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OpenCV-Python选择ROI
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()
- 1
- 2
- 3
- 4
- 5
- 6
- 7
- 8
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()
- 1
- 2
- 3
- 4
- 5
- 6
- 7
- 8
- 9
- 10
- 11
- 12
- 13
- 14
- 15
- 16
- 17
- 18
- 19
- 20
- 21
- 22
- 23
- 24
- 25
- 26
- 27
- 28
- 29
- 30
- 31
- 32
- 33
- 34
- 35
- 36
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()
- 1
- 2
- 3
- 4
- 5
- 6
- 7
- 8
- 9
- 10
- 11
- 12
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">></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">></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()
- 1
- 2
- 3
- 4
- 5
- 6
- 7
- 8
- 9
- 10
- 11
- 12
- 13
- 14
- 15
- 16
- 17
- 18
- 19
- 20
- 21
- 22
- 23
- 24
- 25
- 26
- 27
- 28
- 29
- 30
- 31
- 32
- 33
- 34
- 35
- 36
- 37
- 38
- 39
- 40
- 41
- 42
- 43
- 44
- 45
- 46
- 47
- 48
- 49
- 50
- 51
- 52
- 53
- 54
- 55
- 56
- 57
- 58
- 59
- 60
- 61
- 62
- 63
- 64
- 65
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’)
- 1
- 2
- 3
- 4
- 5
- 6
- 7
- 8
</div>
<link href="https://csdnimg.cn/release/phoenix/mdeditor/markdown_views-e44c3c0e64.css" rel="stylesheet">
</div>
</article>