Search code examples
opencvimage-processingaffinetransform

Affine transformation of selected area

I want to create a tool for affine transformation on selected part of image(4 corners polygon, see image link). http://s14.postimg.org/fn9btus8h/explanation.png

I tried to use opencv but without success.

Thanks for help. Regards

Solution

  • Thanks everyone for help. I found solution.

    I used Qt functionality. Here is my code:

    QImage img;
img.load("D:\\sample.png");
QPolygonF polygonIn;
polygonIn  << QPointF(29, 25)
    << QPointF(147, 9)
    << QPointF(210, 100)
    << QPointF(0, 84);

QPolygonF polygonOut;   
polygonOut  << QPointF(29, 25)
    << QPointF(147, 25)
    << QPointF(210, 132)
    << QPointF(0, 84);

QTransform transform;
auto isOk = QTransform::quadToQuad(polygonIn, polygonOut, transform);
if(!isOk)
    throw std::runtime_error("Transformation impossible with such parameters.");

img = img.transformed(transform.toAffine(), Qt::TransformationMode::SmoothTransformation);