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    • 5. 发明授权
    • Image data compression and decompression
    • 图像数据压缩和解压缩
    • US06683979B1
    • 2004-01-27
    • US09458011
    • 1999-12-10
    • Christopher A. WalkerMarc A. Schafer
    • Christopher A. WalkerMarc A. Schafer
    • G06K900
    • G06T9/005
    • System, method and apparatus for compressing and decompressing image data. In an embodiment, a color cell is compressed by: defining at least four luminance levels of the color cell; generating a bitmask for the color cell, the bitmask having a plurality of entries each corresponding to a respective one of the pixels, each of the entries for storing data identifying one of the luminance levels associated with a corresponding one of the pixels; calculating a first average color of pixels associated with a first one of the luminance levels; calculating a second average color of pixels associated with a second one of the luminance levels; and storing the bitmask in association with the first average color and the second average color. In a second embodiment of the present invention, a color cell is compressed by: determining a luminance value (Y) for each pixel of the color cell; selecting a maximum luminance value (YMAX) and a minimum luminance value (YMIN) for the color cell; subdividing the interval YMAX to YMIN into at least two approximately equal subintervals; generating at least one bitmask that associates each pixel of the color cell with one subinterval; and determining a representative color value for each subinterval from the pixels of the color cell associated with the subinterval. Compression can be performed at a real-time rate. The present invention can support the compression of luminance, intensity and alpha textures.
    • 用于压缩和解压缩图像数据的系统,方法和装置。 在一个实施例中,通过以下方式压缩彩色单元:限定彩色单元的至少四个亮度级; 为所述彩色单元生成位掩码,所述位掩码具有多个条目,每个条目各自对应于所述像素中的相应一个像素,所述条目中的每一个用于存储识别与所述像素中的相应一个像素相关联的亮度级中的一个的数据; 计算与所述亮度级中的第一个相关联的像素的第一平均颜色; 计算与第二个亮度级相关联的像素的第二平均颜色; 以及存储与第一平均颜色和第二平均颜色相关联的位掩码。 在本发明的第二实施例中,通过以下步骤压缩彩色单元:确定彩色单元的每个像素的亮度值(Y); 选择彩色单元的最大亮度值(YMAX)和最小亮度值(YMIN); 将间隔YMAX与YMIN分割为至少两个近似相等的子区间; 生成将所述颜色单元的每个像素与一个子间隔相关联的至少一个位掩码; 以及从与所述子间隔相关联的所述彩色单元的像素确定每个子间隔的代表色值。 压缩可以以实时速率进行。 本发明可以支持亮度,强度和α纹理的压缩。
    • 6. 发明授权
    • Hub system with ring arbitration
    • 具有环形仲裁的集线器系统
    • US06330245B1
    • 2001-12-11
    • US09207655
    • 1998-12-09
    • Steven BrewerNicholas M. StapletonChristopher A. Walker
    • Steven BrewerNicholas M. StapletonChristopher A. Walker
    • H04L1242
    • H04L12/433
    • A data network hub unit is stackable with other such units to constitute a hub in which each of the units can supply data packets to network data destinations and receive data packets from network data sources, and to form a closed data transmission ring which enables packets received at any unit to be transmitted from any other unit. The hub unit includes arbitration control means responsive to packet headers circulating on said ring. The arbitration control means is operative: (i) when the hub unit acts a master unit to supply data packets, to modify data packets to provide them each with an arbitration header which includes a grant field, a request priority field, capable of indicating various different level of priority, and a grant priority field; (ii) when the hub unit is acting as the master unit and has no more data packets to supply to the ring, to respond to an arbitration header which has a set priority field by setting the grant field and setting the grant priority field; (iii) when the hub unit is not the master unit but has data packets to place on the ring, to respond to arbitration headers by setting a priority field; and (iv) when the hub unit is not the master unit but has data packets to send, to respond to an arbitration header which has the grant field set and a grant priority field indicating a priority level corresponding to the priority requested by this unit to become the master unit.
    • 数据网络集线器单元可以与其他这样的单元堆叠以构成集线器,其中每个单元可以向网络数据目的地提供数据分组,并从网络数据源接收数据分组,并形成一个封闭的数据传输环,使得能够接收分组 在任何单位从任何其他单位传输。 集线器单元包括响应于在所述环上循环的分组报头的仲裁控制装置。 仲裁控制装置是可操作的:(i)当集线器单元作为主单元提供数据分组时,修改数据分组以向它们提供包括准许字段的仲裁报头,请求优先级字段,能够指示各种 不同级别的优先级和授权优先级字段; (ii)当集线器单元充当主单元并且没有更多数据分组提供给环时,通过设置授权字段并设置授权优先级字段来响应具有设置优先级字段的仲裁报头; (iii)当集线器单元不是主单元,但是具有放置在环上的数据分组时,通过设置优先级字段来响应仲裁报头; 以及(iv)当集线器单元不是主单元而是具有要发送的数据分组时,响应具有授权字段集的仲裁报头以及指示与该单元请求的优先级相对应的优先级的授权优先级字段 成为主机。