| US 7,508,538 B2 | ||
| Image data rotation apparatus | ||
| Tomoya Ogawa, Hachioji (Japan); Tomohiro Suzuki, Nishitokyo (Japan); Yuji Tamura, Hachioji (Japan); Tetsuya Ishikawa, Hachioji (Japan); Hiroyasu Nishimura, Hachioji (Japan); Fumikage Uchida, Asaka (Japan); Nao Moromizato, Hachioji (Japan); and Masayuki Yasukaga, Hachioji (Japan) | ||
| Assigned to Konica Minolta Business Technologies, Inc., (Japan) | ||
| Filed on Oct. 22, 2004, as Appl. No. 10/971,324. | ||
| Claims priority of application No. 2004-151355 (JP), filed on May 21, 2004. | ||
| Prior Publication US 2005/0259294 A1, Nov. 24, 2005 | ||
| Int. Cl. H04N 1/40 (2006.01) | ||
| U.S. Cl. 358—1.17 [358/1.16; 358/448] | 8 Claims |
| 1. An image data rotation apparatus comprising:
(a) a first memory for storing 2-D image data wherein pixels are arranged in a matrix in a main scanning direction and sub-scanning
direction orthogonal to each other;
(b) a second memory; and
(c) a data control section for controlling the first memory and the second memory,
wherein at least one of the first and second memories is constituted by a SDRAM, and the data control section reads the image
data from the first memory in blocks of m pixels in the main scanning direction and n pixels in the sub-scanning direction,
writes the read data into the second memory, and transmits data to the memory composed of the SDRAM by conducting burst transmission
and continuous supply of desired column addresses, thereby allowing the read image data to be rotated, where n and m represent
natural numbers,
wherein the data control section gives one of row addresses inside the SDRAM to enable transmission of image data in the row,
and sequentially selects a desired column in the row addresses, thereby allowing the image data of the selected column to
be transmitted, and wherein when selecting the desired column address in the row address, the data control section thins out
the columns, and transmits the data.
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