Patent ID: 8861034

Claim:
A method for generating multi-bit depth halftone amplitude-modulation dots comprising: scanning an input image to obtain a value of a current pixel P xy , where x represents a lateral position index of the current pixel, and y represents a vertical position index of the current pixel; obtaining g j from a preset multi-bit depth threshold matrix G by starting with i=0, and determining if P xy <g j , if yes, providing a screening output gray level gradation value of a printer Out=L−1−i; otherwise, increasing i and repeating the determining and providing steps; where L represents the number of a frequency-modulation screen gradation, L=2 e , e represents a bit depth value of the printer, i is an integer and i∈[0,L−1], h is an index number of an element g arranged sequentially in G and h is provided as h=(y % n)×m+(x % m)+i×m×n, and g j is an element value of i th line and j th row in G.