| 摘要 |
This application discloses an improved system which operates automatically to provide an orthophotograph from one or more pairs of stereo aerial photographs. The system disclosed includes first and second photo-scanning devices which are operated in synchronism to provide data signals for each spot of the two photographs making up a stereo pair. In addition to the usual correlation network which operates on the data signals to determine the amount of parallax error, the system includes image transformation circuitry and raster shaping circuits controlled thereby for altering the scan patterns of the two photo-scanning devices. Efficiency of the correlator is thereby improved, and the problems associated with changes in the elevation of the terrain being mapped are overcome to an extent such that patch printing of a large area is accomplished without the usual discrepancies in alignment of detail in adjacent patches. Details of the raster shaping system, the signal correlator providing the input signals for the raster shapers, and the signal analyzer of the correlator are provided along with a detailed description of the overall system.
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