Patent ID: 6947169
Filing Date: 2005-09-20
Classification: H04N

Abstract:
1. An image feature amount acquisition apparatus for acquiring a feature amount of an image by subjecting image data of the image expressed in pixels in a dot matrix form to statistical calculation processing, the apparatus comprising: a thumbnail presence/absence judging unit which judges whether said image data have thumbnail data in addition to an original image data; a precision selecting unit which selects a level of precision required for said feature amount; a statistical calculation selecting unit which selects either a thumbnail statistical calculation unit or a sampling and statistical calculation unit by using the result of selection by said precision selecting unit and the result of judgement by said thumbnail presence/absence judging unit, wherein a feature amount acquisition unit which acquires a feature amount characterizing said original image data by using the selected statistical calculation result obtained from one of said thumbnail statistical calculation unit and said sampling and statistical calculation unit.