perspectivecamera

I have a camera in my app: camera = new THREE.PerspectiveCamera( 75, window.innerWidth / window.innerHeight, 0.1, 1000 ); camera.position.z = 1; camera.position.y = -5; camera.rotateOnAxis(new THREE.Vector3(1, 0, 0), degInRad(90)); camera.up = new THREE.Vector3(0, 0, 1); Those code in render function must rotate the camera while I'm pressing the keys: if (leftPressed) { camera.rotateOnAxis((new THREE.Vector3(0, 1, 0)).normalize(), degInRad(1)); } else if (rightPressed) { camera.rotateOnAxis((new THREE.Vector3(0, 1, 0)).normalize(), degInRad(-1)); } if (upPressed) { camera.rotateOnAxis((new

This question already has an answer here: Three.js - Width of view 1 answer I made a small three.js app that moves a bunch of circles from the bottom of the canvas to the top: let renderer, scene, light, circles, camera; initialize(); animate(); function initialize() { renderer = new THREE.WebGLRenderer({ alpha: true, antialias: true }); renderer.setSize(window.innerWidth, window.innerHeight); document.body.appendChild(renderer.domElement); scene = new THREE.Scene(); light = new THREE.AmbientLight(); scene.add(light); circles = new THREE.Group(); scene.add(circles); camera = new THREE

Over the past weeks I've tried learning to rectify images and with the help of the people here I've managed to understand it better. About a week ago I set up a test example which I wanted to rectify (view the image from above). This worked fine (original: http://sitedezign.net/original.jpg and rectified: http://sitedezign.net/rectified.jpg ) with the function T = cv2.getPerspectiveTransform(UV_cp, XYZ_gcp) where T becomes the Homography. When I tried to do this with real world photos it failed because the realworld coordinates aren't perfectly on a plane (but simply around 10 control points

I'm working on depth map with OpenCV . I can obtain it but it is reconstructed from the left camera origin and there is a little tilt of this latter and as you can see on the figure, the depth is "shifted" (the depth should be close and no horizontal gradient): I would like to express it as with a zero angle, i try with the warp perspective function as you can see below but i obtain a null field... P = np.dot(cam,np.dot(Transl,np.dot(Rot,A1))) dst = cv2.warpPerspective(depth, P, (2048, 2048)) with : #Projection 2D -> 3D matrix A1 = np.zeros((4,3)) A1[0,0] = 1 A1[0,2] = -1024 A1[1,1] = 1 A1[1,2

Im changing an image from front perspective to a bids eye view by using getHomography and warpPerspective. It works in that the image warps to the desired perspective but the crop is off. It moves the warped image largely outside the image box. I assume the reason is because the operation results in negative coordinates. I have calculated the points for calculation of the translation matrix manually and not by using any of opencv:s functions for doing that since i.e. the chessboard functions failed to detect the proper points. I guess this can be fixed by doing additional changes to the

Recently, I have been studying the pinhole camera model, but I was confused with the model provided by OpenCV and the " Multiple View geometry in computer vision " textbook. I know that the following photo is a simplified model which switch the position of the image plane and the camera frame. For better illustration and understanding, and taking consideration of the principal point (u0,v0), the relation between two frames is x=f(X/Z)+u0 and y=f(Y/Z)+v0 . However,I was really confused because normally the image coordinate is in the form of the 4th quadrant coordinate as the following one!

I found very useful example from images stitching but my problem was those type of images here is an exemple and here is an other image when i use opencv stitcher the reult imaages is getting smaller like this one is there any method to apply a transform into the input images so they will be like this one here is the code #include <opencv2/core/core.hpp> #include <opencv2/highgui/highgui.hpp> #include<opencv2/opencv.hpp> #include <opencv2/features2d/features2d.hpp> #include <opencv2/nonfree/nonfree.hpp> #include <opencv2/stitching/stitcher.hpp> #include<vector> using namespace cv; using