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1. 发明授权

US06222945B1 Selective filtering of a dithered image for the purpose of inverse dithering 失效
标题翻译：用于反向抖动的抖动图像的选择性滤波
公开(公告)号：US06222945B1
公开(公告)日：2001-04-24
申请号：US09016317
申请日：1998-01-30
申请人： Shiufun Cheung , Robert A. Ulichney , Robert MacNamara , Giridharan Iyengar
发明人： Shiufun Cheung , Robert A. Ulichney , Robert MacNamara , Giridharan Iyengar
IPC分类号： G06K940
CPC分类号： H04N1/40075
摘要： A method for selecting a filter from among a plurality of ordered filters within an inverse dithering system is disclosed. In response to receipt of a number of filter parameters associated with the plurality of ordered filters and a selected portion of a dithered image, a determination is made of the region of support for the plurality of filters from the filter parameters. From these regions of support, a lowest ordered filter having a region of support that excludes an image edge in the selected portion of the dithered image is selected.
摘要翻译：公开了一种从逆抖动系统内的多个有序滤波器中选择滤波器的方法。响应于接收到与多个有序滤波器相关联的多个滤波器参数以及抖动图像的选定部分，从滤波器参数确定对多个滤波器的支持区域。从这些支持区域中，选择具有不包括抖动图像的所选部分中的图像边缘的支持区域的最低有序滤波器。

2. 发明授权

US06347160B1 Increasing the bit depth of and filtering dithered images for the purpose of inverse dithering 失效
标题翻译：增加抖动抖动图像的位深度和滤波，以进行反向抖动
公开(公告)号：US06347160B1
公开(公告)日：2002-02-12
申请号：US09015935
申请日：1998-01-30
申请人： Shiufun Cheung , Robert A. Ulichney , Robert MacNamara
发明人： Shiufun Cheung , Robert A. Ulichney , Robert MacNamara
IPC分类号： G06K940
CPC分类号： H04N1/40075 , G06T5/20 , G06T7/13 , G06T2207/20012 , G06T2207/20192
摘要： A method for inverse dithering a dithered image using a filter selected from a set of filters arranged in a preselected order is disclosed. Upon receipt of a selected portion of a dithered image, the selected portion is up-multiplied from a first amplitude resolution to a second amplitude resolution. The up-multiplied dithered image at the second amplitude resolution is then filtered by the selected filter coefficients to generate the inverse dithered image.
摘要翻译：公开了一种使用从按预选顺序布置的一组滤波器中选择的滤波器来对抖动图像进行反抖动的方法。在接收到抖动图像的所选部分时，所选择的部分从第一幅度分辨率向第二幅度分辨率倍增。然后，通过所选择的滤波器系数对在第二幅度分辨率下的倍增抖动图像进行滤波，以产生逆抖动图像。

3. 发明授权

US06185334B2 Method for reconstructing a dithered image 失效
标题翻译：重构抖动图像的方法
公开(公告)号：US06185334B2
公开(公告)日：2001-02-06
申请号：US09015934
申请日：1998-01-30
申请人： Shiufun Cheung , Robert A. Ulichney , Robert MacNamara , Giridharan Iyengar
发明人： Shiufun Cheung , Robert A. Ulichney , Robert MacNamara , Giridharan Iyengar
IPC分类号： G06K940
CPC分类号： H04N1/40075 , G06T3/403
摘要： A method of reconstructing an image from a dithered image. A predefined set of filters having different regions of support is established. Each filter is defined by a number of filter coefficients and an impulse response function which defines the filter response for a region of support outside of which the impulse response is zero. Filters are organized according to indexes and this organization represents the order in which the filters are considered during a filter selection process. The filter selection process selects a filter constrained by the rule that the filter selected must only perform low-pass filtering on a region of support that does not contain edges of an image. Due to the organization of the filter set, the filter selection process first selects the largest filter from the filter set that fits within the region about the current processed pixel. If there is an edge of an image within the support region of the first selected filter, the next smaller filter is selected. If there is no edge in the selected smaller filter, the dithered image is reconstructed using the selected smaller filter.
摘要翻译：从抖动图像重建图像的方法。建立了具有不同支持区域的预定义的一组滤波器。每个滤波器由多个滤波器系数和脉冲响应函数定义，脉冲响应函数为脉冲响应为零之外的支持区域定义滤波器响应。过滤器根据索引进行组织，该组织表示过滤器选择过程中过滤器被考虑的顺序。过滤器选择过程选择由规则约束的过滤器，所选择的过滤器必须仅在不包含图像边缘的支持区域上执行低通滤波。由于滤波器组的组织，滤波器选择过程首先从滤波器组中选择适合当前处理像素区域内的最大滤波器。如果在第一选择的滤波器的支持区域内存在图像的边缘，则选择下一较小的滤波器。如果所选择的较小滤波器中没有边缘，则使用所选的较小滤波器重构抖动图像。

4. 发明授权

US06473525B1 Method for detecting an image edge within a dithered image 失效
标题翻译：用于检测抖动图像中的图像边缘的方法
公开(公告)号：US06473525B1
公开(公告)日：2002-10-29
申请号：US09657290
申请日：2000-09-07
申请人： Shiufun Cheung , Robert A. Ulichney , Robert MacNamara , Giridharan Iyengar
发明人： Shiufun Cheung , Robert A. Ulichney , Robert MacNamara , Giridharan Iyengar
IPC分类号： G06K940
CPC分类号： H04N1/40075 , G06T3/403
摘要： A method for detecting an image edge within a dithered image. A pixel within a support region is selected for processing. The differences between pixel values in the region and the selected pixel are computed to form a current difference map. Whether the selected pixel in the region differ by no more than one resolution level from any other pixel of the region is determined from the current difference map. An edge is determined not to exist within the region if the difference map for a region contains no values differing by more than one resolution level. An edge is determined to exist within a region if the difference map for the selected pixel and region contain values differing by more than one resolution level. Alternatively, a difference map for the selected region of support is determined and compared to a table of all possible valid difference maps. If a corresponding difference map is found within the table then an edge does not exist within the presently processed region of support. If no corresponding difference map is found within the table then an edge exists within the region of support. Alternatively, the number of valid difference maps to be compared for each region may be reduced by selecting only the difference maps based on the dither template as originally applied to the image. All valid difference maps which do not contain values based on the original dither template are excluded from comparison.
摘要翻译：一种用于检测抖动图像内的图像边缘的方法。选择支持区域内的像素进行处理。计算区域和所选像素中的像素值之间的差异以形成电流差分图。根据当前差异图确定该区域中所选择的像素是否与该区域的任何其他像素不同于一个分辨率水平。如果区域的差分图不包含多于一个分辨率级别的值，则确定该区域内不存在边。如果所选择的像素和区域的差分图包含多于一个分辨率水平的值，则确定边缘存在于区域内。或者，确定所选择的支持区域的差异图，并与所有可能的有效差异图表进行比较。如果在表内找到对应的差异图，则在当前处理的支持区域内不存在边缘。如果在表内没有找到对应的差异图，则在支持区域内存在边。或者，可以通过仅基于最初应用于图像的抖动模板选择差分图来减少每个区域要比较的有效差分图的数量。不包含基于原始抖动模板的值的所有有效差分图从比较中排除。

5. 发明授权

US6163629A Method for low complexity low memory inverse dithering 失效
标题翻译：低复杂度低内存反向抖动的方法
公开(公告)号：US6163629A
公开(公告)日：2000-12-19
申请号：US16316
申请日：1998-01-30
申请人： Shiufun Cheung , Robert A. Ulichney , Robert MacNamara , Giridharan Iyengar
发明人： Shiufun Cheung , Robert A. Ulichney , Robert MacNamara , Giridharan Iyengar
IPC分类号： H04N7/30 , G06T5/00 , H04N1/40 , H04N1/405 , G06K9/40
CPC分类号： H04N1/40075
摘要： A method and apparatus for inverse dithering a dithered image is disclosed. The system includes a plurality of digital filters which are organized according to a preselected order. A selection module enables the selection of one filter from the plurality of filters according to the preselected order to filter a presently selected portion of the dithered image. The selected portion of the dithered image is then processed based upon the selected filter to generate a portion of the inverse dithered image.
摘要翻译：公开了一种用于逆抖动抖动图像的方法和装置。该系统包括根据预选顺序组织的多个数字滤波器。选择模块使得能够根据预选顺序从多个滤波器中选择一个滤波器来对当前选择的抖动图像的部分进行滤波。然后基于所选择的滤波器来处理抖动图像的所选部分，以产生逆抖动图像的一部分。

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