Litmus paper is commonly used to determine the pH level of a fluid by comparing the color of the litmus strip to a reference chart. However, some colors on the chart are similar, making visual identification difficult. The document proposes using a camera phone to take an image of the litmus strip and reference chart. An image processing program on the phone would then match the color of the strip to the chart and display the pH level on the phone screen. This automated method could help those who have trouble visually distinguishing colors, such as the elderly or colorblind individuals.

1. BPCU-034.
JAIPAL REDDY*,GOUTHAM REDDY
VISHNU INSTITUTE OF PHARMACEUTICAL
EDUCATION & RESEARCH,
Vishnupur, Narsapur, Medak District – 502313
.

2. Litmus papers are widely used by medical professionals and
consumers to determine the ph level by dipping a ph strip in fluid
The ph level is indicated by color change on test strip. By visually
comparing the strips color against a color reference ,the Ph level of
fluid under test is known.
However, some of colors in the reference chart are very similar to
each other ,which may potentially cause problem in identifying
the right ph level using human eyes .
For individuals who find it difficult or impossible to compare
the colors visually especially the elderly and color blind, we
propose a convenient solution using a camera phone - a device
that many people own and use in their daily life nowadays

3. An image of the pH test strip and the color reference
chart is first captured by a mobile camera phone. The image
processing unit (IPU) running on the J2ME enabled mobile
phone that supports the MMAPI extension classifies the pH
level by matching the color of the pH test strip with one of
the colors on the reference chart. The result of the
automatically identified pH level is displayed on the phone.
At the same time ,the ph result can be stored in the phone or
transmitted to doctors to seek further medical attention if
necessary
This tool is particularly helpful for colorblind
patients and elderly people with poor eye sight.