Title:
DCTインタフェースに対するRGBとYCrCb色空間の間のデータのオン・ザ・フライ転送
Document Type and Number:
Japanese Patent JP4628647
Kind Code:
B2
Abstract:
A method for transferring data on the fly between an RGB color space and a YCrCb color space useful for a DCT block-computation engine significantly increases throughput and decreases processor overhead. According to one example embodiment, data is transferred from an RBG color space memory to a YCrCb color space memory in a form useful for presentation to a DCT block-computation engine. In response to accessing the RBG color space memory, the RBG values are asynchronously written to YCrCb intermediate buffers so that one of the YCrCb intermediate buffers is filled through sub-sampling in a manner useful for the DCT block-computation engine while another of the YCrCb intermediate buffers is still being filled. The DCT block-computation engine then accessed the filled YCrCb intermediate buffers while the other of the YCrCb intermediate buffers continues to collect RGB values from the RGB color space memory for the next DCT computation. Other aspects are directed to conversion of the RGB color space to the YCrCb color space using, respectively, a block-by-block conversion, a line-by-line conversion, and a word-by-word conversion.
Inventors:
David, Earl Eboy
Application Number:
JP2002543236A
Publication Date:
February 09, 2011
Filing Date:
November 13, 2001
Export Citation:
Assignee:
NXP B.V.
International Classes:
H04N11/04; H04N19/186; G06T1/00; H04N1/46; H04N1/60; H04N7/26; H04N7/30; H04N9/64; H04N19/60
Domestic Patent References:
| JP3076398A | ||||
| JP7087333A | ||||
| JP2000102037A |
Attorney, Agent or Firm:
Kenji Yoshitake
Hidetoshi Tachibana
Takeshi Sekine
Takahashi
Hiroshi Yoshimoto
Hidetoshi Tachibana
Takeshi Sekine
Takahashi
Hiroshi Yoshimoto