Influence of perturbations in a hybrid digital-optical correlator

Bhagatji, Alpana; Nishchal, Naveen K.; Beri, Vinod K.; Gupta, A.

doi:10.1016/j.optlaseng.2006.05.006

Cited by 4 publications

(4 citation statements)

References 21 publications

(29 reference statements)

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“…For false class image no peak is seen. 36 The effect of additive and multiplicative noise as well as their combined effect on the input target was also studied. We used imnoise command of MATLAB to add Gaussian noise of mean 'M' and variance 'V' to the target image.…”

Section: Resultsmentioning

confidence: 99%

“…This was the greater than the peak value for false class. 36 Simulation and experimental studies were performed using Abrams and Khaled tanks. The images used for filter synthesis and the synthesized filter have been shown in Figs.…”

Section: Resultsmentioning

confidence: 99%

“…With 45% occlusion of the input image, the correlation peak value of 10.22 au obtained was found to be less than the maximum false class value of 10.43 au in the entire training range. 36 For experimental study in this case a BNS SLM (BNS, USA) was used. Due to the reflective structure of this SLM, a polarizing cubic beam splitter was used to couple light between the SLM and the FT lens.…”

Section: Resultsmentioning

confidence: 99%

“…11 shows the plot for PSR versus angle of rotation for chirp-encoded WaveMACH filter. 36 To analyze the amount of tolerance to product information loss, a study on the occlusion of the product function was performed. For this, the obtained product function was occluded by an area of gray level 128 of different sizes (64 × 64, 128 × 128, 151 × 151, 181 × 181, 128 × 256 pixels or 6.25%, 25%, 35%, 50%, 50% respectively) from different positions.…”

Section: Wavelet-modified Mach Filter For In-plane Rotation Invariancementioning

confidence: 99%

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A hybrid digital-optical correlator for automatic target recognition

2007

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Detection of rotationally distorted targets is a challenging task in pattern recognition applications. Recently, we proposed and implemented a wavelet-modified maximum average correlation height (MACH) filter for in-plane and out-of-plane rotation invariance in hybrid digital-optical correlator architecture. Use of wavelet transform improved the performance of the MACH filter by reducing the number of filters required for identifying a rotated target and enhancing the correlation peak intensity significantly. The output of a hybrid digital-optical correlator contains two autocorrelation peaks and a strong dc. To capture a desired single autocorrelation peak a chirp function with the wavelet-modified MACH filter was used. The influence of perturbations in hybrid digital-optical correlator has also been studied. Perturbations include, the effect of occlusion on input target, the effect of additive and multiplicative noise and their combined effect on input target, and the effect of occlusion of product function to be optically processed for obtaining the correlation outputs. The present paper reviews investigations on the hybrid digital-optical correlation scheme with special reference to the work carried out at the Photonics Division, IRDE Dehradun.

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Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Section: Wavelet-modified Mach Filter For In-plane Rotation Invariancementioning

confidence: 99%

See 2 more Smart Citations