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How to get image from a matrix which contains PIXEL values ?

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chinnurocks
chinnurocks 2016-7-25
评论： chinnurocks 2016-7-25
Hi,
I have an image of 400*400. I applied LBP to this and obtained 400*400 matrix which contains LBP value for each pixel. Now I want to convert this LBP matrix to an image. I was expecting some grey scale image, but instead I am getting with yellow color. Expecting something like this.
function LBP_Im = LBP(Input_Im, R)
% %=======================================================================
% %=======================================================================
% This function computes the LBP transformation of the input image
% Input_Im.
% The parameters of the LBP operator are (P = 8, R),
% where P - the number of sampling points in the region with the radius R.
% Radius R is the input parameter of the function.
% Possible values for R = 1, 2, 3, etc.
% If input image is COLOR, then the grayscale transformation is performed.
% %=======================================================================
% %=======================================================================
Input_Im = imread('akaf.jpg');
R= 1
if size(Input_Im, 3) == 3
Input_Im = rgb2gray(Input_Im);
end;
L = 2*R + 1; %%The size of the LBP label
C = round(L/2);
Input_Im = uint8(Input_Im);
row_max = size(Input_Im,1)-L+1;
col_max = size(Input_Im,2)-L+1;
%%for creating array of image dimensions
LBP_Im = zeros(row_max, col_max);
for i = 1:row_max
for j = 1:col_max
A = Input_Im(i:i+L-1, j:j+L-1);
A = A+1-A(C,C);
A(A>0) = 1;
LBP_Im(i,j) = A(C,L) + A(L,L)*2 + A(L,C)*4 + A(L,1)*8 + A(C,1)*16 + A(1,1)*32 + A(1,C)*64 + A(1,L)*128;
end;
end;
t = image(LBP_Im);
%

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采纳的回答

Image Analyst
Image Analyst 2016-7-25
It looks like some colormap is being applied for some reason. I know imagesc() does that but I didn't think image() did. Anyway, you should use imshow(), then call colormap() just to make sure it's gray scale.
imshow(LBP_Im, []);
colormap(gray(256));
colorbar;

更多回答（1 个）

Thorsten
Thorsten 2016-7-25
I used
Input_Im = imread('peppers.png');
and it worked fine. What do you get with peppers.png?

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