An example of musical composition.

An example of a musical composition befor rectification.

The image after turning by the necessary angle

The algorithm of rectification.

X = x*cosT - y*sinT;
Y= x*sinT + y*cosT.

where:

(X, Y) - previous pixel coordinates;
(x, y) - pixel coordinates after rectification by the necessary angle;
T (or Theta on the picture) - the necessary angle.

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