] Blockproc error when including BorderSize argument

问题描述

我正在Matlab在dct https:上进行练习: //www.mathworks.com/help/images/discrete-cosine-transform.html

I'm working on the exercise by Matlab on dct https://www.mathworks.com/help/images/discrete-cosine-transform.html

我运行了以下代码:

I = imread('cameraman.tif'); 
I = im2double(I);
imshow(I)

T = dctmtx(8);
dct = @(block_struct) T * block_struct.data * T';
B = blockproc(I,[8 8],dct,'BorderSize',[4 4],'Trim',false) %modification made here

代码来自上面的链接，但是我包括了"BorderSize"标准，以允许块的重叠.运行代码后，出现错误提示:

The code was from the link above, but i included the 'BorderSize' criteria to allow for overlapping of the blocks. Upon running the code, i get the error saying:

Error using blockprocFunDispatcher
BLOCKPROC encountered an error while evaluating the user-supplied function handle,FUN.

Error in blockprocInMemory
[u1_output fun_nargout] = blockprocFunDispatcher(fun,block_struct,...

Error in blockproc
    result_image = blockprocInMemory(source,fun,options);

什么可能是导致上述错误消息的问题?如果我删除'BorderSize'，[4 4]，'Trim'，false ，它像链接中一样正常工作，但是我使用错误吗?

What could be the issue causing the error message above? If i remove 'BorderSize',[4 4], 'Trim',false it works as normal like in the link but am i using it wrongly?

推荐答案

您是否考虑到以下事实:指定了BorderSize后，在函数dct的定义中您的块大小会更大吗?您的函数将收到一个12x12的块，听起来像矩阵中的大小不匹配乘以T和T'.您是否需要将T的定义更改为:

Are you accounting for the fact that with BorderSize specified, your block size will be bigger in your definition of the function dct? Your function will receive a 12x12 block, sounds to me like a size mismatch in the matrix multiplies with T and T'. Do you need to change the definition of T to:

T = dctmx(12)

?

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