error: (-215:Assertion failed) src_depth != CV_16F && src_depth != CV_32S in function 'convertToShow' code example

Example 1: src_depth != CV_16F && src_depth != CV_32S

image = image.astype(np.uint8)

Example 2: error: (-215:Assertion failed) !_src.empty() in function 'cv::cvtColor'

This error happened because the image didn't load properly.
So you have problem with the previous line cv2.imread my suggestion is :

check if the images exist in the path you give

check the count variable if he have valid number

Example 3: (-215:Assertion failed) img.type() == CV_8UC1 in func

img_blur = cv2.medianBlur(self.cropped_img,5).astype('uint8')
img_thresh_Gaussian = cv2.adaptiveThreshold(img_blur, 255, cv2.ADAPTIVE_THRESH_GAUSSIAN_C, cv2.THRESH_BINARY, 11, 2)