affinetransform

问题 I have two images, one is the result of applying an affine transform to the other. I can register them using homography by extracting the points using the ORB_create function in OpenCV. However, I want to calculate the Affine matrix needed for this transformation. is there any way of doing it simply by having the two images? 回答1: Detect a rotated rectangle and use its corners to get your transformation matrix Use : getPerspectiveTransform or getAffineTransform Edit: regarding rotated

问题 ( Why am I doing this? See explanation below ) Consider two sets of points, A and B as shown below It might not look like it, but set A is "hidden" within set B . It can not be easily seen because points in B are scaled, rotated, and translated in (x, y) with respect to A . Even worse, some points that are present in A are missing in B , and B contains many points that are not in A . I need to find the appropriate scaling, rotation, and translation that must be applied to the B set in order

问题 ( Why am I doing this? See explanation below ) Consider two sets of points, A and B as shown below It might not look like it, but set A is "hidden" within set B . It can not be easily seen because points in B are scaled, rotated, and translated in (x, y) with respect to A . Even worse, some points that are present in A are missing in B , and B contains many points that are not in A . I need to find the appropriate scaling, rotation, and translation that must be applied to the B set in order

问题 ( Why am I doing this? See explanation below ) Consider two sets of points, A and B as shown below It might not look like it, but set A is "hidden" within set B . It can not be easily seen because points in B are scaled, rotated, and translated in (x, y) with respect to A . Even worse, some points that are present in A are missing in B , and B contains many points that are not in A . I need to find the appropriate scaling, rotation, and translation that must be applied to the B set in order

来源： https://stackoverflow.com/questions/64591629/rotate-a-matrix-with-matplotlib

来源： https://stackoverflow.com/questions/25904516/given-a-set-of-points-how-to-calculate-similarity-transformtranslation-scale-r

来源： https://stackoverflow.com/questions/25904516/given-a-set-of-points-how-to-calculate-similarity-transformtranslation-scale-r

问题 I'd like to control the slantiness (italic) of a text according a given degree and direction (left or right tilt) similar as presented in the image below: I have stumble upon this great answer: How does perspective transformation work in PIL?, played with the code, and read the documentation of AFFINE but it's still isn't clear enough for me. Can someone please explain me (mathematic and logic wise), how can I do this? Thank you. 回答1: To generate some text we can use any method, here I am

问题 I have a set of two dimensions points. Their X and Y are greater than -2 and lesser than 2. Such point could be : (-0.00012 ; 1.2334 ) . I would want to display these points on a graph, using rectangles (a rectangle illustrates a point, and has its coordinates set to its point's ones - moreover, it has a size of 10*10). Rectangles like (... ; Y) should be displayed above any rectangles like (... ; Y-1) (positive Y direction is up). Thus, I must set the graph's origin not at the top-left hand

问题 I am trying to rotate an animated gif stored in an ImageIcon using an AffineTransform. The result is that the image does not get drawn. Here's my code: AffineTransform trans = AffineTransform.getRotateInstance(imgYaw, img.getImage().getWidth(null) / 2, img.getImage().getHeight(null) / 2); AffineTransformOp transo = new AffineTransformOp(trans, AffineTransformOp.TYPE_BILINEAR); BufferedImage bufferedimg = new BufferedImage(img.getImage().getWidth(null), img.getImage().getHeight(null),