How to correct this barrel distortion

asked 2018-05-10 14:22:43 -0500

garbalawal gravatar image

updated 2018-05-14 02:30:44 -0500

Hello everyones, in my project, i have to calibrate with grid of square, i already have the calibration method the barrel distortion give me a wrong result. How can i undistort these square using homography or whatever without using a chesboard pattern i want all the square to be perfectly aligned. this i my image : https://ibb.co/mXobiy thanks for your help

i have found this answer : https://stackoverflow.com/questions/3... but the result is always bad, how can i adapt this for my case.

edit retag flag offensive close merge delete

Comments

The image looks like it is already good. What accuracy do you need (max tolerance for absolute pixel distance error)? Also, what is the main issue: (1) do you need higher accuracy i.e. further reduce the residual distortion error, or (2) did you find that feeding this good image into some estimation algorithm gave a worse output? If so, what estimation algorithm are you referring to? Thanks for your clarifications.

rwong gravatar imagerwong ( 2018-05-10 21:59:34 -0500 )edit

looks more like a slight perspective distortion to me.

bennog gravatar imagebennog ( 2018-05-11 00:52:13 -0500 )edit

I use those square for calibration, i already have the calibration algorithm and code, my goal is to cut some material based on data point line after image processing on captured picture, so i need to be very acurate so milliter precision, i have 4 photos device that i merge with straight segment(coordinate of extreme point given by calibration with user click on each extreme point ) on overlaping region. The problem is that when i merge the result is not accurate, i only need to do the process one time if photo device don't move, can i use something like this : http://www.kelvin-pro.com/sites/defau... photo device will not move for each picture or i can use an homography to find the best fit for each square and do my process? But i don't know how.

garbalawal gravatar imagegarbalawal ( 2018-05-11 03:05:26 -0500 )edit