PPT-Image Feature Descriptors

Kenton McHenry PhD Research Scientist Raster Images 092 093 094 097 062 037 085 097 093 092 099 095 089 082 089 056 031 075 092 081 095 091 089 072. Categorization. . With. . Bags. of . Keypoints. Original . Authors. :. G.. . Csurka. , C.R. Dance, L. Fan, . J. . Willamowski. , C. Bray. ECCV Workshop on . Statistical. Learning in Computer – 2004. CSE P 576. Larry Zitnick (. larryz@microsoft.com. ). 20,000 images of Rome. =. ?. Large scale matching. How do we match millions or billions of images in under a second?. Is it even possible to store the information necessary?. . local. image . descriptors. . into. . compact. . codes. Authors. :. Hervé. . Jegou. Florent. . Perroonnin. Matthijs. . Douze. Jorge. . Sánchez. Patrick . Pérez. Cordelia. Schmidt. Presented. Image from http://graphics.cs.cmu.edu/courses/15-463/2010_fall/. Robust feature-based alignment. So far, we’ve assumed that we are given a set of “ground-truth” correspondences between the two images we want to align. Matthew Brown. University of British Columbia. (prev.) Microsoft Research. [ Collaborators: . †. Simon Winder, *Gang . Hua. , . †. Rick . Szeliski. . †. =MS Research, *=MS Live Labs]. Applications @MSFT. vision. Applications and Algorithms in CV. Tutorial . 9:. Descriptors. Visual Descriptors. Motivation::. Scene Classification. I. ntroduction. How to differentiate between scenes?. Applications and Algorithms in CV. Eric Brenner. Paul Carpenter. Daniel Ehrenberg. Aaron McCarty. Travis Raines. Advised by Jeff . Ondich. Defining the Problem. What is optical character recognition (OCR)?. Input: an image of some text. 3 types of descriptors. :. SIFT / PCA-SIFT . (. Ke. , . Sukthankar. ). GLOH . (. Mikolajczyk. , . Schmid. ). DAISY . (. Tola. , et al, Winder, et al). Comparison of descriptors . (. Mikolajczyk. @ . Takuki. Nakagawa, . Department of Electronic Engineering The University of Tokyo, Japan and . Tadashi Shibata, . Department of Electrical Engineering and Information Systems The University of Tokyo, Japan . CS5670: Computer Vision. Noah Snavely. Reading. Szeliski: 4.1. Announcements. Project 1 Artifacts due tomorrow, Friday 2/17, at 11:59pm. Project 2 will be released next week. In-class quiz at the beginning of class Thursday. 2014-03. Popular Visual Features. Global feature. Color correlation histogram. Shape context. GIST. Color name. Local feature. Detector. DoG, MSER, Hessian Affine, KAZE. FAST. Descriptor. SIFT, SURF, LIOP. Samantha Horvath. Learning Based Methods in Vision. 2/14/2012. Introduction. Computer vision makes use of many “hand-crafted” descriptors.. These descriptors share many common components. This paper presents a modular framework for designing and optimizing new feature descriptors . Asilomar. SSC. Karl . Ni, . Ethan Phelps, Katherine Bouman, Nadya Bliss. Lincoln Laboratory, Massachusetts Institute of Technology. 2. November 2012. This work is sponsored by the Department of the Air Force under Air Force contract FA8721-05-C-0002. Opinions, interpretations, conclusions, and recommendations are those of the author and are not necessarily endorsed by the United States Government.. Basic correspondence. Image patch as descriptor, NCC as similarity. Invariant to?. Photometric transformations?. Translation?. Rotation?. Scaling?. Find dominant orientation of the image patch. This is given by .