Facsimile and static presentation processing – Facsimile – Recording apparatus
Patent
1987-06-18
1989-04-18
Richardson, Robert L.
Facsimile and static presentation processing
Facsimile
Recording apparatus
358214, 358216, H04N 336
Patent
active
048232041
ABSTRACT:
A method and apparatus for correction of both horizontal and vertical film weave is disclosed in connection with continuous motion type moving beam recorder or playback devices such as electron beam or laser beam recorders or flying spot scanner or line scan telecines. Weave correction is accomplished by scanning the sprocket hole of the film and generating a correction signal to compensate for the film weave. The film weave is corrected by electronic weave correction as opposed to mechanical pin registration means. The sprocket hole is scanned in the vertical direction to locate the upper and lower edges of the sprocket hole, and then to position the beam in the vertical center of the hole and for determination of vertical weave of the film. The sprocket hole is then scanned in the hozizontal direction, for determination of the horizontal weave of the film. In a film to tape transfer system the edge position of the sprocket hole is advantageously determined by comparing the actual detected signal with a fast peak detector signal set at 90% of the actual signal level. Provision is made for setting windows for acceptable weave corrections signals such that if the detected error exceeds the window, the previous weave correction signal which is within the window is used.
REFERENCES:
patent: 4104680 (1978-08-01), Holland
Image Transform
Richardson Robert L.
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