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12. 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。

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