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我正在尝试使用 OpenCV 从耐克图像中提取标签。这是一个教程代码,取自:

http://opencv-code.com/tutorials/ocr-ing-nikes-new-rsvp-program/

我已经修改了几行代码,并且该部分没有错误(不确定它是否有效,因为我无法成功完全运行它。)

当我运行命令'python a.py'时。显示此错误:-

Traceback (most recent call last):
  File "a.py", line 42, in <module>
    otcnt = [c for c in cnt if cv2.contourArea(c) < 100]
TypeError: contour is not a numpy array, neither a scalar

a.py:-

#!/usr/bin/env python
import numpy as np
import cv2
import cv2.cv as cv

def do_ocr(img0):
  pass

if __name__ == "__main__":
  img0 = cv2.imread('nike-1.jpg')
  if img0 == None:
    import sys
    sys.exit()
  do_ocr(img0)
img1 = cv2.cvtColor(img0, cv2.COLOR_BGR2GRAY)
img2 = cv2.adaptiveThreshold(img1, 255, cv2.ADAPTIVE_THRESH_GAUSSIAN_C, cv2.THRESH_BINARY_INV, 45, 0)
size = np.size(img2)
skel = np.zeros(img2.shape,np.uint8)

ret,img2 = cv2.threshold(img2,127,255,0)
element = cv2.getStructuringElement(cv2.MORPH_CROSS,(3,3))
done = False 
while( not done):
    eroded = cv2.erode(img2,element)
    temp = cv2.dilate(eroded,element)
    temp = cv2.subtract(img2,temp)
    skel = cv2.bitwise_or(skel,temp)
    img2 = eroded.copy()

    zeros = size - cv2.countNonZero(img2)
    if zeros==size:
        done = True
img3 = img2
img4 = cv2.copyMakeBorder(img3, 1, 1, 1, 1, cv2.BORDER_CONSTANT, value=0)
cv2.floodFill(img4, None, (0,0), 255)
img5 = cv2.erode(255-img4, np.ones((3,3), np.uint8), iterations=2)
cnt = cv2.findContours(img5, cv2.RETR_EXTERNAL, cv2.CHAIN_APPROX_NONE)[0]
cnt = [c for c in cnt if cv2.contourArea(c) > 5000]
mask = np.zeros(img0.shape[:2], np.uint8)
cv2.drawContours(mask, cnt, -1, 255, -1)
dst = img2 & mask
cnt = cv2.findContours(dst.copy(), cv2.RETR_EXTERNAL, cv2.CHAIN_APPROX_NONE)
otcnt = [c for c in cnt if cv2.contourArea(c) < 100]
cv2.drawContours(dst, otcnt, -1, 0, -1)
api = tesseract.TessBaseAPI()
api.Init(".", "eng", tesseract.OEM_DEFAULT)
api.SetVariable("tessedit_char_whitelist", "#ABCDEFGHIJKLMNOPQRSTUVWXYZ")
api.SetPageSegMode(tesseract.PSM_SINGLE_LINE)

image = cv.CreateImageHeader(dst.shape[:2], cv.IPL_DEPTH_8U, 1)
cv.SetData(image, dst.tostring(), dst.dtype.itemsize * dst.shape[1])
tesseract.SetCvImage(image, api)
print api.GetUTF8Text().string()

我对 Python 编程(和 Python 语法)非常陌生,无论如何我都必须在 Python 中做到这一点。如果您可以发布它的完整正确版本或指出哪一行代码应该替换为哪一行,我将非常感谢您。

谢谢

ps我在stackoverflow上的第一个问题,如果不遵循任何约定,我深表歉意。

4

1 回答 1

9

此运行时错误是由于当您cnt在第 42 行重新定义为

cnt = cv2.findContours(dst.copy(), cv2.RETR_EXTERNAL, cv2.CHAIN_APPROX_NONE)

你正在设置它是两个返回值的元组cv2.findContours。查看您之前在第 37 行对函数的调用作为指导。您需要做的就是将第 42 行更改为

cnt = cv2.findContours(dst.copy(), cv2.RETR_EXTERNAL, cv2.CHAIN_APPROX_NONE)[0]

您的下一个问题是您尚未导入tesseract.

于 2013-07-13T16:50:24.303 回答