Vision assistance using mobile telephone
First Claim
1. A method of identifying a value of a bank note using a portable telephone with a built-in camera, the method comprising:
- capturing an image of the bank note;
converting the image of the bank note to a black and white image;
locating a numeric value printed on the bank note in the image;
dividing the numeric value into a plurality of vertical lines;
identifying a vertical line that includes only white pixels as an end of a first digit in the numeric value;
determining a number of transitions between black and white in each of a plurality of vertical lines corresponding to the first digit;
calculating an average number of transitions between white and black for the plurality of vertical lines corresponding to the first digit; and
identifying the first digit based on the average number of transitions.
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Accused Products
Abstract
Methods and system for providing vision assistance using a portable telephone with a built-in camera. In some embodiments, the system identifies the value of a bank note by determining the average number of transitions between black and white in each vertical line of pixels corresponding to a numeric digit. In other embodiments, the system captures an image and identifies an object in the image by comparing the value of each pixel in the image to a threshold intensity and marking the pixels that exceed the threshold. The system then generates a plurality of candidate groups by grouping marked pixels that are within a predetermined distance from other marked pixels. The object is identified based on the relative position of each candidate group to other candidate groups.
33 Citations
9 Claims
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1. A method of identifying a value of a bank note using a portable telephone with a built-in camera, the method comprising:
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capturing an image of the bank note; converting the image of the bank note to a black and white image; locating a numeric value printed on the bank note in the image; dividing the numeric value into a plurality of vertical lines; identifying a vertical line that includes only white pixels as an end of a first digit in the numeric value; determining a number of transitions between black and white in each of a plurality of vertical lines corresponding to the first digit; calculating an average number of transitions between white and black for the plurality of vertical lines corresponding to the first digit; and identifying the first digit based on the average number of transitions. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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Specification