Image encoding apparatus and control method thereof

Details Image encoding apparatus and control method thereof Image encoding apparatus and control method thereof

2007-09-27

2011-10-18

Le, Brian Q (Department: 2624)

Image analysis

Image compression or coding

Transform coding

C382S243000, C382S164000, C382S166000, C382S173000

Reexamination Certificate

active

08041135

ABSTRACT:
An apparatus and method encodes into block units an image in which halftone images and character and/or line images are mixed, and makes a substitution value, substituting for pixels in which pixels of a character and/or line image exist, a value whereby the occurrence of quantization errors of direct current components after frequency conversion is substantially zero, thereby minimizing block distortion of images when decoding. Therefore, a blocking unit inputs images in 8×8 pixel blocks. An acquisition unit acquires pixel data of character and/or line images as acquisition color information and acquires identification information identifying character and/or line image pixel positions. A substitution unit substitutes pixel data acquired as character and/or line images in image data of input blocks with a substitution value determined based on pixel data having halftone attributes.

REFERENCES:
patent: 5848185 (1998-12-01), Koga et al.
patent: 5848857 (1998-12-01), Killworth et al.
patent: 5854857 (1998-12-01), de Queiroz et al.
patent: 5949555 (1999-09-01), Sakai et al.
patent: 6084984 (2000-07-01), Ishikawa
patent: 6272255 (2001-08-01), de Queiroz et al.
patent: 6307962 (2001-10-01), Parker et al.
patent: 6519052 (2003-02-01), Oneda et al.
patent: 7133565 (2006-11-01), Toda et al.
patent: 7386168 (2008-06-01), Misawa
patent: 7747089 (2010-06-01), Mori
patent: 2005/0180645 (2005-08-01), Hasegawa et al.
patent: 2006/0171587 (2006-08-01), Kanatsu
patent: 4-326669 (1992-11-01), None
Timothy Arndt, “CIS 658 lecture note on JPEG Fall 2005,URL”www. cis.csuohio.edu/˜arndt/jpeg.ppt, 39 Pages.

Affiliated with

Also associated with

Rating

Image encoding apparatus and control method thereof does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Image encoding apparatus and control method thereof, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Image encoding apparatus and control method thereof will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-4275852