- Select matrix and copy
- In MATLAB, paste into variable ("a" in the example below):
First type
>> a= [
then paste (Ctrl^V)
then close bracket, and Enter ]
- Create the image
>> figure
>> imshow (a)
(or on the same line)
>> figure, imshow(a)
- Zoom in to see
Color
If the image is intensities, imshow displays a grayscale image. To display in another color,
1) convert to index
2) imshow with colormap
Converting to index just means convert to numbers into the colormap.
>> num_colorsinmap = 256;
>> a_indexed = round( a * 255 );
- Works for values between 0 and 1; scales 0 to bottom of coloramp, and 1 to top
>> cmap = hot( num_colorsinmap );- For other colormap options, hype >> help colormap
- Examples include hot, hsv, jet, and with CSPM you get jettop, jetbot
>> figure, imshow(a_indexed, cmap)
You could also do this in one line:
>> figure, imshow( round(a*255), hot(256) )
Increase resolution (smooth)
Use the interp2 function to resample at a factor of the original resolution.
>> res_factor = 4;
>> a_res = interp2( a, res_factor );
>> a_res_indexed = round( a_res * 255 );
>> figure, imshow(a_res_indexed, cmap)
Example script
Use the following MATLAB script to create figures. Load the data into "a" first.
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