Quantifying color changes of chemical test pads induced concentrations of biological analytes under different lighting conditions
First Claim
Patent Images
1. A method for quantifying color change of at least one test medium on a diagnostic instrument, the method comprising:
- with a digital camera, capturing a digital image of at least a portion of the diagnostic instrument that has been exposed to a biological sample, the diagnostic instrument comprising at least one color reference including a plurality of reference samples of different colors and a plurality of test medium respectively having a plurality of reagents, each reagent changing color in response to concentration of a particular analyte in the biological sample;
identifying at least one reference sample of the plurality of reference samples for at least one of the plurality of test medium in the diagnostic instrument;
determining a dominant camera-captured color of the at least one reference sample and a dominant camera-captured color of the at least one test medium;
correcting the dominant camera-captured color of the at least one test medium, based on a color correction factor derived at least in part from the dominant camera-captured color of the at least one reference sample, to determine a corrected test medium color;
performing a plurality of comparisons of the corrected test medium color to a plurality of different sets of possible test medium colors corresponding to predetermined analyte concentrations to determine a plurality of potential test results, wherein each of the different sets of possible test medium colors is responsive to a different lighting condition; and
selecting a test result including an analyte concentration of the biological sample out of the plurality of potential test results in response to a measurement having a highest level of confidence.
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Abstract
Color quantification of chemical test pads and titration of analytes can be performed under different lighting conditions. In one embodiment, the lighting condition is estimated under which a digital image is captured and utilized to select a set of reference colors from which the quantified color is compared to determine the titration. In another embodiment, a plurality of comparisons are made with different lighting conditions with the result having the highest confidence level being selected to determine the titration.
119 Citations
20 Claims
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1. A method for quantifying color change of at least one test medium on a diagnostic instrument, the method comprising:
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with a digital camera, capturing a digital image of at least a portion of the diagnostic instrument that has been exposed to a biological sample, the diagnostic instrument comprising at least one color reference including a plurality of reference samples of different colors and a plurality of test medium respectively having a plurality of reagents, each reagent changing color in response to concentration of a particular analyte in the biological sample; identifying at least one reference sample of the plurality of reference samples for at least one of the plurality of test medium in the diagnostic instrument; determining a dominant camera-captured color of the at least one reference sample and a dominant camera-captured color of the at least one test medium; correcting the dominant camera-captured color of the at least one test medium, based on a color correction factor derived at least in part from the dominant camera-captured color of the at least one reference sample, to determine a corrected test medium color; performing a plurality of comparisons of the corrected test medium color to a plurality of different sets of possible test medium colors corresponding to predetermined analyte concentrations to determine a plurality of potential test results, wherein each of the different sets of possible test medium colors is responsive to a different lighting condition; and selecting a test result including an analyte concentration of the biological sample out of the plurality of potential test results in response to a measurement having a highest level of confidence. - View Dependent Claims (2, 3, 4, 5)
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6. A system for performing diagnostic tests of a biological sample, the system comprising:
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a diagnostic instrument comprising a paddle, a color reference mounted to the paddle having a plurality of color reference samples of different colors, and a plurality of test media mounted to the paddle, the plurality of test media respectively containing reagents which change color in the presence of particular analytes in the biological sample; and a portable electronic device comprising a digital camera sensor for capturing a digital image of at least a portion of the diagnostic instrument, and a processor configured to; identify at least one of the plurality of color reference samples and at least one of the plurality of test media in the digital image of the diagnostic instrument; determine a dominant camera-captured color of a reference sample and a dominant camera-captured color of at least one test medium; correct the dominant camera-captured color of the at least one test medium based on a color correction factor derived at least in part from the dominant camera-captured color of the reference sample to determine a corrected test medium color; compare the corrected test medium color to a plurality of different sets of possible test medium colors corresponding to predetermined analyte concentrations to determine a plurality of potential test results, wherein each of the different sets of possible test medium colors is responsive to a different lighting condition; and select a test result including an analyte concentration of the biological sample out of the plurality of potential test results in response to a measurement having a highest level of confidence. - View Dependent Claims (7, 8, 9, 10, 11)
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12. A portable electronic device for analyzing a digital image of a diagnostic instrument, the portable electronic device comprising:
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at least one processor to execute program instructions; at least one display device coupled in communication with the at least one processor; at least one digital camera sensor coupled in communication with the at least one processor; and at least one computer-readable medium coupled in communication with the at least one processor, the at least one computer-readable medium comprising program instructions that, when executed by the at least one processor, cause the portable electronic device to; capture a digital image of at least a portion of the diagnostic instrument, which has been exposed to a biological sample, with the camera sensor, the diagnostic instrument comprising at least one color reference comprising a plurality of reference samples of different colors and at least one test medium containing a reagent, which changes color in the presence of particular analytes in the biological sample; identify, in the digital image, at least one of the reference samples for the at least one test medium of the diagnostic instrument; determine, in the digital image, a dominant camera-captured color of the at least one reference sample and a dominant camera-captured color of the at least one test medium; correct the dominant camera-captured color of the at least one test medium based on a color correction factor derived at least in part from the dominant camera-captured color of the at least one reference sample to determine a corrected test medium color; and perform a plurality of comparisons of the corrected test medium color to a plurality of different sets of possible test medium colors corresponding to predetermined analyte concentrations to determine a plurality of potential test results, wherein each of the different sets of possible test medium colors is responsive to a different lighting condition; and select a test result including an analyte concentration of the biological sample out of the plurality of potential test results in response to a measurement having a highest level of confidence. - View Dependent Claims (13, 14, 15, 16, 17, 18, 19, 20)
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Specification