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1. 发明申请

US20060023259A1 Halftone detection and removal 失效
标题翻译：半色调检测和去除
公开(公告)号：US20060023259A1
公开(公告)日：2006-02-02
申请号：US11174590
申请日：2005-07-06
申请人： Timothy Wark , James Besley , James Andrew
发明人： Timothy Wark , James Besley , James Andrew
IPC分类号： H04N1/40 , G06K15/00
CPC分类号： H04N1/40075
摘要： Methods, computer program products and apparatuses are disclosed for processing images to detect and/or remove halftone. In one aspect, a portion of an image comprising a plurality of colour channels is selected for processing (210), a frequency domain representation of the selected portion is generated for each colour channel (220), data relating to predetermined regions in the frequency domain representations is processed (230), and halftone present in the selected portion is detected based on a result of the processing the data (240). In another aspect, an image is arranged into a plurality of bands each comprising a predetermined number of consecutive lines of pixels, each of the plurality of bands is arranged into a plurality of tiles of pixels, one of the plurality of tiles is selected as a selected portion, data relating to the selected portion is processed and halftone present in the selected portion is detected based on a result of the processing and on a result of processing at least one other portion of the image. Halftone may be detected based on spatial characteristics or frequency characteristics within the selected portion and detected halftone may be removed from spatial domain data or frequency domain data relating to the selected portion.
摘要翻译：公开了用于处理图像以检测和/或去除半色调的计算机程序产品和装置的方法。在一个方面，选择包括多个颜色通道的图像的一部分用于处理（210），为每个颜色通道（220）生成所选部分的频域表示，与频域中的预定区域有关的数据处理表示（230），并且基于处理数据（240）的结果来检测存在于所选部分中的半色调。在另一方面，图像被布置成多个频带，每个频带包括预定数量的连续行像素，多个频带中的每一个被排列成多个像素块，多个图块之一被选择为对所选择的部分进行处理，并且基于处理的结果以及处理图像的至少另一部分的结果来检测存在于所选部分中的半色调的数据。可以基于所选部分内的空间特性或频率特性来检测半色调，并且可以从相关于所选部分的空间域数据或频域数据中去除所检测的半色调。

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