How can I measure an angle between center and pixel?
7 次查看(过去 30 天)
显示 更早的评论
Hi, im doing a little detection project but Ive stumbled upon some issues I cant quite figure out.
My program detects wanted circle and marks the center but 1. the Y-axis values increase from top to bottom and 2. I tried measuring an angle between the X-axis and the found center using 'atan2d' but I can't make it work like I need to.
In the image I drew in blue lines how the angle is detected right now and in red and green how I need it to be detected from the center point of the screen.
I'd be thankfull for any advice on the matter.
![](https://www.mathworks.com/matlabcentral/answers/uploaded_files/723834/image.jpeg)
0 个评论
采纳的回答
Image Analyst
2021-8-28
Find the centroid of the blob and the image, get delta y and delta x, and use arctand(). Something like
mask = bwareafilt(mask, 1); % Take largest blob only.
[rows, columns] = size(mask);
xci = columns/2; % Image centroid.
yci = rows/2;
props = regionprops(mask, 'Centroid');
xbi = props.Centroid(1); % Blob centroid.
ybi = props.Centroid(2);
angle = atan2d(ybi-yci, xbi-xci)
Adapt as needed.
0 个评论
更多回答(0 个)
另请参阅
类别
在 Help Center 和 File Exchange 中查找有关 Image Processing Toolbox 的更多信息
Community Treasure Hunt
Find the treasures in MATLAB Central and discover how the community can help you!
Start Hunting!