Download or read book Variable Illumination and Invariant Features for Detecting and Classifying Varnish Defects written by Ana Pérez Grassi and published by KIT Scientific Publishing. This book was released on 2014-08-14 with total page 170 pages. Available in PDF, EPUB and Kindle. Book excerpt: This work presents a method to detect and classify varnish defects on wood surfaces. Since these defects are only partially visible under certain illumination directions, one image doesn't provide enough information for a recognition task. A classification requires inspecting the surface under different illumination directions, which results in image series. The information is distributed along this series and can be extracted by merging the knowledge about the defect shape and light direction.