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Evaluating Targeting Accuracy in the Focal Plane for an Ultrasound-guided High-intensity Focused Ultrasound Phased-array System

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Performance comparison of rectangular (four-point) and diagonal (two-point) dither in undersampled infrared focal

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|March 22, 2008

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Diagonal dither offers simpler implementation and lower data rates for undersampled imagers. However, rectangular dither provides superior image sampling and target identification performance.

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Area of Science:

Optical engineering
Image processing
Sensor technology

Background:

Undersampled staring array imagers suffer from sampling artifacts.
Dither techniques enhance spatial sampling without increasing detector count.
Diagonal dither is simpler and has lower data rates than rectangular dither.

Purpose of the Study:

To compare the performance of diagonal and rectangular dither in undersampled staring array imagers.
To evaluate the trade-offs between implementation complexity and image sampling effectiveness.
To predict and empirically validate performance differences.

Main Methods:

Analytical predictions of dither performance.
Empirical target identification (ID) experiment using a 320 x 240 pixel sensor simulation.
Comparison of static target ID performance for nondithered, diagonally dithered, and rectangularly dithered imagery.

Main Results:

Nondithered imagery exhibited poor sampling.
Rectangular dither provided adequate image sampling.
Diagonal dither showed reduced sampling effectiveness compared to rectangular dither.

Conclusions:

Rectangular dither offers superior image sampling and target identification performance over diagonal dither.
The choice between diagonal and rectangular dither involves a trade-off between system complexity and expected performance.
Empirical results support analytical predictions regarding dither effectiveness.