python - 关于分帧算法/提取Python中某个感兴趣的对象

Question

您好，对于个人项目，我需要从图像中裁剪出这个水下门，并保留除门以外的任何内容。图像在这里是彩色的，但我可以假设我收到的门的图像只会有内衬，门是白线，背景是黑色。谁能给我任何有关如何解决此解决方案的建议？我是 OpenCV 的新手，所以我有点迷茫。

Answer 1

这是主要思想

• 高斯模糊图像并提取蓝色 channel
• 使用 cv2.threshold() 阈值图像
• 使用 cv2.erode()
进行腐 eclipse 以去除黑线并隔离门
• 使用 cv2.findContours() 和 cv2.contourArea()
查找轮廓并过滤门轮廓
• 使用 cv2.dilate() 创建 mask 和膨胀图像
• 使用 cv2.bitwise_and() 裁剪门

import cv2
import numpy as np

# Load in image and create copy
image = cv2.imread('1.png')
original = image.copy()

# Gaussian blur and extract blue channel
blur = cv2.GaussianBlur(image, (3,3), 0)
blue = blur[:,:,0]

# Threshold image and erode to isolate gate contour
thresh = cv2.threshold(blue,135, 255, cv2.THRESH_BINARY_INV)[1]
kernel = cv2.getStructuringElement(cv2.MORPH_RECT, (3,3))
erode = cv2.erode(thresh, kernel, iterations=4)

# Create a mask and find contours
mask = np.zeros(original.shape, dtype=np.uint8)
cnts = cv2.findContours(erode, cv2.RETR_EXTERNAL, cv2.CHAIN_APPROX_SIMPLE)
cnts = cnts[0] if len(cnts) == 2 else cnts[1]

# Filter for gate contour using area and draw onto mask
for c in cnts:
    area = cv2.contourArea(c)
    if area > 6000:
        cv2.drawContours(mask, [c], -1, (255,255,255), 2)

# Dilate to restore contour and mask it with original image
dilate = cv2.dilate(mask, kernel, iterations=7)
result = cv2.bitwise_and(original, dilate)

cv2.imshow('thresh', thresh)
cv2.imshow('erode', erode)
cv2.imshow('mask', mask)
cv2.imshow('dilate', dilate)
cv2.imshow('result', result)
cv2.waitKey()