Patent ID: 7508538
Filing Date: 2009-03-24
Classification: H04N

Abstract:
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.