目录 1.效果展示 2.项目准备 3.代码的讲解与展示 4.项目资源 5.项目总结与评价 1.效果展示 网络摄像头扫描: 图片扫描: 最终扫描保存的图片: (视频) (图片) 2.项目准备 今天的项
目录
- 1.效果展示
- 2.项目准备
- 3.代码的讲解与展示
- 4.项目资源
- 5.项目总结与评价
1.效果展示
网络摄像头扫描:
图片扫描:
最终扫描保存的图片:
(视频)
(图片)
2.项目准备
今天的项目文件只需要两个.py文件,其中一个.py文件是已经写好的函数,你将直接使用它,我不会在此多做讲解,因为我们将会在主要的.py文件import 导入它,如果想了解其中函数是如何写的,请自行学习。
utlis.py,需要添加的.py文件
import cv2 import numpy as np # TO STACK ALL THE IMAGES IN ONE WINDOW def stackImages(imgArray,scale,lables=[]): rows = len(imgArray) cols = len(imgArray[0]) rowsAvailable = isinstance(imgArray[0], list) width = imgArray[0][0].shape[1] height = imgArray[0][0].shape[0] if rowsAvailable: for x in range ( 0, rows): for y in range(0, cols): imgArray[x][y] = cv2.resize(imgArray[x][y], (0, 0), None, scale, scale) if len(imgArray[x][y].shape) == 2: imgArray[x][y]= cv2.cvtColor( imgArray[x][y], cv2.COLOR_GRAY2BGR) imageBlank = np.zeros((height, width, 3), np.uint8) hor = [imageBlank]*rows hor_con = [imageBlank]*rows for x in range(0, rows): hor[x] = np.hstack(imgArray[x]) hor_con[x] = np.concatenate(imgArray[x]) ver = np.vstack(hor) ver_con = np.concatenate(hor) else: for x in range(0, rows): imgArray[x] = cv2.resize(imgArray[x], (0, 0), None, scale, scale) if len(imgArray[x].shape) == 2: imgArray[x] = cv2.cvtColor(imgArray[x], cv2.COLOR_GRAY2BGR) hor= np.hstack(imgArray) hor_con= np.concatenate(imgArray) ver = hor if len(lables) != 0: eachImgWidth= int(ver.shape[1] / cols) eachImgHeight = int(ver.shape[0] / rows) print(eachImgHeight) for d in range(0, rows): for c in range (0,cols): cv2.rectangle(ver,(c*eachImgWidth,eachImgHeight*d),(c*eachImgWidth+len(lables[d][c])*13+27,30+eachImgHeight*d),(255,255,255),cv2.FILLED) cv2.putText(ver,lables[d][c],(eachImgWidth*c+10,eachImgHeight*d+20),cv2.FONT_HERSHEY_COMPLEX,0.7,(255,0,255),2) return ver def reorder(myPoints): myPoints = myPoints.reshape((4, 2)) myPointsNew = np.zeros((4, 1, 2), dtype=np.int32) add = myPoints.sum(1) myPointsNew[0] = myPoints[np.argmin(add)] myPointsNew[3] =myPoints[np.argmax(add)] diff = np.diff(myPoints, axis=1) myPointsNew[1] =myPoints[np.argmin(diff)] myPointsNew[2] = myPoints[np.argmax(diff)] return myPointsNew def biggestContour(contours): biggest = np.array([]) max_area = 0 for i in contours: area = cv2.contourArea(i) if area > 5000: peri = cv2.arcLength(i, True) approx = cv2.approxPolyDP(i, 0.02 * peri, True) if area > max_area and len(approx) == 4: biggest = approx max_area = area return biggest,max_area def drawRectangle(img,biggest,thickness): cv2.line(img, (biggest[0][0][0], biggest[0][0][1]), (biggest[1][0][0], biggest[1][0][1]), (0, 255, 0), thickness) cv2.line(img, (biggest[0][0][0], biggest[0][0][1]), (biggest[2][0][0], biggest[2][0][1]), (0, 255, 0), thickness) cv2.line(img, (biggest[3][0][0], biggest[3][0][1]), (biggest[2][0][0], biggest[2][0][1]), (0, 255, 0), thickness) cv2.line(img, (biggest[3][0][0], biggest[3][0][1]), (biggest[1][0][0], biggest[1][0][1]), (0, 255, 0), thickness) return img def nothing(x): pass def initializeTrackbars(intialTracbarVals=0): cv2.namedWindow("Trackbars") cv2.resizeWindow("Trackbars", 360, 240) cv2.createTrackbar("Threshold1", "Trackbars", 200,255, nothing) cv2.createTrackbar("Threshold2", "Trackbars", 200, 255, nothing) def valTrackbars(): Threshold1 = cv2.getTrackbarPos("Threshold1", "Trackbars") Threshold2 = cv2.getTrackbarPos("Threshold2", "Trackbars") src = Threshold1,Threshold2 return src
3.代码的讲解与展示
import cv2 import numpy as np import utlis ######################################################################## webCamFeed = True # pathImage = "1.jpg" # cap = cv2.VideoCapture(1) # cap.set(10,160) # heightImg = 640 # widthImg = 480 # ######################################################################## utlis.initializeTrackbars() count=0 while True: if webCamFeed: ret, img = cap.read() else: img = cv2.imread(pathImage) img = cv2.resize(img, (widthImg, heightImg)) imgBlank = np.zeros((heightImg,widthImg, 3), np.uint8) imgGray = cv2.cvtColor(img, cv2.COLOR_BGR2GRAY) imgBlur = cv2.GaussianBlur(imgGray, (5, 5), 1) # 添加高斯模糊 thres=utlis.valTrackbars() #获取阈值的轨迹栏值 imgThreshold = cv2.Canny(imgBlur,thres[0],thres[1]) # 应用CANNY模糊 kernel = np.ones((5, 5)) imgDial = cv2.dilate(imgThreshold, kernel, iterations=2) imgThreshold = cv2.erode(imgDial, kernel, iterations=1) # 查找所有轮廓 imgContours = img.copy() imgBigContour = img.copy() contours, hierarchy = cv2.findContours(imgThreshold, cv2.RETR_EXTERNAL, cv2.CHAIN_APPROX_SIMPLE) # FIND ALL CONTOURS cv2.drawContours(imgContours, contours, -1, (0, 255, 0), 10) # 绘制所有检测到的轮廓 # 找到最大的轮廓 biggest, maxArea = utlis.biggestContour(contours) # 找到最大的轮廓 if biggest.size != 0: biggest=utlis.reorder(biggest) cv2.drawContours(imgBigContour, biggest, -1, (0, 255, 0), 20) # 画最大的轮廓 imgBigContour = utlis.drawRectangle(imgBigContour,biggest,2) pts1 = np.float32(biggest) # 为扭曲准备点 pts2 = np.float32([[0, 0],[widthImg, 0], [0, heightImg],[widthImg, heightImg]]) # 为扭曲准备点 matrix = cv2.getPerspectiveTransform(pts1, pts2) imgWarpColored = cv2.warpPerspective(img, matrix, (widthImg, heightImg)) #从每侧移除20个像素 imgWarpColored=imgWarpColored[20:imgWarpColored.shape[0] - 20, 20:imgWarpColored.shape[1] - 20] imgWarpColored = cv2.resize(imgWarpColored,(widthImg,heightImg)) # 应用自适应阈值 imgWarpGray = cv2.cvtColor(imgWarpColored,cv2.COLOR_BGR2GRAY) imgAdaptiveThre= cv2.adaptiveThreshold(imgWarpGray, 255, 1, 1, 7, 2) imgAdaptiveThre = cv2.bitwise_not(imgAdaptiveThre) imgAdaptiveThre=cv2.medianBlur(imgAdaptiveThre,3) # 用于显示的图像阵列 imageArray = ([img,imgGray,imgThreshold,imgContours], [imgBigContour,imgWarpColored, imgWarpGray,imgAdaptiveThre]) else: imageArray = ([img,imgGray,imgThreshold,imgContours], [imgBlank, imgBlank, imgBlank, imgBlank]) # 显示标签 lables = [["Original","Gray","Threshold","Contours"], ["Biggest Contour","Warp Prespective","Warp Gray","Adaptive Threshold"]] stackedImage = utlis.stackImages(imageArray,0.75,lables) cv2.imshow("Result",stackedImage) # 按下“s”键时保存图像 if cv2.waitKey(1) & 0xFF == ord('s'): cv2.imwrite("Scanned/myImage"+str(count)+".jpg",imgWarpColored) cv2.rectangle(stackedImage, ((int(stackedImage.shape[1] / 2) - 230), int(stackedImage.shape[0] / 2) + 50), (1100, 350), (0, 255, 0), cv2.FILLED) cv2.putText(stackedImage, "Scan Saved", (int(stackedImage.shape[1] / 2) - 200, int(stackedImage.shape[0] / 2)), cv2.FONT_HERSHEY_DUPLEX, 3, (0, 0, 255), 5, cv2.LINE_AA) cv2.imshow('Result', stackedImage) cv2.waitKey(300) count += 1 elif cv2.waitKey(1) & 0xFF == 27: break
今天需要要讲解的还是主函数Main.py,由我来讲解,其实我也有点压力,因为这个项目它涉及了Opencv核心知识点,有的地方我也需要去查找,因为学久必会忘,更何况我也是刚刚起步的阶段,所以我会尽我所能的去讲清楚。
注意:我是以网络摄像头为例,读取图片的方式,同理可得。
- 首先,请看#号框内,我们将从这里开始起,设立变量webCamFeed,用其表示是否打开摄像头,接着亮度,宽,高的赋值。utlis.initializeTrackbars()是utlis.py文件当中的轨迹栏初始化函数。
- 然后,我们依次对图像进行大小调整、灰度图像、高斯模糊、Canny边缘检测、扩张、侵蚀。
- 之后,找出图像可以检测的所有轮廓,并找到最大的轮廓并且画出来,同时要为扫描到的文档找到四个顶点,也就是扭曲点,用cv2.getPerspectiveTransform()函数找到点的坐标,用cv2.warpPerspective()函数输出图像,如果到了这一步,我们去运行一下会发现有边角是桌子的颜色但并没有很多,所以我们需要从每侧移除20个像素,应用自适应阈值让图像变得较为清晰——黑色的文字更加的明显。
- 接着,配置utlis.stackImages()需要的参数——图像(列表的形式),规模,标签(列表的形式,可以不用标签,程序一样可以正确运行),展示窗口。
- 最后,如果你觉得比较满意,按下s键,即可保存,并在图中央出现有"Scan Saved"的矩形框。点击Esc键即可退出程序。
4.项目资源
GitHUb:Opencv-project-training/Opencv project training/06 Document Scanner at main · Auorui/Opencv-project-training · GitHub
5.项目总结与评价
它是一个很好的项目,要知道我们要实现这种效果,即修正文档,还得清晰,要么有VIP,兑换积分,看广告等。如果你发现扫描的文档不清晰,请修改合适的分辨率。以我个人来看,它的实用性很高。本来今天是想要做人脸识别的项目的,但后面我一直没有解决下载几个包错误的问题(现在已经解决),文档扫描是明天的项目,今天是赶着做好的,那么希望你在今天的项目中玩得开心!
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