The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Sep. 03, 1991
Filed:
Jan. 30, 1990
Konica Corporation, Tokyo, JP;
Abstract
An image data compression apparatus, in that a component characteristic value of an AC component in a block obtained by dividing digital tonal image data is compared with a predetermined threshold value so that a frequency of an AC component at the highest frequency side having the component characteristic value over the threshold value is determined as a boundary value, and in that the AC component exceeding the boundary value is not handled as a substantial transform coefficient. When the transform coefficients in a high-frequency side in the block is cut according to an image content of the block a lower limit of a frequency to be cut is determined, so that a frequency lower than the lower limit determined may not be cut.