Finds subpixel-accurate positions of the chessboard corners

[corners,success] = cv.find4QuadCornerSubpix(img, corners)
[...] = cv.find4QuadCornerSubpix(img, corners, 'OptionName', optionValue, ...)

Input

• img Input single-channel 8-bit image.
• corners Initial coordinates of the input corners, stored in numeric array (Nx2/Nx1x2/1xNx2) or cell array of 2-element vectors {[x,y], ...}. Supports single floating-point class.

Output

• corners Output refined coordinates, of the same size and type as the input corners (numeric or cell matching the input format).
• success boolean success value.

Options

• RegionSize region size [w,h]. default [3,3]