Skip to content

OpenCV:Highgui

While OpenCV was designed for use in full-scale applications and can be used within functionally rich UI frameworks (such as Qt, WinForms, or Cocoa*) or without any UI at all, sometimes there it is required to try functionality quickly and visualize the results. This is what the HighGUI module has been designed for.

It provides easy interface to:

  • Create and manipulate windows that can display images and "remember" their content
    (no need to handle repaint events from OS).
  • Add trackbars to the windows, handle simple mouse events as well as keyboard commands.
  • Read and write images to/from disk or memory.
  • Read video from camera or file and write video to a file.

User Interface

  • createTrackbar
  • getTrackbarPos
  • imshow
  • namedWindow
  • destroyWindow
  • destroyAllWindows
  • MoveWindow
  • ResizeWindow
  • SetMouseCallback
  • setTrackbarPos
  • waitKey
  • setOpenGlDrawCallback
  • setOpenGlContext
  • updateWindow

Reading and Writing Images and Video

  • imdecode
  • imencode
  • imread
  • imwrite
  • VideoCapture
  • VideoCapture::VideoCapture
  • VideoCapture::open
  • VideoCapture::isOpened
  • VideoCapture::release
  • VideoCapture::grab
  • VideoCapture::retrieve
  • VideoCapture::read
  • VideoCapture::get
  • VideoCapture::set
  • VideoWriter
  • VideoWriter::VideoWriter
  • ReleaseVideoWriter
  • VideoWriter::open
  • VideoWriter::isOpened
  • VideoWriter::write

Boolean Type 의 Mask 이미지 저장 방법

단순히 255를 곱하면 된다. 

cv2.imwrite('mask.png', maskimg * 255)

Qt New Functions

  • setWindowProperty
  • getWindowProperty
  • fontQt
  • addText
  • displayOverlay
  • displayStatusBar
  • setOpenGlDrawCallback
  • saveWindowParameters
  • loadWindowParameters
  • createButton

Troubleshooting

HIGHGUI ERROR: V4L/V4L2: VIDIOC_S_CROP

OpenCV:Troubleshooting#HIGHGUI ERROR: V4L/V4L2: VIDIOC_S_CROP 항목 참조.

cv2.namedWindow 호출시 멈추는 현상

OpenCV:Troubleshooting#cv2.namedWindow() 호출시 멈추는 현상 항목 참조.

Favorite site