imabsdif imadd imcomplement imdivide imlincomb

immultiply imsubtract

Image Arithmetic

Adding ImagesI = imread(rice.tif);J = imread(cameraman.tif);K = imadd(I, J);imshow(K)

Brighten an image results saturationRGB = imread(flowers.tif);RGB2 = imadd(RGB, 50);subplot(1, 2, 1); imshow(RGB);subplot(1, 2, 2); imshow(RGB2);

Adding Images (cont.)

Adding Images (cont.)

Subtracting Images Background of a scene

rice = imread(rice.tif);background = imopen(rice, strel(disk, 15));rice2 = imsubtract(rice, background);imshow(rice), figure, imshow(rice2);

Negative valuesimabsdif

Subtracting Images (cont.)

Multiplying Images Scaling: multiply by a constant

(brightens >1, darkens

Multiplying Images (cont.)

I = imread(rice.tif);background = imopen(I, strel(disk, 15));Ip = imdivide(I, background);imshow(Ip, [])

Linear combination only truncates the final result

K = imlincomb(.5, I, .5, I2);

Dividing Images (Ratioing)

Dividing Images (cont.)

THANK YOU

Image ArithmeticAdding ImagesAdding Images (cont.)Adding Images (cont.)Subtracting ImagesSubtracting Images (cont.)Multiplying ImagesMultiplying Images (cont.)Dividing Images (Ratioing)Dividing Images (cont.)Slide 11