[Halcon vision] affine transformation

         In image processing , Often need to zoom , translation , rotate , Reflection , Crosscutting . This is affine transformation .

        Affine transformation , It is the superposition of two simple transformations . One is linear transformation , One is translation transformation .

        Properties of affine transformation ：

1. Convexity
2. Collinearity ： If several points are on a straight line before transformation , After affine transformation, it is still on a straight line .
3. Parallelism ： If two lines are parallel before transformation , The transformation is still parallel .
4. Collinear scale invariance ： On a line , The proportion of two line segments , Affine transformation remains unchanged .

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