Python Opencv任意形状目标检测并绘制框图

opencv 进行任意形状目标识别,供大家参考,具体内容如下

工作中有一次需要在简单的图上进行目标识别,目标的形状不固定,并且存在一定程度上的噪声影响,但是噪声影响不确定。这是一个简单的事情,因为图像并不复杂,现在将代码公布如下:

import cv2

def otsu_seg(img):

ret_th, bin_img = cv2.threshold(img, 0, 255, cv2.THRESH_BINARY+cv2.THRESH_OTSU)

return ret_th, bin_img

def find_pole(bin_img):

img, contours, hierarchy = cv2.findContours(bin_img, cv2.RETR_TREE, cv2.CHAIN_APPROX_SIMPLE)

area = 0

for i in range(len(contours)):

area += cv2.contourArea(contours[i])

area_mean = area / len(contours)

mark = []

for i in range(len(contours)):

if cv2.contourArea(contours[i]) < area_mean:

mark.append(i)

return img, contours, hierarchy, mark

def draw_box(img,contours):

img = cv2.rectangle(img,

(contours[0][0], contours[0][1]),

(contours[1][0], contours[1][1]),

(255,255,255),

3)

return img

def main(img):

ret, th = otsu_seg(img)

img_new, contours, hierarchy, mark = find_pole(th)

for i in range(len(contours)):

if i not in mark:

left_point = contours[i].min(axis=1).min(axis=0)

right_point = contours[i].max(axis=1).max(axis=0)

img = draw_box(img, (left_point, right_point))

return img

if __name__ =="__main__":

img = cv2.imread('G:/test.png')

img = main(img)

cv2.imwrite('G:/test_d.png', img)

结果图如下:

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