NI-Vision的亚像素精度(Subpixel Accuracy) 问题: Vision Development Module中的许多处理VI的输出都具有亚像素精度,这是什么意思呢? 解答:许多图像处理VI都用到了边沿检测(Edge Detection)作为复杂计算的基础,因此这篇文档将主要针对边沿检测来解释亚像素精度。几乎所有的图像处理算法都是对图像(可以认为是一个大的数...
Edge detection operator return subpixel level edge position. Using Canny filter as differential operator. Implementing according toCarsten Steger's method. Interpolation of second partial derivatives withFacet Model method. API structContour{std::vector<cv::Point2f> points;// edge locationstd::vector<...
$ git clone https://github.com/raymondngiam/subpixel-edge-contour-in-opencv.git $ cd subpixel-edge-contour-in-opencv $ mkdir build && cd build $ cmake .. $ make $ ./main Code Walkthrough Pixel-precise edge contour extraction A typical workflow for edge detection in OpenCV starts with ...
SubPixelEdgeDetect 使用OPENCV编写的亚像素边缘提取,其中包括运行所需库,及测试数据;可直接运行。-Written using OPENCV subpixel edge detection, including run
size(); i++) { // Open the image image = cv::imread(filelist[i],0); // Get the chessboard corners bool found = cv::findChessboardCorners( image, boardSize, imageCorners); // Get subpixel accuracy on the corners cv::cornerSubPix(image, imageCorners, cv::Size(5,5), cv::Size(...
"Harris Corner Detection”背后的思想 函数:cv2.cornerHarris(),cv.2cornerSubPix() 理论 在上一章中看到,角是图像中各个方向上强度变化很大的区域。Chris Harris和Mike Stephens在1988年的论文《 A Combined Corner and Edge Detector 》中做了一次找到这些角点的早期尝试,所以现在将该方法称为哈里斯角点检测器。
1 #include <opencv2/opencv.hpp> 2 #include <iostream> 3 4 using namespace cv; 5 using namespace std; 6 7 Mat src,src_gray; 8 9 int max_corners = 20; 10 int max_count = 50; 11 12 const char* output_title = "SubPix Result"; 13 14 void SubPixel_demo(int,void*); 15 16...
因此,Harris Corner Detection的结果是具有这些值的灰度图像。合适的阈值可作为提供图像的角点。我们将用一个简单的图像来做到这一点。 下面就是怎么使用cv.cornerHarris的例子。不做翻译。 Corner with SubPixel Accuracy Sometimes, you may need to find the corners with maximum accuracy. OpenCV comes with a fu...
// minimum number of votes that a line // must receive before being considered int minVote; // min length for a line double minLength; // max allowed gap along the line double maxGap; public: // Default accumulator resolution is 1 pixel by 1 degree // no gap, no mimimum length Line...
然后有些VI 具有输入端,可以允许用户指定亚像素精度(Subpixel Accuracy) 。以 IMAQ Edge Tool VI为例,有个输入 10、参数是 Subpixel Information ,这是一个包含 Interpolation Type( 插值类型 )和 SubpixelAccuracy( 亚像素精度 )等输入的簇。 NI Vision 使用插值的方法来定位一个边界。Interpolation Type参数有...