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1. 发明授权

US06259810B1 Method and system of decoding compressed image data 失效
标题翻译：解压缩图像数据的方法和系统
公开(公告)号：US06259810B1
公开(公告)日：2001-07-10
申请号：US08838186
申请日：1997-04-15
申请人： John W. Gill , Bruce A. Johnson
发明人： John W. Gill , Bruce A. Johnson
IPC分类号： G06K900
CPC分类号： G06T9/005
摘要： A method and system of encoding and decoding image data in images having less than 128 distinct colors. Eight bit data bytes representing the color of each pixel data are re-indexed for each pixel to seven or less bits, and a sub-palette stores the relationship between the re-indexed colors and the original eight-bit color values. The remaining bits in the byte store run lengths of pixels that have contiguous colors. Further data compression is achieved by grouping pixels into rows, eliminating any duplicate rows and identifying the pixel data by a series of row pointers. Still further compression is accomplished by dropping representations of transparent pixels from the end of rows and representing a number of transparent pixels at the beginning of rows with a single byte. The compressed data is efficiently decoded using the row pointers to expedite vertical clipping of the image and adjusting horizontal clipping for leading and trailing transparent pixels.
摘要翻译：对具有少于128种不同颜色的图像中的图像数据进行编码和解码的方法和系统。表示每个像素数据的颜色的八位数据字节对于每个像素被重新索引到七个或更少位，并且子调色板存储重新索引的颜色和原始的八位颜色值之间的关系。字节存储中的其余位运行具有连续颜色的像素长度。通过将像素分组成行，实现进一步的数据压缩，消除任何重复行并通过一系列行指针识别像素数据。进一步的压缩是通过从行的末端丢弃透明像素的表示来实现的，并且用单个字节表示行的开始处的多个透明像素。使用行指针对压缩数据进行有效的解码，以加快图像的垂直裁剪并调整前导和后置透明像素的水平裁剪。

2. 发明授权

US5883633A Method and system of variable run length image encoding using sub-palette 失效
标题翻译：使用子调色板的可变游程长度图像编码的方法和系统
公开(公告)号：US5883633A
公开(公告)日：1999-03-16
申请号：US838187
申请日：1997-04-15
申请人： John W. Gill , Bruce A. Johnson
发明人： John W. Gill , Bruce A. Johnson
IPC分类号： G06T9/00 , G06F15/00
CPC分类号： G06T9/005
摘要： A method and system of encoding image data in images having less than 128 distinct colors. Eight bit data bytes representing the color of each pixel data are re-indexed for each pixel to seven or less bits, and a sub-palette stores the relationship between the re-indexed colors and the original eight-bit color values. The remaining bits in the byte store run lengths of pixels that have contiguous colors. Further data compression is achieved by grouping pixels into rows, eliminating any duplicate rows and identifying the pixel data by a series of row pointers. Still further compression is accomplished by dropping representations of transparent pixels from the end of rows and representing a number of transparent pixels at the beginning of rows with a single byte.
摘要翻译：对具有小于128种不同颜色的图像中的图像数据进行编码的方法和系统。表示每个像素数据的颜色的八位数据字节对于每个像素被重新索引到七个或更少位，并且子调色板存储重新索引的颜色和原始的八位颜色值之间的关系。字节存储中的其余位运行具有连续颜色的像素长度。通过将像素分组成行，实现进一步的数据压缩，消除任何重复行并通过一系列行指针识别像素数据。进一步的压缩是通过从行的末端丢弃透明像素的表示来实现的，并且用单个字节表示行的开始处的多个透明像素。

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