perspective

I'm trying to implement a cropping & perspective correction feature into an upcoming app. Whilst doing research, I came across: Executing cv::warpPerspective for a fake deskewing on a set of cv::Point http://sudokugrab.blogspot.ch/2009/07/how-does-it-all-work.html So I decided to try implementing this feature with OpenCV - the framework is there so the installation was fast. However, I'm not getting the results I hoped for: (2nd picture is the result) I've translated all the code to work with Xcode and triple checked the Coordinates. Can you tell me what is wrong with my code? For the sake of

I am trying to do a perspective correction of a tilted rectangle ( a credit card), which is tilted in all the 4 directions. I could find its four corners and the respective angles of its tilt but I cannot find the exact location of the coordinates, where it has to be projected. I am using cv2.getPerspectiveTransform to do the transformation. I have the aspect ratio of the actual card (the non tilted one), I want such coordinates such that the original aspect ratio is preserved. I have tried using a bounding rectangle but this increases the size of the card. Any help would be appreciated. Here

How is it possible to distort paths in SVG in browser so that they are distorted to certain perspective using possibly javascript or css? The perspective distort can be made easily in Photoshop, Illustrator etc, but how about browsers? This is source path: And this is the path after transformation: This is my drag distort proposal ( share you knowledge, Q&A-style ). Live example is in http://jsfiddle.net/xjHUk/278/ and the main code is this: (only output window: http://jsfiddle.net/xjHUk/279/embedded/result/ ) function transferPoint (xI, yI, source, destination) { var ADDING = 0.001; // to

I'm trying to perform a skew on an image, like one shown here (source: microsoft.com ) . I have an array of pixels representing my image and am unsure of what to do with them. Jacob A much better way to do this is by inverse mapping. Essentially, you want to "warp" the image, right? Which means every pixel in the source image goes to a predefined point - the predefinition is a transformation matrix which tells you how to rotate, scale, translate, shear, etc. the image which is essentially taking some coordinate (x,y) on your image and saying that, "Ok, the new position for this pixel is (f(x)

Sometimes was a problem what is the rectangle 3D rotated and be perspective transition (for example in CSS) draw as the tetragon. But we want obtain the rectangle (width, length, Euler angle, perspective) transformed via rotate and perspective draw as the tetragon. figure fig.1 points a,c diagonal rectangle(yellow) points A,C diagonal tetragon(shadow) (red) fig.2 a,b,c,d rectangle points(yellow) A,B,C,D shadow(tetragon) (red) Ivan.s Solve: Coordinate system: The origin of the coordinate system is coincident with diagonals intersection point. Axe Z normal to the tetragon. Axe X crosses point A