公开(公告)号：US07580561B2

公开(公告)日：2009-08-25

申请号：US10505319

申请日：2003-02-07

申请人： Keith Robert Calder ,  Nordine Chaibelaine ,  Stuart Jonathan Levine

发明人： Keith Robert Calder ,  Nordine Chaibelaine ,  Stuart Jonathan Levine

IPC分类号： G06K9/00

CPC分类号： H04N1/646 ,  H04N1/6072

摘要： A compression and de-compression arrangement is provided for a display device having a display memory and a display. The arrangement includes a color processor which reduces the color samples by processing a pair of pixels to produce first and second luminance values and forming first and second output chrominance values from the pair of pixels. The first and second output chrominance values are formed by calculating for each pixel the corresponding U and V chrominance values and forming the first and second chrominance values (U, V) from the average of the values for each pixel.Forming the compressed representation of the color image provides an advantage when recovering the original image, particularly for example where the image contains detail and/or text. The image processing apparatus of the system receives the group of color component signal samples from the display memory and generates first and second output pixels, each comprising three color component values (R, G, B), from each group. The image processing apparatus includes a detail detection processor, which detects whether either of the pixels represented by each group of signal samples represents white or black and the other does not. This may be representative of one of the pixels being part of a text character or detail. Accordingly, in order to improve the likelihood of preserving the text and detail in the reproduced image, the de-compressing processor is arranged to assign the chrominance values (U1, V1) of one of the pixels to zero. The other chrominance value (U2, V2) of the other pixel is assigned the value of twice the value of the first and second input chrominance values respectively.

摘要翻译： 为具有显示存储器和显示器的显示装置提供压缩和解压缩装置。 该装置包括一个彩色处理器，它通过处理一对像素来产生第一和第二亮度值并从该对像素形成第一和第二输出色度值来减少颜色样本。 第一和第二输出色度值通过针对每个像素计算相应的U和V色度值并根据每个像素的值的平均值形成第一和第二色度值（U，V）来形成。 形成彩色图像的压缩表示在恢复原始图像时具有优势，特别是例如图像包含细节和/或文本的情况。 该系统的图像处理装置从显示存储器接收一组颜色分量信号样本，并且生成每个包括来自每个组的三个颜色分量值（R，G，B）的第一和第二输出像素。 图像处理装置包括细节检测处理器，其检测由每组信号样本表示的像素中的任一个是否表示白色或黑色，另一个不表示。 这可以代表作为文本字符或细节的一部分的像素之一。 因此，为了提高保存再现图像中的文本和细节的可能性，解压缩处理器被布置为将一个像素的色度值（U1，V1）分配给零。 另一个像素的另一个色度值（U2，V2）分别被分配为第一和第二输入色度值的两倍的值。