| 摘要 |
This specification discloses a system which operates on a pair of video signals using digital circuitry for determining the phase relationship between the two signals. The system is particularly adapted for determining the parallax between the left and right video signals in an orthophoto printer system of the type disclosed in my copending application Ser. No. 760,435, filed Sept. 18, 1968. The left and right video input signals derived from the stereophotograph scanning devices in that application are applied to novel frequency band-selection and video-to-digital converter circuits which operate to provide binary signals corresponding to selected frequency bands of the input signals. The output signals from the converter circuits are applied to a plurality of novel parallax discriminators connected in parallel circuit arrangement so that a multi-bit binary representation of the parallax existing between the pair of video input signals is obtained. Details of the overall system as well as of the video-to-digital converters and the digital parallax discriminators are provided.
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