| Input Image
| Operations
| Output Image
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| The RGB Version.
| Converted to JPEG using imgworks on SGI.
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| Converted form RGB to grayscale, and cropped so that it only shows
my head.
[rr gg bb] = tiffread('face.tif');
ii = rgb2gray(rr, gg, bb);
ii = imcrop(ii);
imwrite(ii, 'face1.tif', 'tif');
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| This is the grayscale image after applying the Hsv colormap,
using the Colormap function. Sort of what I would look like after
a nuclear explosion.
ii = imread('face1.tif');
imshow(ii);
colormap(hsv(256));
imwrite(ii, hsv(256), 'face2.tif', 'tif');
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| This is the grayscale image after applying the Hot colormap,
using the Colormap function. Similar to how I might feel on a
hot day...
ii = imread('face1.tif');
imshow(ii);
colormap(hot(256));
imwrite(ii, hot(256), 'face2.tif', 'tif');
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| This is an application of a Prewitt horizonal
edge-emphasising filter. You have to scale back to a
zero-to-one range after the filter.
ii = imread('face1.tif', 'tif');
hh = fspecial('prewitt');
i2 = filter2(hh, ii)/255;
i3 = i2 - min(min(i2)); %% Move the min to 0.
i3 = i3 / max(max(i3)); %% Scale from 0 to 1.
imwrite(i3, 'face4.tif', 'tif');
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| This is an application of a two-dimensional Laplacian
operator. It does edge detection, but seems to wash everything out.
ii = imread('face1.tif', 'tif');
hh = fspecial('prewitt');
i2 = filter2(hh, ii)/255;
i3 = i2 - min(min(i2)); %% Move the min to 0.
i3 = i3 / max(max(i3)); %% Scale from 0 to 1.
imwrite(i3, 'face5.tif', 'tif');
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| This uses the Average filter to blur out the picture.
Note that I used a 7x7 filter, since a 3x3 doesn't do much.
ii = imread('face1.tif', 'tif');
hh = fspecial('average', 7);
i2 = filter2(hh, ii)/255;
i3 = i2 - min(min(i2)); %% Move the min to 0.
i3 = i3 / max(max(i3)); %% Scale from 0 to 1.
imwrite(i3, 'face6.tif', 'tif');
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| Here, I used the RoiPoly function to select out my
face from the rest of the background. Then, I multiplied this
times the original picture, to cut out the background. We have
to convert to "double" since the multiplication doesn't work
on integer arrays.
ii = imread('face1.tif', 'tif');
rr = roipoly;
ii = double(ii);
rr = double(rr);
i2 = ii .* rr;
imwrite(i2, 'face7.tif', 'tif');
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