Question

任何机构都可以解决错误：我正在尝试对包含数字的ROI进行细分。该代码适用于某些图像。但是对于其他人则显示以下错误：

---------------------------------------------------------------------------
IndexError                                Traceback (most recent call last)
<ipython-input-58-1a8d1317985a> in <module>
      1 #segment digits from images in Marks folder
----> 2 digits_in_cell("./Cropped/Marks/")

<ipython-input-57-8fe190745c08> in digits_in_cell(cropped_dir_path)
     23             cv2.CHAIN_APPROX_SIMPLE)
     24 
---> 25         cnts = cnts[0] if imutils.is_cv2() else cnts[1]
     26 
     27         orig = cell.copy()

IndexError: list index out of range

这是我的代码：

    i=7
    cell = cv2.imread(str(i) + '.png')
    gray = cv2.cvtColor(cell, cv2.COLOR_BGR2GRAY)
    gray = cv2.GaussianBlur(gray, (7, 7), 0)
    # threshold the image
    ret,thresh1 = cv2.threshold(gray ,112,255,cv2.THRESH_BINARY_INV)
    cv2.imshow("Image", thresh1) 
    cv2.waitKey(0)

    # dilate the white portions
    dilate = cv2.dilate(thresh1, None, iterations=5)
    cv2.imshow("Image", dilate) 
    cv2.waitKey(0)

    # find contours in the image
    cnts, hierarchy = cv2.findContours(dilate.copy(), cv2.RETR_EXTERNAL,
        cv2.CHAIN_APPROX_SIMPLE)

    cnts = cnts[0] if imutils.is_cv2() else cnts[1]

    orig = cell.copy()


    #for cnt in cnts:
        # Check the area of contour, if it is very small ignore it
        #if(cv2.contourArea(cnt) < 100):
         #   continue

        # Filtered countours are detected
    x,y,w,h = cv2.boundingRect(cnts)

    # Taking ROI of the cotour
    roi = cell[y:y+h, x:x+w]

    # Mark them on the image if you want
    cv2.rectangle(orig,(x,y),(x+w,y+h),(0,255,0),2)

    # Save your contours or characters
    cv2.imwrite("roi" + str(i) + ".png", roi)

    i = i + 1 

    cv2.imshow("Image", orig) 
    cv2.waitKey(0)

Answer 1

行的执行

cnts, hierarchy = cv2.findContours

返回cnts变量的空列表。这只是意味着该函数没有找到任何轮廓，但是在下一行中，您正在请求第一个轮廓，因此会出现错误。

有人可以帮助我解决以下错误：“列表索引超出范围”吗？

1 个答案: