I am trying to use the opencv multi camera calibration from http://docs.opencv.org/trunk/d2/d1c/tutorial_multi_camera_main.html.
What size of random pattern should i generate? I tried the code at bo lis page with various size of the pattern but every time the code failed with two types of errors.
- Invalid photo due to too few matches with pattern.
- Invalid photo due to too few inliers by Fundam./Homog. Matrix check
Is the distance between the sensor and the calibration board important to decide the size of the pattern image? I capture the images(IR) using a depth sensor with incandescent light as IR source(IR projector is closed with cardboard). The minimum distance of the board from the sensor is 40cm. So I cant go closer.