METHOD AND SYSTEM FOR MEASURING TEXT-RENDERING QUALITY
First Claim
1. A method that assesses character-rendering quality, the method comprising:
- transmitting a test-character set of test characters to a character-rendering device for rendering;
intercepting digital pixel-based character maps for the test characters of the test-character set, used by the character-rendering device for rendering the test characters, to serve as an input-character set of input characters;
capturing test characters rendered by the character-rendering device to serve as an output-character set of output characters;
for each input character ci, generating and storing in a computer-readable memory one or more metrics that reflect differences between the input characters and the output characters; and
outputting one or more indications of character-rendering quality based on the one or more metrics.
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Accused Products
Abstract
Method embodiments of the present invention provide for semi-automated or fully automated assessment of the quality of device-rendered text, including graphical symbols, characters, and other printable or displayable patterns. Method embodiments of the present invention employ one or more metrics that involve the comparison of input characters, including text characters, symbols, and character-like graphics, with corresponding digital output characters obtained by capturing images of characters rendered by a character-rendering device. The one or more metrics include individual computed relative entropy APQi metrics, reflective of differences in character-to-character distance distributions between one input character c, and the set of input characters c*, a cumulative computed relative entropy APQ, stroke irregularity, contrast measure, sharpness, and background uniformity. These individual metrics can be computed and stored separately as well as output to a user of a character-rendering-quality measurement system, or may be combined together in various ways to produce one or more comprehensive, cumulative metrics for storage and output.
13 Citations
20 Claims
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1. A method that assesses character-rendering quality, the method comprising:
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transmitting a test-character set of test characters to a character-rendering device for rendering; intercepting digital pixel-based character maps for the test characters of the test-character set, used by the character-rendering device for rendering the test characters, to serve as an input-character set of input characters; capturing test characters rendered by the character-rendering device to serve as an output-character set of output characters; for each input character ci, generating and storing in a computer-readable memory one or more metrics that reflect differences between the input characters and the output characters; and outputting one or more indications of character-rendering quality based on the one or more metrics. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13)
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14. A system that includes a character-rendering-quality-assessment component, the character-rendering-quality-assessment component assessing the character-rendering quality of a character-rendering device or component by:
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transmitting a test-character set of test characters to a character-rendering device for rendering; intercepting digital pixel-based character maps for the test characters of the test-character set, used by the character-rendering device for rendering the test characters, to serve as an input-character set of input characters; capturing test characters rendered by the character-rendering device to serve as an output-character set of output characters; for each input character ci, generating and storing in a computer-readable memory one or more metrics that reflect differences between the input characters and the output characters; and outputting one or more indications of character-rendering quality based on the one or more metrics. - View Dependent Claims (15, 16, 17, 18, 19, 20)
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Specification