How can I transform points (pixel points) of the same different size images ?

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K M Ibrahim Khalilullah 2018-1-20

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https://ww2.mathworks.cn/matlabcentral/answers/378108-how-can-i-transform-points-pixel-points-of-the-same-different-size-images

评论： Image Analyst 2018-1-21

I have attached an figure, here we see two images A and B, but they are different size. I have the points of a rectangle (e.g., for image B). How can I transform the points

from B to A?

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采纳的回答

Image Analyst 2018-1-20

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此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/378108-how-can-i-transform-points-pixel-points-of-the-same-different-size-images#answer_301004

在 MATLAB Online 中打开

Just multiply the row index of the points by the ratio of the row sizes, and the column index by the ratio of the column sizes.

[rowsa, columnsa, numColorsa] = size(imageA);
[rowsb, columnsb, numColorsa] = size(imageB);
% Transform point 1
row1b = round(row1a * rowsb / rowsa);
col1b = round(col1a * columnsb / columnsb);

Same for any other points, like the other 3 vertex points.