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Primary source: docs.opencv.org/4.13.0/dc/dbb/tutorial_py_calibration.html

Verified locator: OpenCV4.13.0: Re-projection Error section, projectPoints() comparison and calibration geometry. Reported RMS formula is explicitly defined in the new article; the tutorial example uses its own aggregation.

Primary source: docs.opencv.org/4.13.0/dd/d53/tutorial_py_depthmap.html

Verified locator: OpenCV4.13.0: Basics, block-matching code, disparity image, texture/speckle/uniqueness filters.

Primary source: docs.opencv.org/4.13.0/d3/d14/tutorial_ximgproc_disparity_filtering.html

Verified locator: Introduction: matching errors in half-occlusions and depth discontinuities, invalidation and propagation/filtering alternatives.

Primary source: docs.opencv.org/4.13.0/da/de9/tutorial_py_epipolar_geometry.html

Verified locator: OpenCV4.13.0 Basic Concepts; epipolar plane/line, fundamental-matrix point-to-line mapping and computeCorrespondEpilines. Matrix example derived independently.

Primary source: docs.opencv.org/4.13.0/da/d54/group__imgproc__transform.html

Verified locator: OpenCV4.13.0 Detailed Description: destination-to-source mapping, interpolation/extrapolation; resize() area interpolation for shrinking.