1.python实时调取本地摄像头
- import numpy as np
- import cv2
- cap = cv2.VideoCapture(0) #参数为0时调用本地摄像头;url连接调取网络摄像头;文件地址获取本地视频
- while(True):
- ret,frame=cap.read()
-
- #灰度化
- gray=cv2.cvtColor(frame,cv2.COLOR_BGR2GRAY)
- cv2.imshow('frame',gray)
-
- #普通图片
- cv2.imshow('frame',frame)
-
- if cv2.waitKey(1)&0xFF==ord('q'):
- break
- cap.release()
- cv2.destroyAllWindows()
2.opencv代码
- # -*- coding: utf-8 -*-
- """
- Spyder Editor
-
- This is a temporary script file.
- """
-
- #设置工作路径
- import os
- os.chdir('E:\\0yfl\\SH-spyder-workspace\\')
- os.path.abspath('.')
-
-
- import numpy as np
- import cv2
-
- #1.1读取图片imread;展示图片imshow;导出图片imwrite
- #只是灰度图片
- img=cv2.imread('Myhero.jpg',cv2.IMREAD_GRAYSCALE)
- #彩色图片
- img=cv2.imread('Myhero.jpg',cv2.IMREAD_COLOR)
- #彩色以及带有透明度
- img=cv2.imread('Myhero.jpg',cv2.IMREAD_UNCHANGED)
- print(img)
- #设置窗口可自动调节大小
- cv2.namedWindow('image',cv2.WINDOW_NORMAL)
- cv2.imshow('image',img)
- k=cv2.waitKey(0)
- #如果输入esc
- if k==27:
- #exit
- cv2.destroyAllWindows
- #如果输入s
- elif k==ord('s'):
- #save picture and exit
- cv2.imwrite('Myhero_out.png',img)
- cv2.destroyAllWindows()
-
-
- #1.2视频读取
- #打开内置摄像头
- cap=cv2.VideoCapture(0)
- #打开视频
- cap=cv2.VideoCapture('why.mp4')
- #或者视频每秒多少帧的数据
- fps=cap.get(5)
- i=0
- while(True):
- #读取一帧
- ret,frame=cap.read()
- #转化为灰图
- gray=cv2.cvtColor(frame,cv2.COLOR_BGR2GRAY)
- #设置导出文件名编号
- ii = i + 1
- #每1s导出一张
- if i/fps==int(i/fps):
- #导出文件名为why+编号+.png
- #若想要导出灰图,则将下面frame改为gray即可
- cv2.imwrite("why"+str(int(i/fps))+".png",frame)
- #读完之后结束退出
- if cv2.waitKey(1)==ord('q'):
- break
-
- cap.release()
- cv2.destoryAllWindows()
-
-
- #1.3图像像素修改
- rangexmin=100
- rangexmax=120
- rangeymin=90
- rangeymax=100
- img=cv2.imread('Myhero.jpg',0)
- img[rangexmin:rangexmax,rangeymin:rangeymax]=[[255]*(rangeymax-rangeymin)]*(rangexmax-rangexmin)
- cv2.imwrite('Myhero_out2.png',img)
-
- #拆分以及合并图像通道1
- b,g,r=cv2.split(img)
- img=cv2.merge(b,g,r)
-
- #png转eps,不过非常模糊
- from matplotlib import pyplot as plt
- img=cv2.imread('wechat1.png',cv2.IMREAD_COLOR)
- plt.imsave('wechat_out.eps',img)
-
- #图像按比例混合
- img1=cv2.imread('Myhero.jpg',cv2.IMREAD_COLOR)
- img2=cv2.imread('Myhero_out.png',cv2.IMREAD_COLOR)
- dst=cv2.addWeighted(img1,0.5,img2,0.5,0)
- cv2.imwrite("Myhero_combi.jpg",dst)
-
-
- #1.4按位运算
- #加载图像
- img1=cv2.imread("Myhero.jpg")
- img2=cv2.imread("why1.png")
- #后面那张图更大
- rows,cols,channels=img1.shape
- ROI=img2[0:rows,0:cols]
- #做一个ROI为图像的大小
- img2gray=cv2.cvtColor(img1,cv2.COLOR_BGR2GRAY)
- #小于175的改为0,大于175的赋值为255
- ret,mask=cv2.threshold(img2gray,175,255,cv2.THRESH_BINARY)
- cv2.imwrite("Myhero_mask.jpg",mask)
- #255-mask=mask_inv
- mask_inv=cv2.bitwise_not(mask)
- cv2.imwrite("Myhero_mask_inv.jpg",mask_inv)
- #在mask白色区域显示成ROI,背景图片
- img2_bg=cv2.bitwise_and(ROI,ROI,maskmask=mask)
- cv2.imwrite("Myhero_pic2_backgroud.jpg",img2_bg)
- #除了mask以外的区域都显示成img1,前景图片
- img1_fg=cv2.bitwise_and(img1,img1,mask=mask_inv)
- cv2.imwrite("Myhero_pic2_frontgroud.jpg",img1_fg)
- #前景图片加上背景图片
- dst = cv2.add(img2_bg,img1_fg)
- img2[0:rows, 0:cols ] = dst
- cv2.imwrite("Myhero_pic2_addgroud.jpg",dst)
- #finished
-
- #构建淹膜方法2
- #截取帧
- ret,frame=cap.read()
- #转换到HSV
- hsv=cv2.cvtColor(frame,cv2.COLOR_BGR2HSV)
- #设定蓝色的阈值
- lower_blue=np.array([110,50,50])
- upper_blue=np.array([130,255,255])
- #根据阈值构建掩模
- mask=cv2.inRange(hsv,lower_blue,upper_blue)
- #对原图像和掩模进行位运算
- res=cv2.bitwise_and(frame,frame,maskmask=mask)
-
-
- #图片放缩,用的插值方法,所以不会损害清晰度
- res=cv2.resize(img1,None,fx=2,fy=2,interpolation=cv2.INTER_CUBIC)
- cv2.imwrite("Myhero_bigger.jpg",res)
- #第二种插值方法
- height,width=img.shape[:2]
- res=cv2.resize(img,(2*width,2*height),interpolation=cv2.INTER_CUBIC)
-
- #edge现实图片中不好用,人工画的图片还可以
- img = cv2.imread('why3.png',0)
- edges = cv2.Canny(img,50,100)
- cv2.imwrite("why3_edge.png",edges)
-
- #识别轮廓,并保存轮廓点contours
- img=cv2.imread('why129.png')
- imgray=cv2.imread('why129.png',cv2.IMREAD_GRAYSCALE)
- ret,thresh = cv2.threshold(imgray,127,255,0)
- cv2.imwrite("2.jpg",thresh)
- image, contours, hierarchy = cv2.findContours(thresh,cv2.RETR_TREE,cv2.CHAIN_APPROX_SIMPLE)
- img = cv2.drawContours(img, contours, -1, (0,255,0), 3)
- cv2.imwrite("3.jpg",img)
-
-
- #轮廓
- img = cv2.imread('why3.png',0)
- ret,thresh = cv2.threshold(img,127,255,0)
- contours,hierarchy = cv2.findContours(thresh, 1, 2)
- cnt = contours[0]
- #近似轮廓
- epsilon = 0.1*cv2.arcLength(cnt,True)
- approx = cv2.approxPolyDP(cnt,epsilon,True)
-
- img = cv2.drawContours(img, approx, -1, (0,255,0), 3)
- cv2.imwrite("4.jpg",img)
-
- from matplotlib import pyplot as plt
- #图像识别/匹配
- img_rgb = cv2.imread('why174.png')
- img_gray = cv2.cvtColor(img_rgb, cv2.COLOR_BGR2GRAY)
- img2=img_gray.copy()
- template = cv2.imread('0temp.png',0)
- w, h = template.shape[::-1]
- #共有六种识别方法
- methods = ['cv2.TM_CCOEFF', 'cv2.TM_CCOEFF_NORMED', 'cv2.TM_CCORR', 'cv2.TM_CCORR_NORMED', 'cv2.TM_SQDIFF', 'cv2.TM_SQDIFF_NORMED']
-
- for meth in methods:
- img = img2.copy()
- #eval返回某个式子的计算结果
- method = eval(meth)
- #下面使用匹配方法
- res = cv2.matchTemplate(img,template,method)
- min_val, max_val, min_loc, max_loc = cv2.minMaxLoc(res)
- if method in [cv2.TM_SQDIFF, cv2.TM_SQDIFF_NORMED]:
- top_left = min_loc
- else:
- top_left = max_loc
- bottom_right = (top_left[0] + w, top_left[1] + h)
- #画矩形把他框出来
- cv2.rectangle(img,top_left, bottom_right, 255, 2)
-
- plt.subplot(121),plt.imshow(res,cmap = 'gray')
- plt.title('Matching Result'), plt.xticks([]), plt.yticks([])
- plt.subplot(122),plt.imshow(img,cmap = 'gray')
- plt.title('Detected Point'), plt.xticks([]), plt.yticks([])
- plt.suptitle(meth)
-
- plt.show()
-
- #这个匹配结果太差
- #选取3,5,6的匹配方式会稍微好点:cv2.TM_CCORR;cv2.TM_SQDIFF,cv2.TM_SQDIFF_NORMED
-
- #视频人脸识别
- #https://blog.csdn.net/wsywb111/article/details/79152425
- import cv2
- from PIL import Image
- cap=cv2.VideoCapture("why.mp4")
- #告诉Opencv使用人脸识别分类器
- classfier=cv2.CascadeClassifier("E:\\0yfl\\opencv-master\\data\\haarcascades\\haarcascade_frontalface_alt2.xml")
- count=0
- while cap.isOpened():
- ret,frame=cap.read()
- if not ret:
- break
- grey=cv2.cvtColor(frame,cv2.COLOR_BGR2GRAY)
- faceRect=classfier.detectMultiScale(grey,scaleFactor=1.2, minNeighbors=3, minSize=(32, 32))
- if len(faceRect)>0:
- countcount=count+1
- print(count)
-
-
- #137这种程度可以识别,111没有成功识别,大概是侧脸的缘故
- #截出人脸
- image_name="why111.png"
- frame=cv2.imread(image_name,0)
- if not (frame is None):
- #导入测试集
- classfier=cv2.CascadeClassifier("E:\\0yfl\\opencv-master\\data\\haarcascades\\haarcascade_frontalface_alt2.xml")
- #使用测试集导出人脸的位置,存在faceRect中,可以检测多张人脸
- faceRect=classfier.detectMultiScale(frame,scaleFactor=3.0, minNeighbors=3, minSize=(32, 32))
- count=0
- for (x1,y1,w,h) in faceRect:
- countcount=count+1
- #截取上述图片的人脸部分并保存每一张识别出的人脸
- Image.open(image_name).crop((x1,y1,x1+w,y1+h)).save(image_name.split(".")[0]+"_face_"+str(count)+".png")
- if count==0:
- print ("No face detected!")
- else:
- print ("Picture "+ image_name +" is not exist in "+os.path.abspath("."))
- #人脸上画出矩形
- from PIL import Image,ImageDraw
- image_name="why111.png"
- frame=cv2.imread(image_name,0)
- if not (frame is None):
- classfier=cv2.CascadeClassifier("E:\\0yfl\\opencv-master\\data\\haarcascades\\haarcascade_frontalface_alt2.xml")
- faceRect=classfier.detectMultiScale(frame,scaleFactor=3.0, minNeighbors=3, minSize=(32, 32))
- #画框框
- img = Image.open(image_name)
- draw_instance = ImageDraw.Draw(img)
- count=0
- for (x1,y1,w,h) in faceRect:
- draw_instance.rectangle((x1,y1,x1+w,y1+h), outline=(255, 0,0))
- img.save('drawfaces_'+image_name)
- countcount=count+1
- if count==0:
- print ("No face detected!")
- else:
- print ("Picture "+ image_name +" is not exist in "+os.path.abspath("."))
-
-
- #detectFaces()返回图像中所有人脸的矩形坐标(矩形左上、右下顶点)
- #使用haar特征的级联分类器haarcascade_frontalface_default.xml,在haarcascades目录下还有其他的训练好的xml文件可供选择。
- #注:haarcascades目录下训练好的分类器必须以灰度图作为输入。
-
-
- from PIL import Image,ImageDraw
- image_name="why63.png"
- frame=cv2.imread(image_name,0)
- if not (frame is None):
- classfier=cv2.CascadeClassifier("E:\\0yfl\\opencv-master\\data\\haarcascades\\haarcascade_fullbody.xml")
- faceRect=classfier.detectMultiScale(frame,scaleFactor=3.0, minNeighbors=3, minSize=(32, 32))
- #画框框
- img = Image.open(image_name)
- draw_instance = ImageDraw.Draw(img)
- count=0
- for (x1,y1,w,h) in faceRect:
- draw_instance.rectangle((x1,y1,x1+w,y1+h), outline=(255, 0,0))
- img.save('drawfaces_'+image_name)
- countcount=count+1
- if count==0:
- print ("No face detected!")
- else:
- print ("Picture "+ image_name +" is not exist in "+os.path.abspath("."))
(StarZhai) |