Patent ID: 7362481
Filing Date: 2008-04-22
Classification: H04N

Abstract:
1. An adjusting dot position method for overlapped dots in a printer, the printer comprising a memory and three line buffers, an image to be printed being composed of pixels arranged in a two-dimensional array, wherein a pixel P(i, j) is in the i-th line and the j-th column, and a pixel P(i, j) is an overlapped dot which has at least two colors of magenta, cyan or yellow, the memory being used for storing the image to be printed, the three line buffers being coupled to the memory and used for temporarily storing three lines of pixels, the method comprising the steps of: (A) inputting the pixels of lines from the memory into the three line buffers; (B) determining whether the pixel P(i, j) in the three line buffers is an overlapped dot; if the pixel P(i, j) is an overlapped dot and a pixel on a left side is a blank dot, the magenta, cyan or yellow in the pixel P(i, j) is moved to the left side pixel in accordance with a predetermined first rule; (C) determining whether the pixel P(i, j) in the three line buffers is an overlapped dot; if the pixel P(i, j) is an overlapped dot and a pixel on a upper side is a blank dot, the magenta, cyan or yellow in the pixel P(i, j) is moved to the upper side pixel in accordance with a predetermined second rule; (D) outputting the first and the second line buffers; and (E) duplicating content in the third line buffer to the first line buffer and clearing the second and the third line buffers, and executing step (A) again.