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公开(公告)号：US20120093434A1
公开(公告)日：2012-04-19
申请号：US13259232
申请日：2009-06-05
申请人： Serene Banerjee , Noushath Shaffi , Pulkit Parikh
发明人： Serene Banerjee , Noushath Shaffi , Pulkit Parikh
CPC分类号： G06K9/38 , G06K9/3283 , G06K9/4609 , G06K2209/01 , G06T7/13 , G06T7/136 , G06T2207/20016
摘要： An edge detection method and apparatus is disclosed. The method comprises the steps of: calculating a pixel gradient value for each of a plurality of pixels of a digital image, the pixel gradient value representing the difference of a pixel value with respect to at least one neighbouring pixel; for each of a plurality of binarization threshold values, determining a corresponding edge map representing the location of pixel gradient values exceeding the binarization threshold value with respect to a side of the digital image; for each edge map, computing a measure of linearity; determining an optimal binarization threshold value based on the computed measures of linearity; and selecting the edge map corresponding to the optimal binarization threshold value.
摘要翻译： 公开了一种边缘检测方法和装置。 该方法包括以下步骤：为数字图像的多个像素中的每一个计算像素梯度值，所述像素梯度值表示像素值相对于至少一个相邻像素的差值; 对于多个二值化阈值中的每一个，确定相对于数字图像的一侧表示超过二值化阈值的像素梯度值的位置的对应边缘图; 对于每个边缘图，计算线性度量; 基于计算的线性度量确定最优二值化阈值; 并选择与最佳二值化阈值对应的边缘图。
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公开(公告)号：US08559748B2
公开(公告)日：2013-10-15
申请号：US13259232
申请日：2009-06-05
申请人： Serene Banerjee , Noushath Shaffi , Pulkit Parikh
发明人： Serene Banerjee , Noushath Shaffi , Pulkit Parikh
CPC分类号： G06K9/38 , G06K9/3283 , G06K9/4609 , G06K2209/01 , G06T7/13 , G06T7/136 , G06T2207/20016
摘要： An edge detection method and apparatus is disclosed. The method comprises the steps of: calculating a pixel gradient value for each of a plurality of pixels of a digital image, the pixel gradient value representing the difference of a pixel value with respect to at least one neighboring pixel; for each of a plurality of binarization threshold values, determining a corresponding edge map representing the location of pixel gradient values exceeding the binarization threshold value with respect to a side of the digital image; for each edge map, computing a measure of linearity; determining an optimal binarization threshold value based on the computed measures of linearity; and selecting the edge map corresponding to the optimal binarization threshold value.
摘要翻译： 公开了一种边缘检测方法和装置。 该方法包括以下步骤：为数字图像的多个像素中的每一个计算像素梯度值，所述像素梯度值表示像素值相对于至少一个相邻像素的差值; 对于多个二值化阈值中的每一个，确定相对于数字图像的一侧表示超过二值化阈值的像素梯度值的位置的对应边缘图; 对于每个边缘图，计算线性度量; 基于计算的线性度量确定最优二值化阈值; 并选择与最佳二值化阈值对应的边缘图。
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公开(公告)号：US20120106844A1
公开(公告)日：2012-05-03
申请号：US13382097
申请日：2009-07-02
申请人： Sitaram Ramachandrula , Serene Banerjee , Pulkit Parikh , Noushath Shaffi , Anjaneyulu Seetha Rama Kuchibhotla , Prasenjit Dey
发明人： Sitaram Ramachandrula , Serene Banerjee , Pulkit Parikh , Noushath Shaffi , Anjaneyulu Seetha Rama Kuchibhotla , Prasenjit Dey
CPC分类号： H04N1/3878 , G06K9/3283 , G06K9/4633 , G06K9/4647 , G06K2209/01 , G06T7/12 , G06T7/194 , G06T7/70 , G06T2207/20061 , G06T2207/30176
摘要： Presented is a skew detection apparatus. In one form, the apparatus estimates skew based on the locations of a set of foreground content pixels or a set of edge pixels that are nearest to the side of an image of a document. In another form, the apparatus includes a skew estimation unit adapted to estimate skew based on the orientation of foreground or background content in the interior of a document. In another form, the apparatus estimates skew using segments of an image of a document. Also presented is a document image processing apparatus including the skew detection apparatus.
摘要翻译： 提出了一种偏斜检测装置。 在一种形式中，该装置基于一组前景内容像素或最靠近文档图像边缘的一组边缘像素的位置来估计偏差。 在另一种形式中，该装置包括一个歪斜估计单元，用于基于文档内部的前景或背景内容的方向来估计偏差。 在另一种形式中，设备使用文档图像的段来估计偏斜。 还提出了一种包括歪斜检测装置的文件图像处理装置。
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公开(公告)号：US09160885B2
公开(公告)日：2015-10-13
申请号：US13382097
申请日：2009-07-02
申请人： Sitaram Ramachandrula , Serene Banerjee , Pulkit Parikh , Noushath Shaffi , Anjaneyulu Seetha Rama Kuchibhotla , Prasenjit Dey
发明人： Sitaram Ramachandrula , Serene Banerjee , Pulkit Parikh , Noushath Shaffi , Anjaneyulu Seetha Rama Kuchibhotla , Prasenjit Dey
CPC分类号： H04N1/3878 , G06K9/3283 , G06K9/4633 , G06K9/4647 , G06K2209/01 , G06T7/12 , G06T7/194 , G06T7/70 , G06T2207/20061 , G06T2207/30176
摘要： Presented is a skew detection apparatus. In one form, the apparatus estimates skew based on the locations of a set of foreground content pixels or a set of edge pixels that are nearest to the side of an image of a document. In another form, the apparatus includes a skew estimation unit adapted to estimate skew based on the orientation of foreground or background content in the interior of a document. In another form, the apparatus estimates skew using segments of an image of a document. Also presented is a document image processing apparatus including the skew detection apparatus.
摘要翻译： 提出了一种偏斜检测装置。 在一种形式中，该装置基于一组前景内容像素或最靠近文档图像边缘的一组边缘像素的位置来估计偏差。 在另一种形式中，该装置包括一个歪斜估计单元，用于基于文档内部的前景或背景内容的方向来估计偏差。 在另一种形式中，设备使用文档图像的段来估计偏斜。 还提出了一种包括歪斜检测装置的文件图像处理装置。
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