v0.22.0

• bgsegm
  • Add BackgroundSubtractorCNT
• calib3d
  • Added undistort function (#520)
• core
  • add functions (singular value decomposition, multiply between matrices, transpose matrix) (#559)
  • Add new funcs (#578)
  • add setIdentity() method to Mat
  • add String method (#552)
  • MatType: add missing constants
• dnn
  • Adding GetLayerNames()
  • respect the bit depth of the input image to set the expected output when converting an image to a blob
• doc
  • change opencv version 3.x to 4.x
• docker
  • use Go1.13.5 for image
• imgcodecs
  • Fix webp image decode error (#523)
    imgcodecs: optimize copy of data used for IMDecode method
• imgproc
  • Add GetRectSubPix
  • Added ClipLine
  • Added InvertAffineTransform
  • Added LinearPolar function (#524)
  • correct ksize param used for MedianBlur unit test
  • Feature/put text with line type (#527)
  • FitEllipse
  • In FillPoly and DrawContours functions, remove func() wrap to avoid memory freed before calling opencv functions. (#543)
• objdetect
  • Add support QR codes
• opencv
  • update to OpenCV 4.2.0 release
• openvino
  • Add openvino async
• test
  • Tolerate imprecise result in SolvePoly
  • Tolerate imprecision in TestHoughLines