MATLAB: Find a White area in image (face)

image processingImage Processing Toolboximage segmentation

Hi, I need to draw a rectangle on my face using white pixels.

Best Answer

To draw a rectangle, you can use rectangle(), plot(), line(), rbbox(), or imrect() depending on what you mean by "draw a rectangle".

You might also be interested in bwareafilt() to extract blobs of certain areas (like only the largest blob), and imfill() to fill in black islands in the white blobs.

Related Solutions

MATLAB: Centroid of an image

Hi,

did you mean 'find centroid of objects in an image'??

use regionprops with property : centroid

Eg : stat = regionprops(Ilabel,'centroid');

I = imread('coins.png');
Ibw = im2bw(I);
Ibw = imfill(Ibw,'holes');
Ilabel = bwlabel(Ibw);
stat = regionprops(Ilabel,'centroid');
imshow(I); hold on;
for x = 1: numel(stat)
    plot(stat(x).Centroid(1),stat(x).Centroid(2),'ro');
end

MATLAB: Bounding Box largest rectangle

stats is a structure array. Each element is a structure and has it's own bounding box. So stats(1).BoundingBox is the bounding box (x,y,width,height) of the first blob. And stats(2).BoundingBox is the bounding box (x,y,width,height) of the second blob, and so on. To display them all:

hold on;
for k = 1 : length(stats) % Loop through all blobs.
  % Find the bounding box of each blob.
  thisBlobsBoundingBox = stats(k).BoundingBox;  
  rectangle('Position', thisBlobsBoundingBox);
end

Best Answer

Related Solutions

MATLAB: Centroid of an image

MATLAB: Bounding Box largest rectangle

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