Mat, Pixel type

Minhyeok의 Notion - 노션에서 옮기는 중

Pixel type

• CV_8U: 8-bit unsigned integer: uchar ( 0~255 )
• CV_8S: 8-bit signed integer: schar ( -128~127 )
• CV_16U: 16-bit unsigned integer: ushort ( 0~65535 )
• CV_16S: 16-bit signed integer: short ( -32768~32767 )
• CV_32S: 32-bit signed integer:
  int ( -2147483648~2147483647 )
• CV_32F: 32-bit floating-point number:
  float ( -FLT_MAX~FLT_MAX, INF, NAN )
• CV_64F: 64-bit floating-point number:
  double (-DBL_MAX~ DBL_MAX, INF, NAN )
• Multi-channel array: CV_8UC3, CV_8U(3), CV_64FC4, CV_64FC(4)

Copy

• Shallow copy
  • the address for data is copied
• Deep copy
  • Mat m2 = m1.clone();
  • m1.copyTo(m2);

Conversion

• convertTo: 타입변환
  • setTo: 특정 값으로 변환
  • convertScaleAbs: 스케일링 후 절대값

VideoCapture

• get()
  • CAP_PROP_POS_FRAMES:
    • 0-based index of the frame to be decoded/captured next.
  • CAP_PROP_FPS:
  • CAP_PROP_FRAME_COUNT:
  • CAP_PROP_FRAME_WIDTH
  • CAP_PROP_FRAME_HEIGHT
• 속도
  • waitKey(delay); delay=1000/fps(x1)
  • waitKey(0); forever