OpenCV resize fails on large image with error -215 ssize area 0 in function cv resize

Question

I m using OpenCV 3 0 0 and Python 3 4 3 to process a very large RGB image  107162 79553 3   While I m trying to resize it using the following code    import cv2 image   cv2 resize img   0 0   fx 0 5  fy 0 5  interpolation cv2 INTER AREA    I had this error message coming up    cv2 error  C  opencv-3 0 0 source modules imgproc src imgwarp cpp 3208  error   -215  ssize area     0 in function cv  resize   I m certain there is image content in the image array because I can save them into small tiles in jpg format  When I try to resize just a small part of the image  there is no problem and I end up with correctly resized image   Taking a rather big chunk  50000 50000 3  still won t work  but it will work on a  10000 10000 3  chunk     I m wondering what could cause this problem and how I can solve this    Thanks

User · Answer

I had the same error  Resizing the images resolved the issue  However  I used online tools to resize the images because using pillow to resize them did not solve my problem

User · Answer

Turns out I had a  csv file at the end of the folder from which I was reading all the images  Once I deleted that it worked alright  Make sure that it s all images and that you don t have any other type of file

User · Answer

In my case I did a wrong modification in the image   I was able to find the problem checking the image shape   print img shape

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So it turns out that the problem comes from one line in modules imgproc src imgwarp cpp   CV Assert  ssize area    gt  0      When the product of rows and columns of the image to be resized is larger than 2 31  ssize area   results in a negative number   This appears to be a bug in OpenCV and hopefully will be fixed in the future release   A temporary fix is to build OpenCV with this line commented out   While not ideal  it works for me    And I just recently found out that the above applies only to image whose width is larger than height  For images with height larger than width  it s the following line that causes error    CV Assert  dsize area    gt  0      So this has to be commented out as well

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Turns out for me this error was actually telling the truth - I was trying to resize a Null image  which was usually the  last  frame of a video file  so the assertion was valid     Now I have an extra step before attempting the resize operation  which is to do the assertion myself   def getSizedFrame width  height      Function to return an image with the size I want            s  img   self cam read          Only process valid image frames     if s              img   cv2 resize img   width  height   interpolation   cv2 INTER AREA      return s  img   Now I don t see the error

User · Answer

I am having OpenCV version 3 4 3 on MacOS  I was getting the same error as above   I changed my code from  frame   cv2 resize frame   0 0   fx 0 5  fy 0 5       to  frame   cv2 resize frame  None  fx 0 5  fy 0 5        Now its working fine for me

User · Answer

I was working with 3 files  The python script  the image  and the trained model   Everything worked when I moved these 3 files into their own folder instead of in the directory with the other python scripts

User · Answer

Also pay attention to the object type of your numpy array  converting it using  astype  uint8   resolved the issue for me

User · Answer

In my case    image   cv2 imread filepath  final img   cv2 resize image  size img    filepath was incorrect  cv2 imshow didn t give any error in this case but due to wrong path cv2 resize was giving me error

User · Answer

I know this is a very old thread but I had the same problem which was due spaces in the images names   e g      Image name   hello o jpg    weirdly  by removing the spaces the function worked just fine      Image name   hello o jpg

User · Answer

You can manually place a check in your code  Like this -       if result                for face in result              bounding box   face  box               x  y  w  h   bounding box 0   bounding box 1   bounding box 2   bounding box 3              rect face   cv2 rectangle frame   x  y    x w  y h    46  204  113   2              face   rgb y y h  x x w                CHECK FACE SIZE  EXIST OR NOT              if face shape 0  face shape 1   gt  0                   predicted name  class probability   face recognition face                   print  Result     predicted name  class probability

User · Answer

For me the following work-around worked    split the array up into smaller sub arrays resize the sub arrays merge the sub arrays again   Here the code   def split up resize arr  res               function which resizes large array  direct resize yields error  addedtypo                  compute destination resolution for subarrays     res 1    res 0   res 1  2      res 2    res 0   res 1  - res 1  2         get sub-arrays     arr 1   arr 0   len arr  2      arr 2   arr len arr  2           resize sub arrays     arr 1   cv2 resize arr 1  res 1  interpolation   cv2 INTER LINEAR      arr 2   cv2 resize arr 2  res 2  interpolation   cv2 INTER LINEAR         init resized array     arr   np zeros  res 1   res 0           merge resized sub arrays     arr 0   len arr  2    arr 1     arr len arr  2      arr 2      return arr

User · Answer

This type of error also takes place because the resize is unable to get the image in simple the directory of the image may be wrong In my case I left the forward slash during providing the location of file and this error took place after I put the slash problem was solved

[python] OpenCV resize fails on large image with "error: (-215) ssize.area() > 0 in function cv::resize"

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