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OpenCV-Python 选择ROI

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原文链接：https://blog.csdn.net/weierqiuba/article/details/70011375 原

OpenCV-Python 选择ROI

2019年06月01日 18:07:36 SongpingWang 阅读数 454更多分类专栏： OpenCV 计算机视觉

1. 矩形ROI，直接使用切片，简单粗暴

import cv2

src = cv2.imread(“D:\python_script\ffff\qipan.png”)
roi = src[20:150, 50:300 ]

cv2.imshow(‘roi’,roi)
cv2.waitKey(0)
cv2.destroyAllWindows()

2. 使用OpenCV中的一些函数获取ROI区域，这个用的最多

import numpy as np
from matplotlib import pyplot as plt
import cv2

src = cv2.imread(“D:\python_script\ffff\qipan.png”)

ROI = np.zeros(src.shape, np.uint8) #感兴趣区域ROI
proimage0 = src.copy() #复制原图

“”“提取轮廓”""
proimage1=cv2.cvtColor(proimage0,cv2.COLOR_BGR2GRAY) #转换成灰度图
proimage2=cv2.adaptiveThreshold(proimage1,255,cv2.ADAPTIVE_THRESH_GAUSSIAN_C,cv2.THRESH_BINARY_INV,7,7)
proimage3,contours,hierarchy=cv2.findContours(proimage2,cv2.RETR_CCOMP,cv2.CHAIN_APPROX_NONE) #提取所有的轮廓

“”“ROI提取”""
cv2.drawContours(ROI, contours, 1,(255,255,255),-1) #ROI区域填充白色，轮廓ID1
ROI=cv2.cvtColor(ROI,cv2.COLOR_BGR2GRAY) #转换成灰度图
ROI=cv2.adaptiveThreshold(ROI,255,cv2.ADAPTIVE_THRESH_GAUSSIAN_C,cv2.THRESH_BINARY_INV,7,7) #自适应阈值化
imgroi= cv2.bitwise_and(ROI,proimage3) #图像交运算，获取的是原图处理——提取轮廓后的ROI

titles = [‘Original Image’, ‘proimage1’,‘proimage2’, ‘proimage3’]
images = [proimage0, proimage1, proimage2, proimage3]
for i in range(4):
plt.subplot(2,2,i+1),plt.imshow(images[i],‘gray’)
plt.title(titles[i])
plt.xticks([])
plt.yticks([])
plt.show()

cv2.imshow(‘roi’,roi)
cv2.imshow(‘imgroi’,imgroi)
cv2.waitKey(0)
cv2.destroyAllWindows()

3. 使用鼠标获取ROI区域

OpenCV-python自带 API 可直接选择矩形区域作为ROI，该API位于目标追踪模块，主要是cv2.selectROI()函数

import cv2

img = cv2.imread(“D:\python_script\ffff\qipan.png”)

roi = cv2.selectROI(windowName=“roi”, img=img, showCrosshair=True, fromCenter=False)
x, y, w, h = roi

cv2.rectangle(img=img, pt1=(x, y), pt2=(x + w, y + h), color=(0, 0, 255), thickness=2)
cv2.imshow(“roi”, img)
cv2.waitKey(0)
cv2.destroyAllWindows()

4. 鼠标获取多边形ROI

多边形ROI，主要利用鼠标交互进行绘制：

单击左键，选择多边形的点；
单击右键，删除最近一次选择的点；
单击中键，确定ROI区域并可视化。
按”S“键，将多边形ROI区域的点保存到本地”config.pkl"文件中


import cv2
import numpy as np
import joblib

pts = [] # 用于存放点

# 统一的：mouse callback function
def draw_roi(event, x, y, flags, param):
img2 = img.copy()

<span class="token keyword">if</span> event <span class="token operator">==</span> cv2<span class="token punctuation">.</span>EVENT_LBUTTONDOWN<span class="token punctuation">:</span>  <span class="token comment"># 左键点击，选择点</span>
    pts<span class="token punctuation">.</span>append<span class="token punctuation">(</span><span class="token punctuation">(</span>x<span class="token punctuation">,</span> y<span class="token punctuation">)</span><span class="token punctuation">)</span>
<span class="token keyword">if</span> event <span class="token operator">==</span> cv2<span class="token punctuation">.</span>EVENT_RBUTTONDOWN<span class="token punctuation">:</span>  <span class="token comment"># 右键点击，取消最近一次选择的点</span>
    pts<span class="token punctuation">.</span>pop<span class="token punctuation">(</span><span class="token punctuation">)</span>
<span class="token keyword">if</span> event <span class="token operator">==</span> cv2<span class="token punctuation">.</span>EVENT_MBUTTONDOWN<span class="token punctuation">:</span>  <span class="token comment"># 中键绘制轮廓</span>
    mask <span class="token operator">=</span> np<span class="token punctuation">.</span>zeros<span class="token punctuation">(</span>img<span class="token punctuation">.</span>shape<span class="token punctuation">,</span> np<span class="token punctuation">.</span>uint8<span class="token punctuation">)</span>
    points <span class="token operator">=</span> np<span class="token punctuation">.</span>array<span class="token punctuation">(</span>pts<span class="token punctuation">,</span> np<span class="token punctuation">.</span>int32<span class="token punctuation">)</span>
    points <span class="token operator">=</span> points<span class="token punctuation">.</span>reshape<span class="token punctuation">(</span><span class="token punctuation">(</span><span class="token operator">-</span><span class="token number">1</span><span class="token punctuation">,</span> <span class="token number">1</span><span class="token punctuation">,</span> <span class="token number">2</span><span class="token punctuation">)</span><span class="token punctuation">)</span>

    <span class="token comment"># 画多边形</span>
    mask <span class="token operator">=</span> cv2<span class="token punctuation">.</span>polylines<span class="token punctuation">(</span>mask<span class="token punctuation">,</span> <span class="token punctuation">[</span>points<span class="token punctuation">]</span><span class="token punctuation">,</span> <span class="token boolean">True</span><span class="token punctuation">,</span> <span class="token punctuation">(</span><span class="token number">255</span><span class="token punctuation">,</span> <span class="token number">255</span><span class="token punctuation">,</span> <span class="token number">255</span><span class="token punctuation">)</span><span class="token punctuation">,</span> <span class="token number">2</span><span class="token punctuation">)</span>
    mask2 <span class="token operator">=</span> cv2<span class="token punctuation">.</span>fillPoly<span class="token punctuation">(</span>mask<span class="token punctuation">.</span>copy<span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">,</span> <span class="token punctuation">[</span>points<span class="token punctuation">]</span><span class="token punctuation">,</span> <span class="token punctuation">(</span><span class="token number">255</span><span class="token punctuation">,</span> <span class="token number">255</span><span class="token punctuation">,</span> <span class="token number">255</span><span class="token punctuation">)</span><span class="token punctuation">)</span>  <span class="token comment"># 用于求 ROI</span>
    mask3 <span class="token operator">=</span> cv2<span class="token punctuation">.</span>fillPoly<span class="token punctuation">(</span>mask<span class="token punctuation">.</span>copy<span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">,</span> <span class="token punctuation">[</span>points<span class="token punctuation">]</span><span class="token punctuation">,</span> <span class="token punctuation">(</span><span class="token number">0</span><span class="token punctuation">,</span> <span class="token number">255</span><span class="token punctuation">,</span> <span class="token number">0</span><span class="token punctuation">)</span><span class="token punctuation">)</span>      <span class="token comment"># 用于 显示在桌面的图像</span>
    show_image <span class="token operator">=</span> cv2<span class="token punctuation">.</span>addWeighted<span class="token punctuation">(</span>src1<span class="token operator">=</span>img<span class="token punctuation">,</span> alpha<span class="token operator">=</span><span class="token number">0.8</span><span class="token punctuation">,</span> src2<span class="token operator">=</span>mask3<span class="token punctuation">,</span> beta<span class="token operator">=</span><span class="token number">0.2</span><span class="token punctuation">,</span> gamma<span class="token operator">=</span><span class="token number">0</span><span class="token punctuation">)</span>

    cv2<span class="token punctuation">.</span>imshow<span class="token punctuation">(</span><span class="token string">"mask"</span><span class="token punctuation">,</span> mask2<span class="token punctuation">)</span>
    cv2<span class="token punctuation">.</span>imshow<span class="token punctuation">(</span><span class="token string">"show_img"</span><span class="token punctuation">,</span> show_image<span class="token punctuation">)</span>

    ROI <span class="token operator">=</span> cv2<span class="token punctuation">.</span>bitwise_and<span class="token punctuation">(</span>mask2<span class="token punctuation">,</span> img<span class="token punctuation">)</span>
    cv2<span class="token punctuation">.</span>imshow<span class="token punctuation">(</span><span class="token string">"ROI"</span><span class="token punctuation">,</span> ROI<span class="token punctuation">)</span>
    cv2<span class="token punctuation">.</span>waitKey<span class="token punctuation">(</span><span class="token number">0</span><span class="token punctuation">)</span>

<span class="token keyword">if</span> <span class="token builtin">len</span><span class="token punctuation">(</span>pts<span class="token punctuation">)</span> <span class="token operator">&gt;</span> <span class="token number">0</span><span class="token punctuation">:</span>
    <span class="token comment"># 将pts中的最后一点画出来</span>
    cv2<span class="token punctuation">.</span>circle<span class="token punctuation">(</span>img2<span class="token punctuation">,</span> pts<span class="token punctuation">[</span><span class="token operator">-</span><span class="token number">1</span><span class="token punctuation">]</span><span class="token punctuation">,</span> <span class="token number">3</span><span class="token punctuation">,</span> <span class="token punctuation">(</span><span class="token number">0</span><span class="token punctuation">,</span> <span class="token number">0</span><span class="token punctuation">,</span> <span class="token number">255</span><span class="token punctuation">)</span><span class="token punctuation">,</span> <span class="token operator">-</span><span class="token number">1</span><span class="token punctuation">)</span>

<span class="token keyword">if</span> <span class="token builtin">len</span><span class="token punctuation">(</span>pts<span class="token punctuation">)</span> <span class="token operator">&gt;</span> <span class="token number">1</span><span class="token punctuation">:</span>
    <span class="token comment"># 画线</span>
    <span class="token keyword">for</span> i <span class="token keyword">in</span> <span class="token builtin">range</span><span class="token punctuation">(</span><span class="token builtin">len</span><span class="token punctuation">(</span>pts<span class="token punctuation">)</span> <span class="token operator">-</span> <span class="token number">1</span><span class="token punctuation">)</span><span class="token punctuation">:</span>
        cv2<span class="token punctuation">.</span>circle<span class="token punctuation">(</span>img2<span class="token punctuation">,</span> pts<span class="token punctuation">[</span>i<span class="token punctuation">]</span><span class="token punctuation">,</span> <span class="token number">5</span><span class="token punctuation">,</span> <span class="token punctuation">(</span><span class="token number">0</span><span class="token punctuation">,</span> <span class="token number">0</span><span class="token punctuation">,</span> <span class="token number">255</span><span class="token punctuation">)</span><span class="token punctuation">,</span> <span class="token operator">-</span><span class="token number">1</span><span class="token punctuation">)</span>  <span class="token comment"># x ,y 为鼠标点击地方的坐标</span>
        cv2<span class="token punctuation">.</span>line<span class="token punctuation">(</span>img<span class="token operator">=</span>img2<span class="token punctuation">,</span> pt1<span class="token operator">=</span>pts<span class="token punctuation">[</span>i<span class="token punctuation">]</span><span class="token punctuation">,</span> pt2<span class="token operator">=</span>pts<span class="token punctuation">[</span>i <span class="token operator">+</span> <span class="token number">1</span><span class="token punctuation">]</span><span class="token punctuation">,</span> color<span class="token operator">=</span><span class="token punctuation">(</span><span class="token number">255</span><span class="token punctuation">,</span> <span class="token number">0</span><span class="token punctuation">,</span> <span class="token number">0</span><span class="token punctuation">)</span><span class="token punctuation">,</span> thickness<span class="token operator">=</span><span class="token number">2</span><span class="token punctuation">)</span>

cv2<span class="token punctuation">.</span>imshow<span class="token punctuation">(</span><span class="token string">'image'</span><span class="token punctuation">,</span> img2<span class="token punctuation">)</span>

# 创建图像与窗口并将窗口与回调函数绑定
img = cv2.imread(“D:\python_script\ffff\qipan.png”)
cv2.namedWindow(‘image’)
cv2.setMouseCallback(‘image’, draw_roi)
print("[INFO] 单击左键：选择点，单击右键：删除上一次选择的点，单击中键：确定ROI区域")
print("[INFO] 按‘S’确定选择区域并保存")
print("[INFO] 按 ESC 退出")

while True:
key = cv2.waitKey(1) & 0xFF
if key 27:
break
if key ord(“s”):
saved_data = {“ROI”: pts}
joblib.dump(value=saved_data, filename=“config.pkl”)
print("[INFO] ROI坐标已保存到本地.")
break
cv2.destroyAllWindows()

读取获取的ROI区域

def Load_Model(filepath):
    img = cv2.imread("D:\\python_script\\ffff\\qipan.png")
    model = joblib.load(filepath)
    print(type(model))
    print(model)
    return model

Load_Model(‘config.pkl’)

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OpenCV-Python 选择ROI

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OpenCV-Python 选择ROI

OpenCV-Python选择ROI

1. 矩形ROI，直接使用切片，简单粗暴

2. 使用OpenCV中的一些函数获取ROI区域，这个用的最多

3. 使用鼠标获取ROI区域

4. 鼠标获取多边形ROI

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