scanning direction

scanning direction: In facsimile transmitting equipment, the scanning of an object, such as a message surface or the developed plane in the case of a drum, along parallel lines in a specified pattern. Note 1: The scanning direction is equivalent to scanning over a right-hand helix on a drum. Note 2: The orientation of the message on the scanning plane will depend upon its dimensions. Note 3: In facsimile receiving equipment, scanning from right to left and top to bottom, is called "positive" reception and from left to right and top to bottom, is called "negative" reception. (188) Note 4: Scanning direction conventions are included in CCITT Recommendations for phototelegraphic equipment.

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