| 摘要 |
A video signal capturing apparatus has a converter unit that converts an input video signal into digital video data and a digital video data writing control unit that controls writing of the digital video data converted by the converter unit in a memory. Thereby, digital video data for an external processing apparatus that uses the digital video data stored in the memory is captured. A separator unit separates a horizontal synchronizing signal from the input video signal. Based on the horizontal synchronizing signal thereby separated, a writing instructing unit instructs that the portion of the digital video data corresponding to an image information transmission be written in the memory. Thereby storage of unnecessary data is avoided in contrast with an apparatus that captures all the data including synchronizing signals. Based on the horizontal synchronizing signal, a time interval calculator unit calculates a time interval between start of a present horizontal scan and start of the previous horizontal scan. The writing instructing unit instructs that data regarding the calculated start time interval be written in the memory in combination with the digital video data corresponding to the present horizontal scan. Therefore, a timing shift of a horizontal synchronizing signal that may be caused by the lengthening or shorting of the signal is compensated for.
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