公开(公告)号：US08462390B2

公开(公告)日：2013-06-11

申请号：US13124708

申请日：2009-10-19

申请人： Haifeng Li ,  Shixiong Ma ,  Bin Yang ,  Lidong Wang

发明人： Haifeng Li ,  Shixiong Ma ,  Bin Yang ,  Lidong Wang

IPC分类号： H04N1/52

CPC分类号： H04N1/52

摘要： An image processing method includes: generating a stochastic screening dither matrix (S101); performing a centered positive-negative conversion operation on the stochastic screening dither matrix (S102); generating a screen dot dither contrast matrix for each color surface according to the stochastic screening dither matrix after being subjected to the positive-negative conversion operation and a stochastic screening dither threshold set for each color surface of an image; performing a logical “and” operation between each data item in a one-bit amplitude modulation screen dot matrix of each color surface of the image and a data item at a corresponding position in the screen dot dither contrast matrix of the color surface, and using a result as a processed value of a corresponding data item in the one-bit amplitude modulation screen dot matrix of the color surface. An apparatus corresponding to the image processing method is also provided. According to the above-described image processing method and apparatus, the problem in the prior art of an excess of pure-color pixels existing in an original one-bit dot matrix can be resolved.

摘要翻译： 一种图像处理方法包括：产生随机筛选抖动矩阵（S101）; 对随机筛选抖动矩阵执行中心正负转换操作（S102）; 根据随机筛选抖动矩阵在进行正负转换操作之后产生每个颜色表面的屏幕点抖动对比度矩阵，以及为图像的每个颜色表面设置的随机屏蔽抖动阈值; 在图像的每个颜色表面的一位幅度调制屏幕点阵中的每个数据项之间执行逻辑“和”操作，以及在颜色表面的屏幕点抖动对比矩阵中的相应位置处的数据项，并且使用 作为颜色表面的一位幅度调制屏幕点阵中的相应数据项的处理值的结果。 还提供了与图像处理方法对应的装置。 根据上述图像处理方法和装置，可以解决现有技术中存在于原始一位点阵中的纯色像素的过剩问题。

公开(公告)号：US20110279872A1

公开(公告)日：2011-11-17

申请号：US13124708

申请日：2009-10-19

申请人： Haifeng Li ,  Shixiong Ma ,  Bin Yang ,  Lidong Wang

发明人： Haifeng Li ,  Shixiong Ma ,  Bin Yang ,  Lidong Wang

IPC分类号： H04N1/405

CPC分类号： H04N1/52

摘要： An image processing method includes: generating a stochastic screening dither matrix (S101); performing a centered positive-negative conversion operation on the stochastic screening dither matrix (S102); generating a screen dot dither contrast matrix for each color surface according to the stochastic screening dither matrix after being subjected to the positive-negative conversion operation and a stochastic screening dither threshold set for each color surface of an image; performing a logical “and” operation between each data item in a one-bit amplitude modulation screen dot matrix of each color surface of the image and a data item at a corresponding position in the screen dot dither contrast matrix of the color surface, and using a result as a processed value of a corresponding data item in the one-bit amplitude modulation screen dot matrix of the color surface. An apparatus corresponding to the image processing method is also provided. According to the above-described image processing method and apparatus, the problem in the prior art of an excess of pure-color pixels existing in an original one-bit dot matrix can be resolved.

摘要翻译： 一种图像处理方法包括：产生随机筛选抖动矩阵（S101）; 对随机筛选抖动矩阵执行中心正负转换操作（S102）; 根据随机筛选抖动矩阵在进行正负转换操作之后产生每个颜色表面的屏幕点抖动对比度矩阵，以及为图像的每个颜色表面设置的随机屏蔽抖动阈值; 在图像的每个颜色表面的一位幅度调制屏幕点阵中的每个数据项之间执行逻辑“和”操作，以及在颜色表面的屏幕点抖动对比矩阵中的相应位置处的数据项，并且使用 作为颜色表面的一位幅度调制屏幕点阵中的相应数据项的处理值的结果。 还提供了与图像处理方法对应的装置。 根据上述图像处理方法和装置，可以解决现有技术中存在于原始一位点阵中的纯色像素的过剩问题。

公开(公告)号：US08023152B2

公开(公告)日：2011-09-20

申请号：US11912846

申请日：2005-11-02

申请人： Haifeng Li ,  Bin Yang ,  Shixiong Ma

发明人： Haifeng Li ,  Bin Yang ,  Shixiong Ma

IPC分类号： H04N1/405

CPC分类号： H04N1/4052 ,  H04N1/4055

摘要： The present invention relates to a method for producing halftone dots in the field of image hard copying, more particularly to a method for frequency-modulation screening using error diffusion based on dual-feedback. In the known frequency-modulation and amplitude-modulation screening technology, it is hard to output a halftone image with high quality using an output equipment with a low resolution (600 dpi) and the satisfactory effect of representing the gradations of the original image in detail and holding the smoothness of the original image can not be achieved. By using the dual-feedback technology based on a basic algorithm of the error distribution, the method in the present invention realizes the organic combination of the conventional frequency-modulation and amplitude-modulation screens and achieves the effect of mixed screening. The method in the present invention can effectively solve the problem of losing gradations of dots in an output equipment with low resolution and can reduce the moire caused by the random distribution characteristic so as to output halftone images with high quality and full gradations.

摘要翻译： 本发明涉及一种在图像硬拷贝领域制造半色调点的方法，更具体地说，涉及一种使用基于双重反馈的误差扩散进行频率调制筛选的方法。 在已知的调频和幅度调制技术中，使用低分辨率（600dpi）的输出设备输出具有高品质的半色调图像是困难的，并且具有令人满意的效果，其表示原始图像的灰度 并保持原始图像的平滑度无法实现。 通过使用基于误差分布的基本算法的双反馈技术，本发明的方法实现了常规频率调制和幅度调制屏幕的有机组合，并实现了混合筛选的效果。 本发明的方法可以有效地解决在分辨率低的输出设备中丢失点的灰度的问题，并且可以减少由随机分布特性引起的波纹，从而输出具有高质量和全等级的半色调图像。

公开(公告)号：US20080170267A1

公开(公告)日：2008-07-17

申请号：US11912846

申请日：2005-11-02

申请人： Haifeng Li ,  Bin Yang ,  Shixiong Ma

发明人： Haifeng Li ,  Bin Yang ,  Shixiong Ma

IPC分类号： H04N1/405

CPC分类号： H04N1/4052 ,  H04N1/4055

摘要： The present invention relates to a method for producing halftone dots in the field of image hard copying, more particularly to a method for frequency-modulation screening using error diffusion based on dual-feedback. In the known frequency-modulation and amplitude-modulation screening technology, it is hard to output a halftone image with high quality using an output equipment with a low resolution (600 dpi) and the satisfactory effect of representing the gradations of the original image in detail and holding the smoothness of the original image can not be achieved. By using the dual-feedback technology based on a basic algorithm of the error distribution, the method in the present invention realizes the organic combination of the conventional frequency-modulation and amplitude-modulation screens and achieves the effect of mixed screening. The method in the present invention can effectively solve the problem of losing gradations of dots in an output equipment with low resolution and can reduce the moire caused by the random distribution characteristic so as to output halftone images with high quality and full gradations.

摘要翻译： 本发明涉及一种在图像硬拷贝领域制造半色调点的方法，更具体地说，涉及一种使用基于双重反馈的误差扩散进行频率调制筛选的方法。 在已知的调频和幅度调制技术中，使用低分辨率（600dpi）的输出设备输出具有高品质的半色调图像是困难的，并且具有令人满意的效果，其表示原始图像的灰度 并保持原始图像的平滑度无法实现。 通过使用基于误差分布的基本算法的双反馈技术，本发明的方法实现了常规频率调制和幅度调制屏幕的有机组合，并实现了混合筛选的效果。 本发明的方法可以有效地解决在分辨率低的输出设备中丢失点的灰度的问题，并且可以减少由随机分布特性引起的波纹，从而输出具有高质量和全等级的半色调图像。