OpenCV Python - Image too big to display

Question

I have an image that is 6400    3200  while my screen is 1280 x 800  Therefore  the image needs to be resized for display only  I am using Python and OpenCV 2 4 9  According to OpenCV Documentation       If you need to show an image that is bigger than the screen resolution  you will need to call namedWindow     WINDOW NORMAL  before the imshow    That is what I am doing  but the image is not fitted to the screen  only a portion is shown because it s too big  I ve also tried with cv2 resizeWindow  but it doesn t make any difference   import cv2 cv2 namedWindow  output   cv2 WINDOW NORMAL           Create window with freedom of dimensions   cv2 resizeWindow  output   400  300                 Resize window to specified dimensions im   cv2 imread  earth jpg                            Read image cv2 imshow  output   im                               Show image cv2 waitKey 0                                         Display the image infinitely until any keypress

User · Answer

Try this   image   cv2 imread  img Demo jpg   image   cv2 resize image  240 240     The image is now resized  Displaying it will render in 240x240

User · Answer

In opencv  cv namedWindow   just creates a window object as you determine  but not resizing the original image  You can use cv2 resize img  resolution  to solve the problem   Here s what it displays  a 740   411 resolution image    image   cv2 imread  740 411 jpg   cv2 imshow  image   image  cv2 waitKey 0  cv2 destroyAllWindows     Here  it displays a 100   200 resolution image after resizing  Remember the resolution parameter use column first then is row     image   cv2 imread  740 411 jpg   image   cv2 resize image   200  100   cv2 imshow  image   image  cv2 waitKey 0  cv2 destroyAllWindows

User · Answer

Although I was expecting an automatic solution  fitting to the screen automatically   resizing solves the problem as well       import cv2 cv2 namedWindow  output   cv2 WINDOW NORMAL           Create window with freedom of dimensions im   cv2 imread  earth jpg                            Read image imS   cv2 resize im   960  540                        Resize image cv2 imshow  output   imS                               Show image cv2 waitKey 0                                         Display the image infinitely until any keypress

User · Answer

Looks like opencv lib is pretty sensitive to parameters passed to the methods  The following code worked for me using opencv 4 3 0  win name    quot visualization quot      1  use var to specify window name everywhere cv2 namedWindow win name  cv2 WINDOW NORMAL      2  use  normal  flag img   cv2 imread filename  h w   img shape  2      suits for image containing any amount of channels h   int h   resize factor      one must compute beforehand w   int w   resize factor      and convert to INT cv2 resizeWindow win name  w  h      use variables defined computed BEFOREHAND cv2 imshow win name  img

User · Answer

Try with this code   from PIL import Image  Image fromarray image  show

User · Answer

The other answers perform a fixed  width  height  resize  If you wanted to resize to a specific size while maintaining aspect ratio  use this  def ResizeWithAspectRatio image  width None  height None  inter cv2 INTER AREA       dim   None      h  w    image shape  2       if width is None and height is None          return image     if width is None          r   height   float h          dim    int w   r   height      else          r   width   float w          dim    width  int h   r        return cv2 resize image  dim  interpolation inter    Example  image   cv2 imread  img png   resize   ResizeWithAspectRatio image  width 1280    Resize by width OR   resize   ResizeWithAspectRatio image  height 1280    Resize by height   cv2 imshow  resize   resize  cv2 waitKey

User · Answer

Use this for example  cv2 namedWindow  finalImg   cv2 WINDOW NORMAL  cv2 imshow  quot finalImg quot  finalImg

[python] OpenCV & Python - Image too big to display

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