Target Handing over System using Pyramid Processing .

Abstract

The image seen by the(1ow resolution (LR) sensor and the image (of the same scene) seen by the operator through the high resolution (HR) sensor are different in spatial resolution. To establish the correlation between these two images, the HR image needs to be resampled and made similar to the LR sensor image by applying a'pre-processing technique. The pre-processing will be carried out by handing over system that resampies the HK sensor image making it compatible with LR sensor image and hands over the resampled image to the LR sensor through a serial link. The pre-processing technique reported by ~o l a n d ' has been studied, analysed2 and implemented3 using 86 family of processors. Automatic target handing over system discusses the implementation of pre-processing technique, computational complexity and criticality of the execution time. The execution time reported was 1.5 s, whereas the requirement is of the order of few milliseconds for the typical set of conditions. This paper discusses the implementation of a suitable handing over algorithm1 Emphasis has been to develop hardware and software to reduce the execution time, which has been brought down from 1.5 s to 40 ms for a typical set of conditions. Emplrasis has also been given to reduce the transmission time by applying suitable pyramid processing techniques. The hardware is designed around i486 processor, and the software E v e l o p e d in PL/M86.

High speed preprocessing system

“…2X2 Study to reduce execution time A study has been carried out to determine the effect of fractional pixels on boundaries for large scaling factors (Wh and Wv). The RMS error due to neglecting partial pixels is of the order of 1 in 256 gray levels (Kishore 1999). This is because the adjacent regions in an image are highly correlated.…”

“…2X3 Coarse re-sampling A study has been carried to determine the effect of coarse re-sampling. The error due to coarse re-sampling is of the order of 1 or 2 in 256 gray levels (Kishore 1999). Even when sampling rate is 4 MHz and alternate HR lines only are considered, the RMS error is of the order of 1 or 2 gray level in 256 gray levels.…”