Systems and methods for mobile image capture and processing

摘要

In various embodiments, methods, systems, and computer program products for processing digital images captured by a mobile device are disclosed. Myriad features enable and/or facilitate processing of such digital images using a mobile device that would otherwise be technically impossible or impractical, and furthermore address unique challenges presented by images captured using a camera rather than a traditional flat-bed scanner, paper-feed scanner or multifunction peripheral.

主权项

1. A method, comprising:
dividing, using a processor, a tetragon comprising a digital representation of a document in a digital image into a plurality of sections, each section comprising a plurality of pixels; for each section:
determining whether the section contains one or more sharp pixel-to-pixel transitions in a first direction;counting a total number of first direction sharp pixel-to-pixel transitions for the section (SS1);determining whether the section contains one or more blurred pixel-to-pixel transitions in the first direction;counting a total number of first-direction blurred pixel-to-pixel transitions for the section (SB1);determining whether the section contains one or more sharp pixel-to-pixel transitions in a second direction;counting a total number of second-direction sharp pixel-to-pixel transitions for the section (SS2);determining whether the section contains one or more blurred pixel-to-pixel transitions in the second direction;counting a total number of second-direction blurred pixel-to-pixel transitions for the section (SB2);determining the section is blank upon determining:
SS1 is less than a predetermined sharp transition threshold,SB1 is less than a predetermined blurred transition threshold,SS2 is less than a predetermined sharp transition threshold, andSB2 is less than a predetermined blurred transition threshold; anddetermining, for all non-blank sections, a first direction blur ratio r1=SS1/SB1;determining, for all non-blank sections, a second direction blur ratio r2=SS2/SB2;determining that a non-blank section is blurred in the first direction upon
determining that r1 is less than a predefined section blur ratio threshold; anddetermining that a non-blank section is blurred in the second direction upon determining that r2 is less than the predefined section blur ratio threshold; anddetermining that a non-blank section is bluffed upon determining one or more of:
the section is blurred in the first direction, andthe section is blurred in the section direction; and determining a total number of blurred sections; calculating an image blur ratio R comprising: the total number blurred sections to a total number of sections; and determining the digital image is blurred upon determining the image blur ratio is greater than a predetermined image blur threshold.