MATLAB: I want measuring angle in image

binarydigital image processinggaitimageimage acquisitionimage analysisimage processingImage Processing Toolboximage segmentation

I have picture as binary image I want find angle of picture in top left,top right,bottom right,bottom left from axis X at 0 degree whirl as circle completely, 360 degree. red point is point want to know angle in picture

**red point I create in Photoshop

Best Answer

See Roger Stafford's answer: https://www.mathworks.com/matlabcentral/answers/120930-calculate-an-angle-and-distance-from-three-points#answer_127755

and Cleve's blog: http://blogs.mathworks.com/cleve/2016/04/11/the-eigenwalker-model-of-the-human-gait/

Related Solutions

MATLAB: How to draw bounding box around white area in binary image

Use regionprops() to get the bounding box.

I don't know what "angle of image 4 angle" is.

MATLAB: How to find boundaries of scattered pixels in an image

One way to get the "boundary" is to call bwconvhull():

chImage = bwconvhull(binaryImage);

To find the centroid of the blob(s), you can use regionprops():

props = regionprops(chImage, 'Centroid');
% Plot centroids.
hold on;
for k = 1 : length(props)
    plot(props(k).Centroid(1), props(k).Centroid(2), 'r+', 'MarkerSize', 25);
end

To find the centroid of the points (rather than the solid convex hull blob regions), you can use find

[y, x] = find(binaryImage); % Not [x,y] as in the other answer.
xCentroid = mean(x);  % Column.
yCentroid = mean(y);  % Row.

Best Answer

Related Solutions

MATLAB: How to draw bounding box around white area in binary image

MATLAB: How to find boundaries of scattered pixels in an image

Related Question