High-speed high-precision CMOS analog rank order filter with O(n) complexity

Carvajal, R.G.; Ramírez-Angulo, J.; Ducoudray, G.O.; Lopez-Martin, A.J.

doi:10.1109/jssc.2005.848025

Cited by 8 publications

(7 citation statements)

References 22 publications

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“…Another technique is used in [11] and [13], where three-input filters are designed using differential amplifiers, and a feedback. An interesting solution is presented in [14], where the authors propose a high precision four-input rank order filter based on gain-boosting amplifiers and voltage followers. A complete comparison of the filters is difficult, because in most of the published works, the authors do not specify a full set of filters parameters.…”

Section: Comparisonmentioning

confidence: 99%

“…For this reason, the median filtering greatly facilitates further image processing such as the edge detection or the segmentation. In integrated circuits, the median filters are implemented using both analog [2][3][4][5][6][7][8][9][10][11][12][13][14][15][16] and digital [17][18][19][20] techniques, depending on the design requirements. Typically, the greatest reduction of consumed power and required chip area are achievable using analog median filters, because they do not require analog to digital converters (ADC) for conversion of video signals generated by photo sensors.…”

Section: Introductionmentioning

confidence: 99%

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A nine-input 1.25 mW, 34 ns CMOS analog median filter for image processing in real time

Jendernalik

Blakiewicz

Jakusz

et al. 2013

Analog Integr Circ Sig Process

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In this paper an analog voltage-mode median filter, which operates on a 3 9 3 kernel is presented. The filter is implemented in a 0.35 lm CMOS technology. The proposed solution is based on voltage comparators and a bubble sort configuration. As a result, a fast (34 ns) time response with low power consumption (1.25 mW for 3.3 V) is achieved. The key advantage of the configuration is relatively high accuracy of signal processing, which allows the calculation of the median of signals with the difference in amplitude as small as 10 mV. This feature allows the application of the filter to vision systems with up to 7 bit equivalent resolution. The analytical and statistical analysis of the filter resolution, and analysis of its speed limitations are presented and compared to measurement results. Based on the achieved results, a set of guidelines for the filter design and optimisation is presented.

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Section: Comparisonmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

A nine-input 1.25 mW, 34 ns CMOS analog median filter for image processing in real time

Jendernalik

Blakiewicz

Jakusz

et al. 2013

Analog Integr Circ Sig Process

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“…Several negative feedback approaches analog circuits that perform ROF functions have been reported in the past [1]- [3]. Different kinds of transconductance comparators with (1) charging current for output voltage will change during operation time, this will limit the operation speed.…”

Section: Introductionmentioning

confidence: 99%

A new constant time analog rank order filter with O(n) complexity

Kuo

Chiu

Jan

et al. 2010

2010 3rd International Conference on Advanced Computer Theory and Engineering(ICACTE)

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ROF extracts the voltage magnitude by specitying the rank kth from a given set of inputs. A New and simple voltage-mode analog rank order filter architecture is presented. This paper we proposed a ROF which only needs a unit voltage as an input and selects the smallest value. Meanwhile, for multiple unit voltage by k, the proposed ROF easily selects their respective kth value. The overall hardware exhibits linear increase of complexity with the number of inputs O(n). Rank is easily programmable with voltage for all rank order values from Max. to Min. Moreover, bias current for charging output capacitor is fixed, unlike the previously reported circuits, this makes the proposed structure be constant with time. It can be observed in the simulation result that the slope of voltage rising is constant. In other words, the delay of reaching kth voltage value remains the same regardless of the number of input.

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“…Hardware complexity is also reduced since we can select the data to pass to the later processing stages. Several authors have developed analog rank order filters [3][4][5][6][7]. Previous approaches include using transconductance amplifiers and artificial neural networks.…”

Section: Introductionmentioning

confidence: 99%

“…As signal processing circuits grow larger, it is desirable to reduce the transistor count in the modules. A high-speed ROF with O(n)transistor count has been reported [4]. However, if we wished to simultaneously determine signals of multiple ranks for a given set of inputs, we would have to replicate the whole circuit.…”

Section: Introductionmentioning

confidence: 99%

Fast and Modular Analog Rank Order Filter Using CMOS Technology

Mukund¹,

Mishra²

2009

IETE J Res

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In this paper, we apply the sorting network theory to construct an analog rank order filter. We present a voltage mode CMOS two-input sorting element and arrange these to form a rank order filter. The resulting circuit is simple and is a high-speed, high-precision design. Although the transistor count is moderately higher than other designs, the proposed circuit simultaneously outputs signals of all ranks rather than of just one specified rank. We also develop a slightly modified design which calculates the rank of a given signal. We present reports of simulations to verify the performance of the device.

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High-speed high-precision CMOS analog rank order filter with O(n) complexity

Cited by 8 publications

References 22 publications

A nine-input 1.25 mW, 34 ns CMOS analog median filter for image processing in real time

A nine-input 1.25 mW, 34 ns CMOS analog median filter for image processing in real time

A new constant time analog rank order filter with O(n) complexity

Fast and Modular Analog Rank Order Filter Using CMOS Technology

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