roicolor (Image Processing Toolbox User's Guide)

Image Processing Toolbox User's Guide

Select region of interest, based on color

Syntax

BW = roicolor(A,low,high)
BW = roicolor(A,v)

Description

roicolor selects a region of interest within an indexed or intensity image and returns a binary image. (You can use the returned image as a mask for masked filtering using roifilt2.)

BW = roicolor(A,low,high) returns a region of interest selected as those pixels that lie within the colormap range [low high].

```
BW = (A >= low) & (A <= high)
```

BW is a binary image with 0's outside the region of interest and 1's inside.

BW = roicolor(A,v) returns a region of interest selected as those pixels in A that match the values in vector v. BW is a binary image with 1's where the values of A match the values of v.

Class Support

The input image A must be numeric. The output image BW is of class logical.

Example

I = imread('rice.png'); 
BW = roicolor(I,128,255);
imshow(I);
figure, imshow(BW)

See Also

roifilt2, roipoly

rgbplot roifill