Patent ID: 7457460

Claim:
A picture retrieving apparatus, comprising: a first orthogonal coefficient generating section which outputs a set of orthogonal coefficients of each of a plurality of pictures as a retrieval target picture; a second orthogonal coefficient generating section which outputs a set of orthogonal coefficients of a query picture; and an orthogonal transform coefficient similarity calculator which calculates a similarity between said set of orthogonal transform coefficients of said query picture and said set of orthogonal transform coefficient of said retrieval target picture. wherein said first orthogonal transform coefficient generating section comprises: a color histogram memory which stores a plurality of color histogram data of said plurality of pictures; and a first picture feature data converter which converts said color histogram data of said retrieval target picture read from said color histogram memory into said set of orthogonal transform coefficients of said retrieval target picture, and outputs to said orthogonal transform coefficient similarity calculator.