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    • 6. 发明申请
    • QUALITY BASED IMAGE COMPRESSION
    • 基于质量的图像压缩
    • US20070071335A1
    • 2007-03-29
    • US11559358
    • 2006-11-13
    • Kadayam ThyagarajanSteven Morley
    • Kadayam ThyagarajanSteven Morley
    • G06K9/36
    • H04N19/93H04N19/126H04N19/147H04N19/154H04N19/60H04N19/96
    • A system and method for quality-based image compression utilizing adaptively sized blocks and sub-blocks of discrete cosine transform coefficient data and a quality based quantization scale factor is claimed. A block size assignment element in an encoder element selects the block or sub-block of an input block of pixel data to be processed. Blocks with variances larger than a threshold are subdivided, while blocks with variances smaller than a threshold are not subdivided. A transform element transforms the pixel values of the selected blocks into the frequency domain. The frequency domain values are quantized either on a block by block basis or a frame by frame basis utilizing a scale factor that correlates with the quality of the image. The data is then serialized and coded in preparation for transmission.
    • 声称使用自适应大小的块和子块的离散余弦变换系数数据和基于质量的量化比例因子的基于质量的图像压缩的系统和方法。 编码器元件中的块大小分配元素选择要处理的像素数据的输入块的块或子块。 方差大于阈值的块被细分,而方差小于阈值的块不被细分。 变换元素将所选择的块的像素值变换为频域。 使用与图像的质量相关联的比例因子,逐个块地或逐帧地量化频域值。 然后将数据序列化和编码以准备传输。