摘要：The digital image concept is defined. Means of obtaining digital images are presented together with the differences between digital photography and traditional film photography. Open source products that manage and edit digital images are identified. Ways of generating digital images are presented. The quality characteristics of file representations are presented. The ways of comparing files is analyzed and orthogonality measures are given that process the structured entities contained in the files. The image comparison operation is analyzed. The indicator of image orthogonality is defined. Logos are defined. Logo comparison operations are detailed. AVIO - the organizational identifier validation application is presented. The algorithm implemented in AVIO used to determine logo orthogonality is detailed.
关键词：orthogonality; images; open source; comparison; normalization
