Stereo camera calibration

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0.5 or smaller would be a nice calibration error, rinse and repeat.

how many images did you take ? just those 2 ? you'll need like 20-30 pairs, the whole field of view should be covered, especially the corners of your image.

make sure, your paper chessboard is absolutely plan, no wrinkles or such, any millimeter counts !

Thank you for the comment. Previously, i was working with only 14 image pair. Now i tried with 29. I see the epipolar lines matching nicely unlike above image. But RMS error = 1.56 average epipolar error = 2.6 . still remain higher.

cv::CommandLineParser parser(argc, argv, "{w|9|}{h|6|}{s|20|}{nr||}{help||}{@input|stereo_calib.xml|}");
float squareSize = parser.get<float>("s");

My square size is 20mm. The argument for variable S should in mm right.