This document describes a portable color detector application created by Sridhar Mamella. The application uses digital image processing techniques like gray balancing, neutral balancing, and white balancing to calibrate images from a device camera. It then applies k-means clustering to detect and identify colors in the images and display color names. The application was created using the Android SDK and interfaces with the device camera to function on a mobile platform.

1. *The Android robot is reproduced and modified from work created and shared by
Google and used according to terms described in the Creative Commons 3.0
Attribution License.
*
Portable Colour Detector
Sridhar Mamella
BEng (Hons) Computers and Electronics | Academic Year - 2013 | 2014
Introduction
A method for detecting colours using a portable device with
calibration techniques such as Auto White Balance (AWB)
was devised.
Results
Digital Image Processing
• Gray Balance
• Neutral Balance
• White Balance
• K-means algorithm
Android SDK
• Eclipse + ADT plugin
• Android SDK Tools
• Android system image emulator
App
• Interfaced Camera
• RGB Values + more
• Displays colour names
• Combine versions
Initialising representatives (means)
Final App Layout
Initialise means:
• By picking k samples at random
Iterate:
• Assign each point to nearest mean
• Move “mean” to center of its cluster.
Conclusion
• A method for detecting colours using a portable device
with calibration techniques was achieved.
• Camera interfacing and digital signal processing
techniques were applied.
• Furthermore, k-means clustering was computed and
incorporated into a mobile device.
Features
• Colour detection
• Image calibration
• Identification of RGB values
• Colour storage
Android's Camera HAL overview
Android's camera Hardware Abstraction Layer (HAL)
connects the higher level camera framework APIs in android
hardware to a underlying camera driver and hardware. The
following figure describes the components involved.
Future Work
• Test more algorithms on a mobile device.
• Update colour library.
Architecture Summary