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US 8,879,120 B2Granted
Systems and methods for mobile image capture and processing
AssigneeKofax, Inc.
InventorsChristopher W. Thrasher, Anthony Macciola, Alexander Shustorovich
Life of this patent
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Abstract
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.
Claims8
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, and
- SB2 is less than a predetermined blurred transition threshold;
- and
- determining, 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;
- and
- determining that a non-blank section is blurred in the second direction upon determining that r2 is less than the predefined section blur ratio threshold;
- and
- determining that a non-blank section is bluffed upon determining one or more of:
- the section is blurred in the first direction, and
- the 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.
29 more elements
A system, comprising:
- a processor configured to execute logic;
- logic for 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;
- logic for determining whether the section contains one or more sharp pixel-to-pixel transitions in a first direction;
- logic for counting a total number of first direction sharp pixel-to-pixel transitions for the section (SS1);
- logic for determining whether the section contains one or more blurred pixel-to-pixel transitions in the first direction;
- logic for counting a total number of first-direction blurred pixel-to-pixel transitions for the section (SB1);
- logic for determining whether the section contains one or more sharp pixel-to-pixel transitions in a second direction;
- logic for counting a total number of second direction sharp pixel-to-pixel transitions for the section (SS2);
- logic for determining whether the section contains one or more blurred pixel-to-pixel transitions in the second direction;
- logic for counting a total number of second-direction blurred pixel-to-pixel transitions for the section (SB2);
- logic for 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, and
- SB2 is less than a predetermined blurred transition threshold;
- and
- logic for determining, for all non-blank sections, a first direction blur ratio r1=SS1/SB1;
- logic for determining, for all non-blank sections, a second direction blur ratio r2=SS2/SB2;
- logic for 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;
- and
- logic for determining that a non-blank section is blurred in the second direction upon determining that r2 is less than the predefined section blur ratio threshold;
- and
- logic for determining that a non-blank section is blurred upon determining one or more of:
- the section is blurred in the first direction;
- and
- the section is blurred in the section direction;
- and
- logic for determining a total number of blurred sections;
- logic for calculating an image blur ratio R comprising:
- the total number blurred sections to a total number of sections;
- and
- logic for determining the digital image is blurred upon determining the image blur ratio is greater than a predetermined image blur threshold.
29 more elements
A computer program product comprising a non-transitory computer readable storage medium having computer readable program code stored thereon, the computer readable program code comprising:
- computer readable program code configured to divide, 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
- computer readable program code configured to determine whether the section contains one or more sharp pixel-to-pixel transitions in a first direction;
- computer readable program code configured to count a total number of first direction sharp pixel-to-pixel transitions for the section (SS1);
- computer readable program code configured to determine whether the section contains one or more blurred pixel-to-pixel transitions in the first direction;
- computer readable program code configured to count a total number of first-direction blurred pixel-to-pixel transitions for the section (SB1);
- computer readable program code configured to determine whether the section contains one or more sharp pixel-to-pixel transitions in a second direction;
- computer readable program code configured to count a total number of second direction sharp pixel-to-pixel transitions for the section (SS2);
- computer readable program code configured to determine whether the section contains one or more blurred pixel-to-pixel transitions in the second direction;
- computer readable program code configured to count a total number of second-direction blurred pixel-to-pixel transitions for the section (SB1);
- computer readable program code configured to determine 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, and
- SB2 is less than a predetermined blurred transition threshold;
- and
- computer readable program code configured to determine, for all non-blank sections, a first direction blur ratio r1=SS1/SB1;
- computer readable program code configured to determine, for all non-blank sections, a second direction blur ratio r2=SS2/SB2;
- computer readable program code configured to determine that a non-blank section is blurred in the first direction upon determine that r1 is less than a predefined section blur ratio threshold;
- and
- computer readable program code configured to determine that a non-blank section is blurred in the second direction upon determine that r2 is less than the predefined section blur ratio threshold;
- and
- computer readable program code configured to determine that a non-blank section is blurred upon determine one or more of:
- the section is blurred in the first direction;
- and
- the section is blurred in the section direction;
- and
- computer readable program code configured to determine a total number of blurred sections;
- computer readable program code configured to calculate an image blur ratio R comprising:
- the total number blurred sections to a total number of sections;
- and
- computer readable program code configured to determine the digital image is blurred upon determine the image blur ratio is greater than a predetermined image blur threshold.
28 more elements
Dependencies are inferred from the claim text.