Patent ID: 6144467
Filing Date: 2000-11-07
Classification: H04N

Abstract:
An image scanner, comprising:a scanning platform for placing thereon an object to be scanned, marked thereon:a document line for positioning an edge of said object;a first elongated color block located in front of said document line along a specific direction; anda second elongated color block located in front of said document line along said specific direction and having an interface with said first color block; anda photo-signal processing device passing by said scanning platform from a home position along said specific direction, and performing a scanning operation from a scan start point behind said first and said second color blocks to read image data of said object, and converting said image data of said object into digital data for further processing;wherein each of said first and said second elongated color blocks has a length greater than a length of said photo-signal processing device so that said photo-signal processing device detects colors of said first and said second elongated color blocks as standard colors for color calibrations when said photo-signal processing device passes by said first and said second elongated color blocks, and wherein said interface of said first and said second color blocks includes a first reference point and a second reference point whose coordinates are detected according to color changes therearound, a shift from said first reference point to said scan start point is of a predetermined vector which can be used together with said coordinate of said first reference point for determining a position of said scan start point, and a distance between said first and said second reference points is of a constant value which can be used together with said coordinates of said first and said second reference points for determining a deflection rate of a scan track and an amplification error of a scan result.