| 摘要 |
PURPOSE:To easily obtain a reduced picture, and to efficiently perform selecting work from a primary candidate picture by reading out the DC component of each block after orthogonal transformation stored in a first hierarchical memory area. CONSTITUTION:After the primary candidate picture is selected by key word retrieval, etc., the data set of a-area of each candidate picture is read out one after another from the first hierarchical memory area of a memory device 5, and after being decoded, it is stored in a first buffer memory 8, and displayed in order on a display device 12, the picture reduced to 1/4 can be displayed summarily since the first sequence component of an orthogonal transformation coefficient shows the mean value of picture elements in the block. Next, a secondary candidate picture is selected out of these summarily displayed pictures, and corresponding picture data is displayed hierarchically by the control of a retrieval controller 11. Thus, even an analogous picture can be retrieved in a short time. |
