项目创意（增强现实 - 二维码扫描仪）

项目理念：一个基于扫描和检测二维码的项目，并包含用于优化二维码检测的姿势估计，并在其上虚拟显示金字塔并存储从二维码读取的数据。

二维码——快速响应码——二维码使用四种标准化的编码模式（数字、字母数字和字节/二进制）来有效地存储数据；也可以使用扩展。

如何安装
->安装Python （2.7或3.0或更高版本）
-> 为 Ubuntu 安装 OpenCV 库
-> 为 ubuntu 安装 zbar、numpy、PIL 库
->将代码复制粘贴到编辑器中，保存为qrcode.py

运行代码：
-> 打开终端并运行以下命令
-> Python qrcode.py

import zbar
from PIL import Image,ImageColor
import cv2
import numpy as np
  
cv2.namedWindow("Python Qr-Code Detection")
cap = cv2.VideoCapture(0)
  
scanner = zbar.ImageScanner()
scanner.parse_config('enable')
  
while True:
        ret, im = cap.read()
        if not ret:
          continue 
    # Read Image
    #im = cv2.imread("sahilkhosla.jpg");
    size = im.shape
    gray = cv2.cvtColor(im, cv2.COLOR_BGR2GRAY, dstCn=0)
        pil = Image.fromarray(gray)
        width, height = pil.size
        raw = pil.tobytes()
        image = zbar.Image(width, height, 'Y800', raw)
        scanner.scan(image)
  
    for symbol in image:
            print 'decoded', symbol.type, 'symbol', '"%s"' % symbol.data
        topLeftCorners, bottomLeftCorners, bottomRightCorners, topRightCorners = [item for item in symbol.location]
            cv2.line(im, topLeftCorners, topRightCorners, (255,0,0),2)
                cv2.line(im, topLeftCorners, bottomLeftCorners, (255,0,0),2)
            cv2.line(im, topRightCorners, bottomRightCorners, (255,0,0),2)
            cv2.line(im, bottomLeftCorners, bottomRightCorners, (255,0,0),2)
  
        #2D image points. If you change the image, you need to change vector
                  
        image_points = np.array([
                            (int((topLeftCorners[0]+topRightCorners[0])/2), int((topLeftCorners[1]+bottomLeftCorners[1])/2)),     # Nose
                            topLeftCorners,     # Left eye left corner
                            topRightCorners,     # Right eye right corne
                            bottomLeftCorners,     # Left Mouth corner
                            bottomRightCorners      # Right mouth corner
                        ], dtype="double")
           
        # 3D model points.
        model_points = np.array([
                            (0.0, 0.0, 0.0),             # Nose
                            (-225.0, 170.0, -135.0),     # Left eye left corner
                            (225.0, 170.0, -135.0),      # Right eye right corne
                            (-150.0, -150.0, -125.0),    # Left Mouth corner
                            (150.0, -150.0, -125.0)      # Right mouth corner
                           
                        ])
           
           
        # Camera internals
           
        focal_length = size[1]
        center = (size[1]/2, size[0]/2)
        camera_matrix = np.array(
                         [[focal_length, 0, center[0]],
                         [0, focal_length, center[1]],
                         [0, 0, 1]], dtype = "double"
                         )
           
        print "Camera Matrix :\n {0}".format(camera_matrix)
           
        dist_coeffs = np.zeros((4,1)) # Assuming no lens distortion
        (success, rotation_vector, translation_vector) = cv2.solvePnP(model_points, image_points, camera_matrix, dist_coeffs, flags=cv2.CV_ITERATIVE)
           
        print "Rotation Vector:\n {0}".format(rotation_vector)
        print "Translation Vector:\n {0}".format(translation_vector)
           
           
        # Project a 3D point (0, 0, 1000.0) onto the image plane.
        # We use this to draw a line sticking out of the nose
           
           
        (nose_end_point2D, jacobian) = cv2.projectPoints(np.array([(0.0, 0.0, 100.0)]), rotation_vector, translation_vector, camera_matrix, dist_coeffs)
           
        for p in image_points:
            cv2.circle(im, (int(p[0]), int(p[1])), 3, (0,0,255), -1)
           
           
        p1 = ( int(image_points[0][0]), int(image_points[0][1]))
        p2 = ( int(nose_end_point2D[0][0][0]), int(nose_end_point2D[0][0][1]))
          
                #pillars 
        cv2.line(im, bottomLeftCorners, p2, (255,0,0), 2)
        cv2.line(im, topLeftCorners, p2, (255,0,0), 2)
        cv2.line(im, bottomRightCorners, p2, (255,0,0), 2)
        cv2.line(im, topRightCorners, p2, (255,0,0), 2)
           
        # Display image
    cv2.imshow("Output", im)
      
    # Wait for the magic key
        keypress = cv2.waitKey(1) & 0xFF
        if keypress == ord('q'):
        break
  
cv2.waitKey(0)

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