Patent ID: 6104841
Filing Date: 2000-08-15
Classification: G06T,H04N

Abstract:
A method of reading and processing an image by a sensor, said sensor comprising at least a line of detectors disposed in a first direction for detection lines of pixels of the image, said sensor moving relative to the image in a second direction perpendicular to the first direction and reading the image and providing image processor that produces an output image, the method comprising the steps of:setting a magnification ratio of the output image to the image, the magnification ratio being in one of n contiguous magnification ratio ranges between a reference magnification ratio and a minimum magnification ratio;setting a moving speed of the sensor relative to the image as a function of the magnification ratio such that, within each magnification ratio range i,for i=2 to n, the moving speed of the sensor decreases, in inverse proportion to an increase in the magnification ratio, from a maximum speed at a lowest magnification ratio in the magnification ratio range to the maximum speed decreased by 1/i at a highest magnification ratio in the magnification ratio range, and,for i=1, the moving speed of the sensor decreases, in inverse proportion to an increase in the magnification ratio, from the maximum speed at a lowest magnification ratio in the magnification ratio range to a reference speed at a highest magnification ratio in the magnification ratio range; andreading and processing only one of every i lines of pixels of the image when the magnification ratio is in the magnification ratio range i, for i=1 to n.