cv2.error: C:\projects\opencv-python\opencv\modules\highgui\src\window.cpp:325: error: (-215) size.width>0 && size.height>0 in function cv::imshow

Question

I pass the image name as a parameter to this function:

def main(imageName):
    image = cv2.imread(imageName)
    cv2.imshow('color_image', image)
    gray_image =  grey(image)
    cv2.imshow("gray_image", gray_image)
    cv2.waitKey(0)
    clahe_image = clahe(gray_image,0)
    cv2.imshow("clahe_image", clahe_image)
    cv2.waitKey(0)
    dst_img = denoise(clahe_image)
    cv2.imshow("dst_img", dst_img)
    cv2.waitKey(0)
    binary_img = threshld(dst_img,0)
    cv2.imshow("binary_img", binary_img)
    cv2.waitKey(0)
    skiw_img = deskew(binary_img)
    cv2.imshow("skiw_img", skiw_img)
    cv2.imwrite("skiw_img.png", skiw_img)
    cv2.waitKey(0)

then i get that error.but when i execute it without parameter

def main():
    image = cv2.imread('e2nn.png')
    cv2.imshow('color_image', image)
    gray_image =  grey(image)
    cv2.imshow("gray_image", gray_image)
    cv2.waitKey(0)
    clahe_image = clahe(gray_image,0)
    cv2.imshow("clahe_image", clahe_image)
    cv2.waitKey(0)
    dst_img = denoise(clahe_image)
    cv2.imshow("dst_img", dst_img)
    cv2.waitKey(0)
    binary_img = threshld(dst_img,0)
    cv2.imshow("binary_img", binary_img)
    cv2.waitKey(0)
    skiw_img = deskew(binary_img)
    cv2.imshow("skiw_img", skiw_img)
    cv2.imwrite("skiw_img.png", skiw_img)
    cv2.waitKey(0)

i did not get that error and it execute well.

You can pass the name if the image and the script lie within the same folder. It is best to pass the entire path of the image. — Jeru Luke, Jun 17 '18 at 04:28
Try passing the path as well like: `C:/Users/Jackson/Desktop/home.jpg` — Jeru Luke, Jun 17 '18 at 06:11
Possible duplicate of [OpenCV Error: Assertion failed (size.width>0 && size.height>0) simple code](https://stackoverflow.com/questions/31341845/opencv-error-assertion-failed-size-width0-size-height0-simple-code) — Jeru Luke, Jun 17 '18 at 06:38
Here are about 120 ideas on what the problem might be... https://stackoverflow.com/search?q=%5Bopencv%5D+is%3Aq+%22-215%22+imshow — beaker, Jun 17 '18 at 15:37

score 1 · Accepted Answer · answered Jun 17 '18 at 06:55

This error comes up when no image (the array containing the image information) reaches the imshow() function. This is caused because your imread() function is not returning the desired output. Common mistakes include the following:

Incorrect Image Name: Check the name of the image right down to the format. Even jpg and jpeg are different.
Incorrect Path: In the case that your image is not in the same directory, put the full path to the image. Since you're using Windows, don't forget to change the backslash to forward. Those using Ubuntu should ensure that they put a '\' before home eg '\home\username\Desktop'
Access Issues: This is more prevalent for linux users but sometime you might not have read access to the image. Try using chmod 777 and run your code again. Please note that it is advised to change the access back to something more restrictive.

cv2.error: C:\projects\opencv-python\opencv\modules\highgui\src\window.cpp:325: error: (-215) size.width>0 && size.height>0 in function cv::imshow

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