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Image Scanning Control Method for Accumulation-Type Sensor

IP.com Disclosure Number: IPCOM000062712D
Original Publication Date: 1986-Oct-01
Included in the Prior Art Database: 2005-Mar-09
Document File: 2 page(s) / 24K

Publishing Venue

IBM

Related People

Komiyama, E: AUTHOR [+2]

Abstract

To obtain a high-quality scanned image of an object using an accumulation-type sensor when the relative movement of the object and scanner in scanning is stopped and restarted, a high intensity LED (light-emitting diode) is used as a light source for the sensor to be energized so that the exposure time of the sensor for each scan cycle can always be constant and not saturate the sensor even when the object (or the scanner) is being accelerated or decelerated. During the time when the relative movement of the object and scanner is in a predetermined constant speed, the light source is continuously energized to provide the constant exposure time of the sensor for each scan cycle.

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Image Scanning Control Method for Accumulation-Type Sensor

To obtain a high-quality scanned image of an object using an accumulation-type sensor when the relative movement of the object and scanner in scanning is stopped and restarted, a high intensity LED (light-emitting diode) is used as a light source for the sensor to be energized so that the exposure time of the sensor for each scan cycle can always be constant and not saturate the sensor even when the object (or the scanner) is being accelerated or decelerated. During the time when the relative movement of the object and scanner is in a predetermined constant speed, the light source is continuously energized to provide the constant exposure time of the sensor for each scan cycle. As shown in the figure, when the object (or the scanner) is being decelerated to stop, the light source is controlled, by shift pulses provided from the controller in association with the speed of the relative movement, to be energized only for the time corresponding to the constant exposure time, so a fixed amount of exposure is provided to the sensor. This makes it unnecessary to control such an additional operation in a conventional scanning method that, when the relative movement is stopped and restarted, the object (or the scanner) is reversely moved without the energization of the light source through a predetermined distance necessary to decelerate or accelerate it to the constant speed in the succeeding forward movement to...