发明名称 |
Method of and apparatus for processing an image |
摘要 |
An image is processed by using an error diffusion method of propagating density distribution errors in pixels around a pixel to be noted. A method includes the steps of calculating thresholds (Th1, Th2) of densities corresponding to the area ratio between the pixels; selecting a pixel to be noted (f) which are different in the area ratio from each other; calculating errors (E) produced in the peripheral pixels according to the distances from the peripheral pixels to the noted pixel and areas of the individual peripheral pixels; adding the propagated errors to a density of the noted pixel so as to make a rearrangement (f') on the density of the noted pixel; comparing the rearranged density of the noted pixel with the thresholds to obtain a corresponding level (G) represented in a binary form, and obtaining density distribution errors (e).
|
申请公布号 |
US5583661(A) |
申请公布日期 |
1996.12.10 |
申请号 |
US19940305481 |
申请日期 |
1994.09.13 |
申请人 |
RISO KAGAKU CORPORATION |
发明人 |
KURITA, SYOUJI;INAMINE, NOBORU;NOGUCHI, IKUO |
分类号 |
B41J2/52;B41J2/36;G06T5/00;H04N1/403;H04N1/405;(IPC1-7):H04N1/40 |
主分类号 |
B41J2/52 |
代理机构 |
|
代理人 |
|
主权项 |
|
地址 |
|