Image processing apparatus
AssigneeCanon Kabushiki Kaisha
InventorHiroshi Tanioka
Life of this patent
Estimating the term…
Abstract
It is determined whether an object pixel in entered image data resides on (a) part of a black character or line, (b) not on part of a black character or line but in close proximity thereto, (c) neither part of nor in close proximity to a black character or line. When it is determined that (a) holds, the object pixel is recorded using dark black ink only. When it is determined that (b) holds, a pixel comprising various color components is recorded using ink whose density is lower that that of ink having a designated density. When it is determined that (c) holds, namely that the object pixel is remote from a black character or line, the object pixel is recorded using the ink of the designated density.
Claims33
An image processing apparatus comprising:
- input means for inputting image data consisting of a plurality of color components expressed by n-levels (n>2) of values;
- converting means for converting the color components of n-level of values to m-level (2<m<n) of values;
- discriminating means for determining whether an object pixel is on part of a line of a predetermined color based upon the image data inputted by said input means;
- and
- correcting means for correcting color components of m-level of values of the object pixel based upon the determination made by said discriminating means.
An image processing apparatus comprising:
- input means for inputting image data consisting of a plurality of color components expressed by n-levels (n .gtoreq.2) of values;
- extracting means for extracting a degree of a predetermined color of inputted data indicative of an object pixel;
- discriminating means for determining, based upon the degree of the predetermined color extracted by said extracting means, whether the object pixel is not on part of a line of the predetermined color but is situated at a position in close proximity to the line of the predetermined color;
- and
- correcting means for correcting each color component of an output color of the object pixel based upon the determination made by said discriminating means.
An image processing apparatus comprising:
- input means for inputting image data consisting of a plurality of color components expressed by n-levels (n.gtoreq.2) of values;
- extracting means for extracting a degree of a predetermined color of inputted data indicative of an object pixel;
- discriminating means for determining, based upon the degree of the predetermined color extracted by said extracting means, whether the object pixel resides (a) on part of a line of the predetermined color, (b) not on part of a line of the predetermined color but at a position in close proximity to the line of the predetermined color, or (c) neither on part of nor in close proximity to the line of the predetermined color;
- and
- correcting means for correcting each color component of an output color of the object pixel based upon the determination made by said discriminating means.
Dependencies are inferred from the claim text.