Looking to identify a football from an image

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Michael Sposato
Michael Sposato 2022-9-29
回答： Image Analyst 2025-10-3，14:27
I currently have a still image of a football about to be kicked. I would like to identify the ball and it's center.

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回答（3 个）

Kevin Holly
Kevin Holly 2022-9-30
Ran in:
RGB = imread('YourImage.png');
% Convert RGB image to lab space
I = rgb2lab(RGB);
% Apply thresholds
BW = (I(:,:,1) >= 14.5 ) & (I(:,:,1) <= 89.77) & ...
(I(:,:,2) >= 0.12) & (I(:,:,2) <= 12.5) & ...
(I(:,:,3) >= 3.8) & (I(:,:,3) <= 33.0);
% Open mask
se = strel('disk', 13,0);
BW = imopen(BW, se);
% Filter out smaller objects
BW=bwareafilt(BW,[50000 Inf]);
% Find Centroid and Area of object
rp = regionprops(BW,"Centroid","Area")
rp = struct with fields:
Area: 58864 Centroid: [644.7752 215.7900]
% Display masked image for verfication purposes
maskedRGBImage = RGB;
maskedRGBImage(repmat(~BW,[1 1 3])) = 0;
imshow(maskedRGBImage)
% Add marker on centroid
hold on
scatter(rp.Centroid(1),rp.Centroid(2),'b','filled')
  1 个评论
Michael Sposato
Michael Sposato 2022-10-5
I also need this to work for other images as well. What is there to change to do this? I attached another sample image as well.
Also how is the centroid calculated? Is it by the extremes or by matlab calculating the area of the ellipse?

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carol
carol 2025-10-2，18:04
移动：Image Analyst 2025-10-3，14:26
From a still image, sometimes you can spot the brand and model by the pattern and logo on the ball. If the center is tricky, using image editing software to mark the exact midpoint can help. Have you tried zooming in or enhancing the contrast to see details more clearly? It might make identifying the exact type of ball easier
Image Analyst
Image Analyst 2025-10-3，14:27
You can use transfer learning to identify footballs in a variety of images with a variety of colors, orientations, sizes, etc. See this answer:
https://www.mathworks.com/matlabcentral/answers/508234-can-the-googlenet-on-transfer-learning-in-10-lines-of-matlab-code#answer_418228

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