Systems and methods for removing defects from images

摘要

A method is described to increase the efficiency of the removal of defects from document images by reorienting the conceptual framework within which an image is filtered. Rather than arbitrarily applying a filter to an entire landscape of a document image, the disclosure describes a methodology by which a document image is separated into regions of darkness and regions of light, or viewed alternatively, regions of darkness and regions of lack of darkness. Filtering is then adaptively applied to each region to remove defects.

主权项

1. A computer implemented method for adaptive binarization to remove a defect from an image, the method comprising:
receiving image data; grouping the image data into a plurality of components, wherein each of the components comprises a plurality of bit groupings; identifying, in the plurality of components, at least a first data type and a second data type; and processing the plurality of components to remove the at least one defect, wherein each bit group of the first data type is compared to a first threshold value and the bit group is set to a first color value if the number exceeds the first threshold value and the bit group is set to a second color value if the number does not exceed the first threshold value.