| 摘要 |
Image signals of a progressive scan image are formed by arranging the image signals in each field in a normal order, even when the image signals in an interlace system are input, while a phase difference between a vertical synchronization signal and a horizontal synchronization signal is not constant. A switch sequentially selects a field memory in a field memory unit every time a vertical synchronization signal Vsync is input. In the selected field memory, a timer value of a timer, which is from an input of the vertical synchronization signal to an input of each horizontal synchronization signal, is written together with an image signal subsequent to each horizontal scanning signal. A sort processing unit reads image signals from two field memories in which the timer values and the image signals were recently written, arranges the image signals in order of the timer values corresponding to the image signals, and writes the image signals in a frame memory.
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