Computer Vision News - October 2019

Fruit sorting and grathing Visual SfM 19 There is no need for manual installation procedure, just extract the zip file into the target directory and it is ready to use. To open the GUI, open the file named VisualSFM.exe. Getting Started Now you should see the home screen of the application that looks as follows: VSfM enables to reconstruct a sequence of images in two ways; the first is by loading the sequence directly to the application, the second is by supplying an additional set of SIFT features. We will use the first option. To this end we press File->Open+Multi Images, then we choose the sequence we would like to reconstruct. Usually, when a JPEG file is loaded, EXIF information exists and the focal length in this case is known; otherwise, the application assumes a constant focal length and an estimated calibration matrix is created. Next, we would like to compute SIFT features and find correspondences between frames. To do that we press SfM->Pairwise Matching- >Compute Missing Match. Behind the scene features are extracted. Specifically, in SIFT, a difference of Gaussians (DoG) filter is convolved with all regions in the image across different scales with different pipeline created by Changchang Wu. It can be used for any 3D reconstruction application producing high accuracy results in short time. The simple GUI enables the user to control the stages of the reconstruction without using code. When needed, the reconstruction, matches, and key-points can be exported into a file and post process with any programming language desired. VSfM runs very fast by exploiting multicore parallelism for feature detection, feature matching, and bundle adjustment. In this article, we explain exactly how to use it and how it works. Download and installation VSfM can be download from here . If you have Cuda installed on your machine I would recommend downloading the GPU version for faster computations. I downloaded the 64-bit version for Windows as can be seen in the image below: There is no need for manual installation procedure, just extract the zip file into the target directory and it is ready to use. To open the GUI, open the file named VisualSFM.exe. Getting Started Now you should see the home screen of the application that looks as follows: VSfM enables to reconstruct a sequence of images in two ways; the first is by loading the sequence directly to the application, the second is by supplying an additional set of SIFT