Patent ID: 7227665
Filing Date: 2007-06-05
Classification: H04N

Abstract:
1. An image processing apparatus comprising: a compressing portion which compresses an inputted image; a page memory which stores the compressed image from the compression portion; a decoding portion which decodes the compressed image stored in the page memory; a control portion which controls write and read of an image with respect to the page memory; a magnification changing portion which carries out magnification changing processing of changing the image size for the image decoded by the decoding portion; and a printer which prints the image provided from the magnification changing portion, and generates printer synchronous signal each time when the printer scans an image formation object surface, the control portion supplies the page memory, the decoding portion and the magnification changing portion with control signals so as to synchronize reading of the image from the page memory, the decoding processing of the decoding portion and the magnification changing processing of the magnification changing portion with the printer synchronous signal provided from the printer, wherein the control portion generates first and second synchronous signals synchronous with the printer synchronous signal based on an inputted magnification rate, the compressed images of a predetermined quantity of lines being read out from the page memory in response to the first synchronous signal, the decoding portion decodes the compressed image read out from the page memory in response to the second synchronous signal, and the magnification changing portion computes interpolation data from the image decoded by the decoding portion based on the magnification rate in response to the printer synchronous signal.