CODEWITHSUNDEEP
iosmathopencvgeometry
Mujtaba Alboori
Mujtaba Alboori

Reputation: 395

locating the position of points in imageView to larger image

I'm working on app that needs user interaction to locate some points in image. because the image apear smaller in the app , I need to transform the points locations to a larger image. so I need the math to do so. to transform points to a larger image.

Upvotes: 0

Views: 167

Answers (1)

Rok Jarc
Rok Jarc

Reputation: 18875

smaller image dimensions: Ws x Hs bigger image dimensions: Wb x Hb

user taps smaller image at (Xs,Ys)

appropriate point on the bigger image (Xb,Yb) would be:

Xb = Xs * (Wb/Ws);
Yb = Ys * (Hb/Hs);

And for the other way around:

Xs = Xb / (Wb/Ws);
Ys = Yb / (Hb/Hs);

Upvotes: 2

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