HIGHMAGNIFICATIONAND LONG DISTANCEFACERECOGNITION:DATABASE ACQUISITION, EVALUATION,AND ENHANCEMENT

Before continuing ourdiscussions, wegive adefinition of different rangesof systemmagnifications and Inthis paper, wedescribe afacevideo database obtained observation distances fornear-ground surveillance (both fromLongDistances andwithHighMagnifications, IRIS- indoor andoutdoor), asseen inTable 1. LDHM. Bothindoor andoutdoor sequences arecollected underuncontrolled surveillance conditions. The Table 1Definition ofmagnification/distance ranges. significance ofthis database lies inthefact that itisthefirstRange Low/short MediumHigh/long Extreme database toprovide faceimagesfromlongdistancesMagnification 1x-3x 3x1Ox 1Ox-30x >30x (indoor: 1Om-20mandoutdoor: 50m-300m).The Distance lOOm corresponding system magnification iselevated fromless Coverage Most existing databasesOurdatabase than3xto20xforindoor andupto375xforoutdoor. The database hasapplications inexperimentations withhuman Ou dabse hs te floig itnusig idatabasentif appicationsadute nicn