公开(公告)号：US5646751A

公开(公告)日：1997-07-08

申请号：US452625

申请日：1995-05-25

申请人： Margaret Motamed ,  Jeffrey N. Kellman

发明人： Margaret Motamed ,  Jeffrey N. Kellman

IPC分类号： B41J5/30 ,  G06T1/00 ,  G09G5/02 ,  H04N1/60 ,  H04N1/64 ,  G03F3/08 ,  H04N1/46

CPC分类号： H04N1/644

摘要： A method for increasing the speed of color conversion from a plurality of color spaces to a single color space by reducing the number of color pixels by a factor of two prior to the color conversion step. This pixel reduction constitutes a lossy data compression scheme which takes advantage of the advance knowledge that the pixels will later undergo anti-aliasing by averaging subsequent to the color conversion. First the pixels are grouped into pairs, and one pixel of each pair is eliminated to form a pseudo halfpixel. The eliminated pixel is replaced with a tag identifying either the previous, current or next pseudo halfpixel. Then each pseudo halfpixel is color converted. Finally the indicated previous, current or next pseudo halfpixel, now color converted, is averaged with the current pseudo halfpixel to form a halfpixel, which is then averaged with the halfpixel above or below it to form an anti-aliased full pixel which can be displayed. The color conversion time of this process is roughly halved since half of the pixels are eliminated before the color conversion step and then effectively added back in after the color conversion step.

摘要翻译： 一种用于通过在颜色转换步骤之前将彩色像素的数量减少2倍的方法来增加从多个颜色空间到单个颜色空间的颜色转换的速度。 该像素减小构成有利的数据压缩方案，其利用提前知识的优点，即随后的颜色转换，像素将经过平均化后的抗锯齿。 首先，将像素分组成对，并且消除每对中的一个像素以形成伪半像素。 消除的像素被标识前一个，当前或下一个伪半像素的标签替换。 然后将每个伪半像素进行颜色转换。 最后，所指示的先前的，当前的或下一个伪半像素（现在被颜色转换）与当前的伪半像素平均以形成半像素，然后将其与其上方或下方的半像素进行平均，以形成可显示的抗锯齿全像素 。 该过程的颜色转换时间大致减半，因为在颜色转换步骤之前消除了一半像素，然后在颜色转换步骤之后被有效地加回。

公开(公告)号：US5365601A

公开(公告)日：1994-11-15

申请号：US811865

申请日：1991-12-23

申请人： Vinod K. Kadakia ,  Jeffrey N. Kellman ,  Christine Kang

发明人： Vinod K. Kadakia ,  Jeffrey N. Kellman ,  Christine Kang

IPC分类号： G06F3/153 ,  G06T3/60 ,  G09G5/36 ,  H04N1/387 ,  G06K9/32

CPC分类号： G06T3/60

摘要： A circuit for rapidly rotating a digital image through 90 or 270 degrees utilizing memory implemented from ordinary 4-bit wide memory devices. This pipelined circuit transfers the image through a page buffer and a band buffer in a series of memory accessing, shining and reordering steps which converts all vertical lines to horizontal lines and all horizontal lines to vertical lines without requiring the use of a parallel to serial conversion.

摘要翻译： 一种用于通过使用从普通4位宽存储器件实现的存储器使数字图像快速旋转90或270度的电路。 这种流水线电路通过页缓冲器和带缓冲器将图像传送到一系列存储器访问，闪烁和重排序步骤，其将所有垂直线转换成水平线，将所有水平线转换成垂直线，而不需要使用并行到串行转换 。