im2bw

Parameters

Img

M x N x 3 truecolor image or M x N grayscale intensity image.

Index map

M x N indexed image and its M x 3 colormap.

maxvalue

the maximum value to assume Img can take. (Optional, defaults to 1)

threshold

the threshold level, between 0 to 1 (a ratio, like percentage). Pixels of the image that are higher or equal than the threshold are mapped to 1, while pixels that are strictly lower than the threshold are mapped to zero.

BW

Resultant black and white binary image.

Description

Function im2bw converts RGB images, indexed images and grayscale intensity images to binary, by thresholding.

initial_dir = PWD; chdir (SIPDIR + 'images'); [Img,map] = imread('indian.bmp'); clf imshow(Img, map); bw = im2bw(Img, map,0.5); imshow(bw,2); bw = im2bw(Img, map,0.2); imshow(bw,2); chdir(initial_dir);

Authors

• Ricardo Fabbri <ricardofabbri[at]users.sf.net>

Availability

http://siptoolbox.sf.net

See Also

• im2gray