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    Image processing method and apparatus with error diffusion
    1.
    发明授权
    Image processing method and apparatus with error diffusion 失效
    具有误差扩散的图像处理方法和装置

    公开(公告)号：US5543855A

    公开(公告)日：1996-08-06

    申请号：US246720

    申请日：1994-05-20

    申请人： Osamu Yamada ,  Susumu Sugiura ,  Takeshi Makita

    发明人： Osamu Yamada ,  Susumu Sugiura ,  Takeshi Makita

    IPC分类号： G09G1/16 ,  G06T1/00 ,  G06T5/00 ,  G09G3/20 ,  G09G3/28 ,  G09G3/296 ,  G09G3/36 ,  G09G5/00 ,  H04N1/405 ,  H04N5/66 ,  H04N5/14

    CPC分类号： H04N1/4052 ,  G09G3/2059 ,  G09G2310/0224 ,  G09G3/2062

    摘要： An image processing apparatus which enables error diffusion in interlaced-scanning image data. An input unit inputs image data formed by interlaced-scanning, and an adder adds error data to the input data. A binarization circuit performs level-conversion on this data. An error calculator obtains a quantization error as error data to be diffused to other pixels. The error data is stored in first and second lines in a line buffer. When processing for one scanning line is finished, error data for the next scanning line is read out of a frame buffer and stored into the first line in the line buffer, and the error data stored in the second line in the line buffer is stored at a corresponding position in the frame buffer, then the second line is cleared.

    摘要翻译： 一种在隔行扫描图像数据中能够进行误差扩散的图像处理装置。 输入单元输入通过隔行扫描形成的图像数据，并且加法器将错误数据添加到输入数据。 二值化电路对该数据执行电平转换。 误差计算器获得量化误差作为要扩散到其他像素的误差数据。 错误数据存储在行缓冲区中的第一行和第二行中。 当完成对一条扫描线的处理时，从帧缓冲器中读出下一条扫描行的错误数据并将其存储在行缓冲器中的第一行中，并将存储在行缓冲器中的第二行的错误数据存储在 帧缓冲区中的相应位置，则第二行被清除。

    Reducing the effects of noise in level number transformation
    3.
    发明授权
    Reducing the effects of noise in level number transformation 失效
    降低噪声在水平数转换中的影响

    公开(公告)号：US5621476A

    公开(公告)日：1997-04-15

    申请号：US464367

    申请日：1995-06-05

    申请人： Takeshi Makita ,  Susumu Sugiura ,  Osamu Yamada

    发明人： Takeshi Makita ,  Susumu Sugiura ,  Osamu Yamada

    IPC分类号： G09G1/16 ,  G06T5/00 ,  G09G5/00 ,  H04N1/405 ,  H04N5/213 ,  H04N5/21

    CPC分类号： H04N1/4052 ,  H04N5/213

    摘要： An image processing apparatus prevents an increase in random noise and the like produced by distributing a transformation error, which is produced at the time of a level-number transformation, to unprocessed pixel data. Error data X.sub.n is added to pixel data, which has entered via an input unit, by an adder. Thereafter, the resulting data is subjected to a level-number transformation by a binarizing circuit. Transformation error produced at the time of the level-number transformation is calculated by an error arithmetic unit. The transformation error thus calculated is distributed to unprocessed pixel data by an error-diffusion unit, and the error is accumulated in a line buffer memory as error data. When processing of a prescribed number of lines has ended, a line-number discriminating circuit clears the error data that has been accumulated in the line buffer memory. As a result, an increase in random noise is prevented.

    摘要翻译： 图像处理装置防止通过将在电平数转换时产生的变换误差分配给未处理的像素数据而产生的随机噪声等的增加。 误差数据Xn被加到通过输入单元输入的像素数据中。 此后，通过二值化电路对所得数据进行电平数转换。 在电平数转换时产生的变形误差由误差运算单元计算。 这样计算的变换误差通过误差扩散单元分配给未处理的像素数据，并且该错误被累积在行缓冲存储器中作为错误数据。 当规定数量的线路的处理已经结束时，线路识别电路清除已经积累在行缓冲存储器中的错误数据。 结果，防止了随机噪声的增加。

    Image processing method and apparatus
    4.
    发明授权
    Image processing method and apparatus 失效
    图像处理方法和装置

    公开(公告)号：US5463478A

    公开(公告)日：1995-10-31

    申请号：US243929

    申请日：1994-05-17

    申请人： Takeshi Makita ,  Susumu Sugiura ,  Osamu Yamada

    发明人： Takeshi Makita ,  Susumu Sugiura ,  Osamu Yamada

    IPC分类号： G09G1/16 ,  G06T5/00 ,  G09G5/00 ,  H04N1/405 ,  H04N5/213 ,  H04N1/409

    CPC分类号： H04N1/4052 ,  H04N5/213

    摘要： An image processing apparatus prevents an increase in random noise and the like produced by distributing a transformation error, which is produced at the time of a level-number transformation, to unprocessed pixel data. Error data X.sub.n is added to pixel data, which has entered via an input unit, by an adder. Thereafter, the resulting data is subjected to a level-number transformation by a binarizing circuit. Transformation error produced at the time of the level-number transformation is calculated by an error arithmetic unit. The transformation error thus calculated is distributed to unprocessed pixel data by an error-diffusion unit, and the error is accumulated in a line buffer memory as error data. When processing of a prescribed number of lines has ended, a line-number discriminating circuit clears the error data that has been accumulated in the line buffer memory. As a result, an increase in random noise is prevented.

    摘要翻译： 图像处理装置防止通过将在电平数转换时产生的变换误差分配给未处理的像素数据而产生的随机噪声等的增加。 误差数据Xn被加到通过输入单元输入的像素数据中。 此后，通过二值化电路对所得数据进行电平数转换。 在电平数转换时产生的变形误差由误差运算单元计算。 这样计算的变换误差通过误差扩散单元分配给未处理的像素数据，并且该错误被累积在行缓冲存储器中作为错误数据。 当规定数量的线路的处理已经结束时，线路识别电路清除已经积累在行缓冲存储器中的错误数据。 结果，防止了随机噪声的增加。