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:
Jun. 18, 1996
Filed:
Oct. 06, 1995
Aoi Kitaura, Tenri, JP;
Kenji Kawahara, Nara, JP;
Sharp Kabushiki Kaisha, Osaka, JP;
Abstract
In a DCT (discrete cosine transformation)/inverse DCT arithmetic unit, data of an inputted image are inputted to a first one-dimensional N-th order DCT/inverse DCT arithmetic device using a first algorithm B. The first one-dimensional N-th order DCT/inverse DCT arithmetic device calculates a one-dimensional N-th order inverse DCT. Calculated results of the first one-dimensional N-th order DCT/inverse DCT arithmetic device are stored to a memory for intermediate results as intermediate results of the N-th order inverse DCT in M-dimensions. Similarly, a second one-dimensional N-th order DCT/inverse DCT arithmetic device calculates a one-dimensional N-th order inverse DCT using a second algorithm A, with stored data of the memory for intermediate results as an input. Calculated results of the second one-dimensional N-th order DCT/inverse DCT arithmetic device are outputted to the memory for intermediate results. Similarly, an M-th one-dimensional N-th order DCT/inverse DCT arithmetic device calculates a one-dimensional N-th order DCT/inverse DCT. Calculated results finally obtained by the M-th one-dimensional N-th order DCT/inverse DCT arithmetic device are set as output data, This DCT/inverse DCT arithmetic unit has a high arithmetic operation speed and a high arithmetic accuracy.