Question

以下代码未在matlab中运行。我在matlab中尝试匿名函数。你能告诉我这行中有什么错误：

Inv_Y_Quant = blockproc(BB,[8 8], InvQuant);

，相关代码如下：

clear all
clc

I = imread('cameraman.tif');
% convert it to double
I = im2double(I);
% "Trim by 128"
I = I-128;
% Generate the DCT matrix
T = dctmtx(8);
% Generate Function handler for DCT
MyFun1 = @(block_struct) T * block_struct.data * T';
% BlockProcess the DCT the function for 8 by 8 blocks
B = blockproc(I,[8 8],MyFun1);
% Form the Quantization matrix
Q = [ 16 11 10 16 24 40 51 61
12 12 14 19 26 58 60 55
14 13 16 24 40 57 69 56
14 17 22 29 51 87 80 62
18 22 37 56 68 109 103 77
24 35 55 64 81 104 113 92
49 64 78 87 103 121 120 101
72 92 95 98 112 100 103 99];
% now generate function handler for the quantization
MyFun2 = @(block_struct)block_struct.data ./Q;
% perform the quantization
BB = blockproc(B,[8 8],MyFun2);
InvQuant = @(block_struct)round(block_struct.data.*Q);
Inv_Y_Quant = blockproc(BB,[8 8], InvQuant);
InvDct = @(block_struct)dct_matrix'*block_struct.data*dct_matrix;
Z = blockproc(Inv_Y_Quant, [8 8], InvDct);
Z = Z+128;
figure, imshow(Z)
Z = uint8(Z);
figure, imshow(Z)

%imwrite(Z, 'Mar7.tif');
%b = imread('Mar7.tif');
%imshow(b)

Answer 1

正如您在评论中所写，问题是您尝试在匿名函数dct_matrix中使用数组InvDct。此代码在代码中从不定义。

您是否打算使用矩阵T（init为dctmtx(8)）？

修改
在匿名函数中使用参数时（在本例中为dct_matrix），应在定义匿名函数之前定义这些参数。

MATLAB代码整改

1 个答案: