[英]How to convert the c++ code to Python for automatic image rotation using OpenCV?
我要执行以下操作:
Incoming Image
以使其与Template Image
完美对齐。 cv2.substrate()
比较两个对齐的图像并打印出差异。 我已经有了Python代码来进行图像比较:
import cv2
import numpy as np
image1 = cv2.imread('letter f5.png')
image2 = cv2.imread('letter f.png')
difference = cv2.subtract(image1, image2)
result = np.any(difference)
if result is True:
print ("The images are the same")
else:
cv2.imshow("result.jpg", difference)
print ("the images are different")
如果两个图像对齐,则图像比较效果很好。 如果“ Incoming Image
沿顺时针方向偏移了90度,则图像比较将无法进行。
因此,如何旋转此图像:
对此:
这样我就可以将其与Template Image
进行比较。
我有这个C ++代码:
#include <stdio.h>
#include <iostream>
#include "opencv2/core/core.hpp"
#include "opencv2/features2d/features2d.hpp"
#include "opencv2/highgui/highgui.hpp"
#include "opencv2/calib3d/calib3d.hpp"
#include "opencv2/nonfree/nonfree.hpp"
#include "opencv2/imgproc/imgproc.hpp"
#define PI 3.14159265
using namespace cv;
using namespace std;
void rotate(cv::Mat& src, double angle, cv::Mat& dst)
{
int len = std::max(src.cols, src.rows);
cv::Point2f pt(len/2., len/2.);
cv::Mat r = cv::getRotationMatrix2D(pt, angle, 1.0);
cv::warpAffine(src, dst, r, cv::Size(len, len));
}
float angleBetween(const Point &v1, const Point &v2)
{
float len1 = sqrt(v1.x * v1.x + v1.y * v1.y);
float len2 = sqrt(v2.x * v2.x + v2.y * v2.y);
float dot = v1.x * v2.x + v1.y * v2.y;
float a = dot / (len1 * len2);
if (a >= 1.0)
return 0.0;
else if (a <= -1.0)
return PI;
else{
int degree;
degree = acos(a)*180/PI;
return degree;
};
}
int main()
{
Mat char1 = imread( "/Users/Rodrane/Documents/XCODE/OpenCV/mkedenemeleri/anarev/rotated.jpg",CV_LOAD_IMAGE_GRAYSCALE );
Mat image = imread("/Users/Rodrane/Documents/XCODE/OpenCV/mkedenemeleri/anarev/gain2000_crop.jpg", CV_LOAD_IMAGE_GRAYSCALE );
if( !char1.data )
{
std::cout<< "Error reading object " << std::endl;
return -1;
}
GaussianBlur( char1, char1, Size(3, 3), 2, 2 );
GaussianBlur( image, image, Size(3, 3), 2, 2 );
adaptiveThreshold(char1,char1,255,CV_ADAPTIVE_THRESH_MEAN_C,CV_THRESH_BINARY,9,14);
adaptiveThreshold(image,image,255,CV_ADAPTIVE_THRESH_MEAN_C,CV_THRESH_BINARY,9,14);
//Detect the keypoints using SURF Detector
int minHessian = 200;
SurfFeatureDetector detector( minHessian );
std::vector<KeyPoint> kp_object;
detector.detect( char1, kp_object );
//Calculate descriptors (feature vectors)
SurfDescriptorExtractor extractor;
Mat des_object;
extractor.compute( char1, kp_object, des_object );
FlannBasedMatcher matcher;
namedWindow("Good Matches");
std::vector<Point2f> obj_corners(4);
//Get the corners from the object
obj_corners[0] = cvPoint(0,0);
obj_corners[1] = cvPoint( char1.cols, 0 );
obj_corners[2] = cvPoint( char1.cols, char1.rows );
obj_corners[3] = cvPoint( 0, char1.rows );
Mat frame;
Mat des_image, img_matches;
std::vector<KeyPoint> kp_image;
std::vector<vector<DMatch > > matches;
std::vector<DMatch > good_matches;
std::vector<Point2f> obj;
std::vector<Point2f> scene;
std::vector<Point2f> scene_corners(4);
Mat H;
detector.detect( image, kp_image );
extractor.compute( image, kp_image, des_image );
matcher.knnMatch(des_object, des_image, matches, 2);
for(int i = 0; i < min(des_image.rows-1,(int) matches.size()); i++) //THIS LOOP IS SENSITIVE TO SEGFAULTS
{
if((matches[i][0].distance < 0.6*(matches[i][1].distance)) && ((int) matches[i].size()<=2 && (int) matches[i].size()>0))
{
good_matches.push_back(matches[i][0]);
}
}
//Draw only "good" matches
drawMatches( char1, kp_object, image, kp_image, good_matches, img_matches, Scalar::all(-1), Scalar::all(-1), vector<char>(), DrawMatchesFlags::NOT_DRAW_SINGLE_POINTS );
if (good_matches.size() >= 4)
{
for( int i = 0; i < good_matches.size(); i++ )
{
//Get the keypoints from the good matches
obj.push_back( kp_object[ good_matches[i].queryIdx ].pt );
scene.push_back( kp_image[ good_matches[i].trainIdx ].pt );
cout<<angleBetween(obj[i],scene[i])<<endl; //angles between images
}
H = findHomography( obj, scene, CV_RANSAC );
perspectiveTransform( obj_corners, scene_corners, H);
// cout<<angleBetween(obj[0], scene[0])<<endl;
//Draw lines between the corners (the mapped object in the scene image )
}
//Show detected matches
// resize(img_matches, img_matches, Size(img_matches.cols/2, img_matches.rows/2));
imshow( "Good Matches", img_matches );
waitKey();
return 0;
}
如何自动旋转传入图像,使其与模板图像完美对齐。 我有以下代码,可以手动将传入图片逆时针旋转90度
import numpy as np
import cv2
img = cv2.imread('letter defect f90.png',0)
rows,cols = img.shape
M = cv2.getRotationMatrix2D((cols/2,rows/2),90,1)
dst = cv2.warpAffine(img,M,(cols,rows))
img2 = cv2.imwrite('result_rotate.png',dst)
img3 = cv2.imread('letter f.png')
img4 = cv2.imread('result_rotate.png')
difference = cv2.subtract(img3, img4)
result = np.any(difference)
if result is True:
print ("The images are the same")
else:
cv2.imshow("result.jpg", difference)
print ("the images are different")
得到您的评论后,我正在考虑提出解决方案。 我的回答可能并不完美,但希望它能为更好的解决方案提供一些参考。
对要旋转的图像执行轮廓操作。 在获得的轮廓周围拟合一个椭圆。 现在,基于获得的椭圆,您可以得出结论,图像是垂直的,水平的还是在任何其他方向上都是倾斜的。
-如果轮廓对象较宽,则椭圆拟合的主轴将为水平。
-如果轮廓对象又细又高,则椭圆拟合的主轴将是垂直的。
现在,如果获得的椭圆拟合既不是垂直的也不是水平的,则需要执行方向对齐。
希望能帮助到你!!!!
编辑
我想您想旋转图像。 您可以使用OpenCV库中可用的getRotationMatrix2D()函数( 此处的摘录):
(x, y) = img.shape[:2]
center = (y / 2, x / 2)
Mat = cv2.getRotationMatrix2D(center, 90, 1.0)
rotate = cv2.warpAffine(img, Mat, (y, x))
cv2.imwrite("rotated.jpg", rotate)
这是您的原始图片:
这是获得的旋转图像:
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