Help needed in Image Rectification.
Narendra Sisodiya <[email protected]>
| Newsgroups | gmane.comp.python.image |
|---|---|
| Message-ID | <[email protected]> |
I want your guidance in following problem. I have a Rectangle with a known height and width. (aspect ration is fixed) It has a plane surface. Something like cardboard. Or Rectangle Drawn on wall. I am now taking image of this rectangle from webcam. After taking image of this rectangle from webcam, rectangle occupy small area on image and that is in a form of quadrilateral inside image. I can calculate the XY location of Rectangle from image , So I have Following Matrix Co-ordinate on image -> Actual real world co-ordinate _______________________________________ X1 Y1 -> 0 , 0 X2 Y2 -> width, 0 X3 Y3 -> 0, height X4 Y4 -> width, height ________________________________________ width and height of rectangle is known because I can measure this real object X1 Y1 to X4 Y4 are 4 co-ordinate of this object in image. Because it is a projective transformation, this will be in a shaped of quadrilateral. Now I want to know a matrix operation or any formula, by which I can convert a given X Y of image into corresponding co-ordinate on rectangle. I think, this is known as homography. seeing on web, i can find complex description and formulas which i am unable to understand. May you give me exact formula for how to do it. Thanks ! -- ┌─────────────────────────┐ │ Narendra Sisodiya │ http://narendrasisodiya.com └─────────────────────────┘ _______________________________________________ Image-SIG maillist - [email protected] http://mail.python.org/mailman/listinfo/image-sig