coordinate-transformation

Assume I have good correspondences between two images and attempt to recover the camera motion between them. I can use OpenCV 3's new facilities for this, like this: Mat E = findEssentialMat(imgpts1, imgpts2, focal, principalPoint, RANSAC, 0.999, 1, mask); int inliers = recoverPose(E, imgpts1, imgpts2, R, t, focal, principalPoint, mask); Mat mtxR, mtxQ; Mat Qx, Qy, Qz; Vec3d angles = RQDecomp3x3(R, mtxR, mtxQ, Qx, Qy, Qz); cout << "Translation: " << t.t() << endl; cout << "Euler angles [x y z] in degrees: " << angles.t() << endl; Now, I have trouble wrapping my head around what R and t

My goal is to create a plugin that enables zooming & panning operations on a page area, just like how Google Maps currently works (meaning: scrolling with the mouse = zooming in/out of the area, click & hold & move & release = panning). When scrolling, I wish to have a zoom operation centered on the mouse cursor. For this, I use on-the-fly CSS3 matrix transformations. The only, yet mandatory, constraint is that I cannot use anything else than CSS3 translate & scale transformations, with a transform origin of 0px 0px. Panning is out of the scope of my question, since I have it working already.

I have following details with me : <g transform="translate(20, 50) scale(1, 1) rotate(-30 10 25)"> Need to change above line to: <g transform="matrix(?,?,?,?,?,?)"> Can anyone help me to achieve this? Translate(tx, ty) can be written as the matrix: 1 0 tx 0 1 ty 0 0 1 Scale(sx, sy) can be written as the matrix: sx 0 0 0 sy 0 0 0 1 Rotate(a) can be written as a matrix: cos(a) -sin(a) 0 sin(a) cos(a) 0 0 0 1 Rotate(a, cx, cy) is the combination of a translation by (-cx, cy), a rotation of a degrees and a translation back to (cx, cy), which gives: cos(a) -sin(a) -cx × cos(a) + cy × sin(a) + cx

Using below code I can display an image in openGL control. Which is in rectangular shape. Now I want to project top and bottom area of this rectangular to a cylindrical shape.I mean need to perform a rectangular to cylidrical projection on openGL. How can I achieve this? private void CreateShaders() { /***********Vert Shader********************/ vertShader = GL.CreateShader(ShaderType.VertexShader); GL.ShaderSource(vertShader, @"attribute vec3 a_position; varying vec2 vTexCoord; void main() { vTexCoord = (a_position.xy + 1) / 2; gl_Position = vec4(a_position, 1); }"); GL.CompileShader

Hi I have a legacy db with some positional data. The fields are just text fields with strings like this 0°25'30"S, 91°7'W . Is there some way I can convert these to two floating point numbers for Decimal Latitude and Decimal Longitude ? EDIT: So an example would be: 0°25'30"S, 91°7'W -> 0.425 , 91.116667 where the original single field position yields two floats. Any help much appreciated. fraxel This approach can deal with seconds and minutes being absent, and I think handles the compass directions correctly: # -*- coding: latin-1 -*- def conversion(old): direction = {'N':1, 'S':-1, 'E': 1,

I am building a modeling program and I'd like to do transformations on objects in their own space and then assign that single object to a group to rotate around another axis which the group rotates around. However, I'd also like to be able to do transformations in the object's own space when it's combined. Manipulating the individual object, I pick the object's center. glm::mat4 transform; transform = glm::translate(transform, - obj.meshCenter); glm::mat4 transform1; transform1 = glm::translate(transform1, obj.meshCenter); obj.rotation = transform1*obj.thisRot*transform; I then send this off