Patent ID: 6469748
Filing Date: 2002-10-22
Classification: H04N

Abstract:
A video signal capturing apparatus for capturing digital video data stored in a memory, the digital video data corresponding to image data for use by a processing apparatus, the video signal capturing apparatus comprising:a separator unit that separates a vertical synchronizing signal from an input video signal; a video data writing control unit that controls writing digital video data in the memory; a determining unit that distinguishes a plurality of color fields in the video signal based on a numbered count of vertical synchronizing signals separated by the separator unit; and a writing instructing unit that instructs the video data writing control unit to write the digital video data in the memory when a field determined by the determining unit corresponds to a field indicated by a setting, wherein the writing instructing unit comprises a timing generation circuit that determines when the digital video data is written in memory, a field counter that outputs a count value to the timing generation circuit, and a register which contains the field indicated by the setting, and wherein the timing generation circuit comprises a first and a second internal counter, the first internal counter counting up by clock signals and cleared to zero by horizontal synchronizing signals, the second internal count counting up by the horizontal synchronizing signals and cleared to zero by the vertical synchronizing signals, the timing generation circuit determining when the digital video data is written in the memory based on outputs of the first and second internal counters and the field indicated by the setting in the register.