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    • 1. 发明授权
    • Direct memory access transfer apparatus
    • 直接存储器存取传送装置
    • US06606673B2
    • 2003-08-12
    • US09757472
    • 2001-01-11
    • Hirokazu SuzukiToshihisa KamemaruHideo Ohira
    • Hirokazu SuzukiToshihisa KamemaruHideo Ohira
    • G06F1300
    • G09G5/391G06F13/28
    • Two-dimensional addresses of lateral lines of a rectangular area are produced in a prescribed scanning order in a sender-memory control unit as readout addresses of a sender's memory, pieces of pixel data corresponding to the readout addresses are read out from the sender's memory, the pieces of pixel data read out are sub-sampled at a sample ratio of n:1 in a direction of each lateral line according to a quincunx method in a data transforming unit, two-dimensional write addresses of a receiver's memory are produced in a receiver-memory control unit, and pieces of sub-sampled pixel data are written in the receiver's memory. Accordingly, the pieces of pixel data can be sub-sampled and transferred at a high speed in a DMA transfer apparatus.
    • 在发送者存储器控制单元中以规定的扫描顺序产生矩形区域的横线的二维地址,作为发送者存储器的读出地址,从发送者的存储器读出对应于读出地址的像素数据, 读出的像素数据在数据变换单元中根据五次方法在每条横线的方向上以n:1的采样比进行子采样,接收机的存储器的二维写入地址以 接收器存储器控制单元和多个子采样像素数据被写入接收器的存储器中。 因此,可以在DMA传送装置中高速地对像素数据进行子采样和传送。
    • 7. 发明授权
    • Method and apparatus for digital image decoding
    • 数字图像解码方法和装置
    • US06208689B1
    • 2001-03-27
    • US08806668
    • 1997-02-26
    • Hideo OhiraKenichi AsanoToshiaki ShimadaKohtaro AsaiTokumichi Murakami
    • Hideo OhiraKenichi AsanoToshiaki ShimadaKohtaro AsaiTokumichi Murakami
    • H04B166
    • H04N19/577H04N19/115H04N19/126H04N19/14H04N19/15H04N19/159H04N19/172H04N19/177H04N19/423H04N19/428H04N19/61
    • A method and apparatus of digital image decoding is provided for reducing compression-related deterioration of an image to a minimum with a reduced storage capacity. The digital image decoding apparatus is equipped with a compression rate judging section for judging an optimal rate of compression for effecting the least deterioration to the image based upon the size of image in connection with the storage capacity of a frame memory. A compressing section compresses decoded data based upon the optimal rate of compression and sends the compressed data to a predictive/display frame memory for storage. An expanding A section expands the compressed data based upon the optimal rate of compression and sends the expanded data to a decoding section when the expanded data is required. An expanding B section reads out the compressed data of a display frame from the predictive/display frame memory and expands the compressed data based upon the optimal rate of compression and sends the expanded data to a display unit for display.
    • 提供一种数字图像解码的方法和装置,用于以降低的存储容量将图像的压缩相关劣化降至最低。 数字图像解码装置配备有压缩率判定部,其根据与帧存储器的存储容量相关联的图像的大小来判断压缩的最佳速率,以实现图像的劣化。 压缩部分基于最佳压缩率压缩解码数据,并将压缩数据发送到预测/显示帧存储器以进行存储。 扩展的A部分根据最佳压缩速率扩展压缩数据,并在扩展数据需要时将扩展数据发送到解码部分。 扩展B部分从预测/显示帧存储器中读出显示帧的压缩数据,并根据最佳压缩率扩展压缩数据,并将扩展数据发送到显示单元进行显示。