| 摘要 |
PURPOSE:To omit an unnecessary movement, to reduce capacity of a memory for storing a picture data, and also to execute processing at a high speed, by moving a heat to only a place in which a picture exists. CONSTITUTION:In an image sensor 1, 8 directions are selected from its center, and in each direction, 8 sections S1-S8 are decided. Subsequently, the algebraic sum of luminance of an element contained in each section is calculated. When the algebraic sum of luminance is taken in each section and a head 3 is moved in the direction where this algebraic sum is small, the head converned always tracks on a line. As a result, an unnecessary part having no picture information is not swept by the head 3, therefore, the processing time is quickened. Also, since a picture data is stored only in the direction where the head 3 moves, a memory is utilized effectively. |
