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    • 31. 发明授权
    • Text recognition by predictive composed shapes
    • 通过预测组合形状的文本识别
    • US5524066A
    • 1996-06-04
    • US220861
    • 1994-03-31
    • Ronald M. KaplanDaniel G. Bobrow
    • Ronald M. KaplanDaniel G. Bobrow
    • G06K9/34G06K9/00G06K9/46G06K9/62G06K9/72
    • G06K9/00G06K9/723G06K2209/01
    • A top-down technique for character text recognition of an image comprises a left-to-right analysis of each image line. A current image portion is selected. Possible text prefixes are selected from a dictionary. The upper and lower text contours of the text prefixes are compared with a bitmap of the current image portion. A distance value is generated, indicating the quality of the comparison. The prefixes are then added to an agenda of prefixes. Based on the distance value, corresponding to the similarity of the upper shapes and lower shapes of the possible prefix to the bitmap of the image portion, a list of the text prefixes generating the best distance values is selected from the agenda. From the selected list, a new list of extended text prefixes is obtained from the dictionary and added to the agenda. The process is repeated until the current image portion ends. At this point, the possible text prefix having the best total distance value is selected as the list of text characters corresponding to the image portion. The total distance value is the sum of all of the distance values of the text characters forming the text prefix. Possible text words are selected from the agenda based on beam searching techniques against either a threshold or by limiting the number of possible text prefixes selected to a predetermined number of the currently most probable text prefixes.
    • 用于图像的字符文本识别的自顶向下技术包括每个图像行的从左到右的分析。 选择当前图像部分。 从字典中选择可能的文本前缀。 将文本前缀的上下文本轮廓与当前图像部分的位图进行比较。 产生距离值,表示比较的质量。 然后将前缀添加到前缀的议程中。 基于距离值,对应于可能前缀与图像部分的位图的上部形状和下部形状的相似度,从议程中选择产生最佳距离值的文本前缀的列表。 从所选列表中,从字典获取扩展文本前缀的新列表,并将其添加到议程中。 重复该过程直到当前图像部分结束。 此时,选择具有最佳总距离值的可能的文本前缀作为对应于图像部分的文本字符的列表。 总距离值是形成文本前缀的文本字符的所有距离值的总和。 基于针对阈值的波束搜索技术从可选文本词中选择可能的文本词,或通过限制被选择到预定数量的当前最可能的文本前缀的可能的文本前缀的数量。