gpt4 book ai didi

Python opencv 排序轮廓

转载 作者:太空狗 更新时间:2023-10-29 17:17:52 27 4
gpt4 key购买 nike

<分区>

我正在关注这个问题:

How can I sort contours from left to right and top to bottom?

从左到右和从上到下对轮廓进行排序。但是,我的轮廓是使用这个 (OpenCV 3) 找到的:

im2, contours, hierarchy = cv2.findContours(threshold,cv2.RETR_EXTERNAL,cv2.CHAIN_APPROX_SIMPLE)

它们的格式如下:

   array([[[ 1,  1]],

[[ 1, 36]],

[[63, 36]],

[[64, 35]],

[[88, 35]],

[[89, 34]],

[[94, 34]],

[[94, 1]]], dtype=int32)]

当我运行代码时

max_width = max(contours, key=lambda r: r[0] + r[2])[0]
max_height = max(contours, key=lambda r: r[3])[3]
nearest = max_height * 1.4
contours.sort(key=lambda r: (int(nearest * round(float(r[1])/nearest)) * max_width + r[0]))

我遇到了错误

ValueError: The truth value of an array with more than one element is ambiguous. Use a.any() or a.all()

所以我把它改成这样:

max_width = max(contours, key=lambda r:  np.max(r[0] + r[2]))[0]
max_height = max(contours, key=lambda r: np.max(r[3]))[3]
nearest = max_height * 1.4
contours.sort(key=lambda r: (int(nearest * round(float(r[1])/nearest)) * max_width + r[0]))

但现在我得到了错误:

类型错误:只有长度为 1 的数组可以转换为 Python 标量

编辑:

阅读下面的答案后我修改了我的代码:

编辑 2

这是我用来“放大”字符并找到轮廓的代码

kernel = cv2.getStructuringElement(cv2.MORPH_RECT,(35,35))

# dilate the image to get text
# binaryContour is just the black and white image shown below
dilation = cv2.dilate(binaryContour,kernel,iterations = 2)

编辑 2 结束

im2, contours, hierarchy = cv2.findContours(dilation,cv2.RETR_EXTERNAL,cv2.CHAIN_APPROX_SIMPLE)

myContours = []

# Process the raw contours to get bounding rectangles
for cnt in reversed(contours):

epsilon = 0.1*cv2.arcLength(cnt,True)
approx = cv2.approxPolyDP(cnt,epsilon,True)

if len(approx == 4):

rectangle = cv2.boundingRect(cnt)
myContours.append(rectangle)

max_width = max(myContours, key=lambda r: r[0] + r[2])[0]
max_height = max(myContours, key=lambda r: r[3])[3]
nearest = max_height * 1.4
myContours.sort(key=lambda r: (int(nearest * round(float(r[1])/nearest)) * max_width + r[0]))

i=0
for x,y,w,h in myContours:

letter = binaryContour[y:y+h, x:x+w]
cv2.rectangle(binaryContour,(x,y),(x+w,y+h),(255,255,255),2)
cv2.imwrite("pictures/"+str(i)+'.png', letter) # save contour to file
i+=1

排序前的轮廓:

[(1, 1, 94, 36), (460, 223, 914, 427), (888, 722, 739, 239), (35,723, 522, 228), 
(889, 1027, 242, 417), (70, 1028, 693, 423), (1138, 1028, 567, 643),
(781, 1030, 98, 413), (497, 1527, 303, 132), (892, 1527, 168, 130),
(37, 1719, 592, 130), (676, 1721, 413, 129), (1181, 1723, 206, 128),
(30, 1925, 997, 236), (1038, 1929, 170, 129), (140, 2232, 1285, 436)]

排序后的轮廓:

(注意:这不是我希望轮廓排序的顺序。请参阅底部的图像)

[(1, 1, 94, 36), (460, 223, 914, 427), (35, 723, 522, 228), (70,1028, 693, 423), 
(781, 1030, 98, 413), (888, 722, 739, 239), (889, 1027, 242, 417),
(1138, 1028, 567, 643), (30, 1925, 997, 236), (37, 1719, 592, 130),
(140, 2232, 1285, 436), (497, 1527, 303, 132), (676, 1721, 413, 129),
(892, 1527, 168, 130), (1038, 1929, 170, 129), (1181, 1723, 206, 128)]

我正在使用的图像

enter image description here

我想按以下顺序查找轮廓: enter image description here

用于寻找轮廓的扩张图像 enter image description here

27 4 0
Copyright 2021 - 2024 cfsdn All Rights Reserved 蜀ICP备2022000587号
广告合作:1813099741@qq.com 6ren.com