perspective

Is it possible to make perspective image transformation in html5 canvas? I am using EaselJS right now and can't find a solution for my need. I don't tried the easel.js yet, but every image transformation is done with matrix operations: translate, rotate, skew etc. Looking on the easel.js source code there is a Matrix2D class, and the documentation to it: http://www.createjs.com/Docs/EaselJS/Matrix2D.html . For a perspective transformation you need to use rotation , scaling and skewing . You need to only play with values and test which is best suited for your needs. To achieve perspective

I want to know how to use our own perspective as default? it means show the perspective when the eclipse lunched. Can anyone knows how to do this ? You can select perspective with the following command line parameter -perspective perspectiveId See the Eclipse help for more information about command line parameters. 来源： https://stackoverflow.com/questions/13585377/how-to-show-our-own-perspective-as-default

I converted the perspective correction code implemented using OpenCV and C++ at: https://opencv-code.com/tutorials/automatic-perspective-correction-for-quadrilateral-objects/ to obtain the following OpenCV code implemented in Java: public class project { static Point2f center; public static void main(String args[]) { System.loadLibrary(Core.NATIVE_LIBRARY_NAME); center = new Point2f(0,0); Mat src = new Mat(); src = Highgui.imread("image.jpg"); if(src == null) { System.out.println("Image not loaded"); System.exit(1); } Mat bw = new Mat(); Imgproc.cvtColor(src, bw, Imgproc.COLOR_BGR2GRAY);