how to convert 8x8 matrix into image?

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Abhinaya Rajasekaran 2015-1-21

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编辑： Mohammad Abouali 2015-1-23

i am doing project in dct...i hav taken an image converted it into 8x8 matrix...and compressed it using dct...now i want to convert the dct 8x8 matrix output back to image...pls help me in writing the code.

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Mohammad Abouali 2015-1-21

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编辑：Mohammad Abouali 2015-1-21

do the inverse dct or idct().

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Mohammad Abouali 2015-1-22

编辑：Mohammad Abouali 2015-1-22

在 MATLAB Online 中打开

Well, those are just a sample 8x8 tile of an image. That's only to for the example. Try this:

Original = ...
  [154 123 123 123 123 123 123 136;
   192 180 136 154 154 154 136 110;
   254 198 154 154 180 154 123 123;
   239 180 136 180 180 166 123 123;
   180 154 136 167 166 149 136 136;
   128 136 123 136 154 180 198 154;
   123 105 110 149 136 136 180 166;
   110 136 123 123 123 136 154 136];
Decompressed = ...
  [149 134 119 116 121 126 127 128;
   204 168 140 144 155 150 135 125;
   253 195 155 166 183 165 131 111;
   245 185 148 166 184 160 124 107;
   188 149 132 155 172 159 141 136;
   132 123 125 143 160 166 168 171;
   109 119 126 128 139 158 168 166;
   111 127 127 114 118 141 147 135];
% These would be very small too see
figure, imshow(Original,[]);
figure, imshow(Decompressed,[]);
% to make it larger so easier to see
figure, imshow(imresize(Original,50,'nearest'),[])
figure, imshow(imresize(Decompressed,50,'nearest'),[])

You should get this for Original:

and this for the decompressed:

and Yes, they just look like some gray dots and white dots. Not so interesting. But that's only to show an example.

Image Analyst 2015-1-23

You can also set the 'InitialMagnification' parameter in imshow to something like 800 or 1600 to show it larger, instead of calling imresize.

Mohammad Abouali 2015-1-23

编辑：Mohammad Abouali 2015-1-23

Actually didn't know about that. That's very useful to know. Thank you.

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Abhinaya Rajasekaran 2015-1-22

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I got the point that image is matrix of numbers...but i hav to show the image as output..not the matrix....how to display the matrix as image in matlab??