Biomedical Engineering Reference
In-Depth Information
16
Color-Sensitive Biosensors for Imaging Applications
Lasse Lensu, Michael Frydrych, Jussi Parkkinen, Sinikka Parkkinen, and Timo
Jaaskelainen
CONTENTS
16.1 Introduction ....................................................................................................................437
16.2 Bacteriorhodopsin in Imaging Applications ..............................................................438
16.3 What is Color? ................................................................................................................439
16.3.1 Origin of Color Vision ......................................................................................440
16.3.2 Evaluation of Accuracy and Acuteness ........................................................440
16.4 Model of the Color-Vision System ..............................................................................441
16.4.1 Photosensitive Layer ........................................................................................442
16.4.2 Preprocessing Layer ........................................................................................443
16.5 Imaging with Bacteriorhodopsin ..................................................................................443
16.5.1 Gray-Scale Imaging Array ..............................................................................444
16.5.2 Color-Sensitive Imaging Array ......................................................................445
16.5.3 Electronics ..........................................................................................................445
16.5.3.1 Photosensor Electronics ..................................................................445
16.5.3.2 Imaging Array Electronics ..............................................................447
16.5.4 Measurements ..................................................................................................448
16.5.4.1 Sensitivity to Pulsing Frequency ..................................................451
16.5.5 Results ................................................................................................................452
16.5.6 SOM ....................................................................................................................453
16.5.7 Imaging Spectral Scenes ..................................................................................455
16.6 Conclusions ......................................................................................................................455
References ....................................................................................................................................459
16.1
Introduction
Computers are being increasingly used to process visual information in the digital form.
The amount of data processing has rapidly increased due to the introduction of digital
cameras and scanning devices. In contrast, future computers are expected to have more
intuitive user interfaces, and there are complex problems that cannot be solved even using
state-of-the-art computers. All of these factors generate a constant need for more power-
ful information-processing devices.
437
