Python - OpenCV - imread - Displaying Image

Question

I am currently working on reading an image and displaying it to a window  I have successfully done this  but upon displaying the image  the window only allows me to see a portion of the full image   I tried saving the image after loading it  and it saved the entire image   So I am fairly certain that it is reading the entire image     imgFile   cv imread  1 jpg    cv imshow  dst rt   imgFile  cv waitKey 0  cv destroyAllWindows     Image    Screenshot

User · Answer

This can help you  namedWindow   Display window   CV WINDOW AUTOSIZE      Create a window for display  imshow   Display window   image                         Show our image inside it

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In openCV whenever you try to display an oversized image or image bigger than your display resolution you get the cropped display  It s a default behaviour  In order to view the image in the window of your choice openCV encourages to use named window  Please refer to namedWindow documentation  The function namedWindow creates a window that can be used as a placeholder for images and trackbars  Created windows are referred to by their names   cv namedWindow name  flags CV WINDOW AUTOSIZE  where each window is related to image container by the name arg  make sure to use same name  eg   import cv2 frame   cv2 imread  1 jpg   cv2 namedWindow  Display 1   cv2 resizeWindow  Display 1   300  300  cv2 imshow  Display 1   frame

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Looks like the image is too big and the window simply doesn t fit the screen  Create window with the cv2 WINDOW NORMAL flag  it will make it scalable  Then you can resize it to fit your screen like this   from   future   import division import cv2   img   cv2 imread  1 jpg    screen res   1280  720 scale width   screen res 0    img shape 1  scale height   screen res 1    img shape 0  scale   min scale width  scale height  window width   int img shape 1    scale  window height   int img shape 0    scale   cv2 namedWindow  dst rt   cv2 WINDOW NORMAL  cv2 resizeWindow  dst rt   window width  window height   cv2 imshow  dst rt   img  cv2 waitKey 0  cv2 destroyAllWindows     According to the OpenCV documentation CV WINDOW KEEPRATIO flag should do the same  yet it doesn t and it s value not even presented in the python module

[python] Python - OpenCV - imread - Displaying Image

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