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Relationship between the color features of extracted ROI and <t>free</t> <t>chlorine</t> concentration measured with the Hach sensor for the DPD powder <t>test.</t> From left to right, top to bottom: red, green, blue, hue, lightness and saturation. Error bars represent the standard deviation from pixels in the same ROI for each of the measurements.
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Relationship between the color features of extracted ROI and <t>free</t> <t>chlorine</t> concentration measured with the Hach sensor for the DPD powder <t>test.</t> From left to right, top to bottom: red, green, blue, hue, lightness and saturation. Error bars represent the standard deviation from pixels in the same ROI for each of the measurements.
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Relationship between the color features of extracted ROI and free chlorine concentration measured with the Hach sensor for the DPD powder test. From left to right, top to bottom: red, green, blue, hue, lightness and saturation. Error bars represent the standard deviation from pixels in the same ROI for each of the measurements.

Journal: Sensors (Basel, Switzerland)

Article Title: Color QR Codes for Smartphone-Based Analysis of Free Chlorine in Drinking Water

doi: 10.3390/s25113251

Figure Lengend Snippet: Relationship between the color features of extracted ROI and free chlorine concentration measured with the Hach sensor for the DPD powder test. From left to right, top to bottom: red, green, blue, hue, lightness and saturation. Error bars represent the standard deviation from pixels in the same ROI for each of the measurements.

Article Snippet: Regarding commercially available reagents to digitize, we targeted two different reagent methods that evaluated different ways to prepare samples and obtain a FC measurement: BTB strip: We used the Free Chlorine Water Check test from Sensafe ® (Industrial Test Systems, Inc., Rock Hill, SC, USA), an assay approved by United States Environmental Protection Agency.

Techniques: Concentration Assay, Standard Deviation

Different stages of the Selfytest application. ( a ) Mockup of the Selfytest application, as a Telegram bot: a prototype interface was designed to simulate the expected behavior of the final mobile application. It shows automated detection of the test area, comparison with reference color bars, and the corresponding classification of free chlorine concentration. ( b ) Screenshots of the actual Selfytest mobile application: the main menu (center) and the image acquisition stage (right), where the QR Code and the test strip are detected in real-time for colorimetric evaluation.

Journal: Sensors (Basel, Switzerland)

Article Title: Color QR Codes for Smartphone-Based Analysis of Free Chlorine in Drinking Water

doi: 10.3390/s25113251

Figure Lengend Snippet: Different stages of the Selfytest application. ( a ) Mockup of the Selfytest application, as a Telegram bot: a prototype interface was designed to simulate the expected behavior of the final mobile application. It shows automated detection of the test area, comparison with reference color bars, and the corresponding classification of free chlorine concentration. ( b ) Screenshots of the actual Selfytest mobile application: the main menu (center) and the image acquisition stage (right), where the QR Code and the test strip are detected in real-time for colorimetric evaluation.

Article Snippet: Regarding commercially available reagents to digitize, we targeted two different reagent methods that evaluated different ways to prepare samples and obtain a FC measurement: BTB strip: We used the Free Chlorine Water Check test from Sensafe ® (Industrial Test Systems, Inc., Rock Hill, SC, USA), an assay approved by United States Environmental Protection Agency.

Techniques: Comparison, Concentration Assay, Stripping Membranes