How can I convert Binary image to 2D binary matrix

I convert an image to binary image, but can't convert binary image to binary matrix.

I have the code so far,

[X,map]= imread('E:/8SEM/PROJECT_ALOK_SIR/picture/t1000.jpg');
BW = im2bw(X,map,0.3);
imshow(X,map), figure, %if we don't use figure we can't see the two images
imshow(BW)

[Walter Roberson]

jpeg file format cannot store indexed (pseudocolor) images, so the map will always be empty for a jpg file.

Answer 1

[Image Analyst]

What is the problem, if any? Get rid of map in both statements. Then, does it not display or something? Or does it display all black or all white? If so, you might have chosen the wrong threshold. Try something other than 0.3, or try the graythresh() function.

fullFileName = 'E:/8SEM/PROJECT_ALOK_SIR/picture/t1000.jpg';
if exist(fullFileName, 'file')
  rgbImage = imread(fullFileName);
  binaryImage = im2bw(rgbImage, 0.3);
  subplot(1, 2, 1);
  imshow(rgbImage)
  subplot(1, 2, 2);
  imshow(binaryImage);
else
  errorMessage = sprintf('Image file does not exist:\n%s', fullFileName);
  uiwait(warndlg(errorMessage));
end

Answer 2

[Walter Roberson]

A binary image stored in memory is a binary matrix.

Answer 3

[Shahed]

Thank you very much all of you .............