Analog median filter circuit for image processing

Details Analog median filter circuit for image processing Analog median filter circuit for image processing

1999-01-11

2000-09-19

Tran, Toan

Miscellaneous active electrical nonlinear devices, circuits, and

Specific input to output function

Combining of plural signals

327407, 327361, G06G 712

Patent

active

061218170

ABSTRACT:
An analog median filter for rejecting isolated impulse noise while preserving signal step changes in image processing. The analog median filter includes a number of transconductance amplifiers with additional CMOS inverters coupled to the outputs of the amplifiers. The outputs of the inverters are coupled together in a feedback loop configuration with the amplifiers. The CMOS inverters act as a type of additional current source for the amplifiers, so as to sharpen the corners of the transfer curve at various current levels. The low gain of the inverters improve the stability of the output range. Because inverters are used, the feedback loop is coupled to the noninverting inputs of the amplifiers, while the input signals are coupled to the inverting inputs of the amplifiers.

REFERENCES:
patent: 4460837 (1984-07-01), Anderson, Jr.
patent: 5521543 (1996-05-01), Shou et al.
Dietz, Paul H., and L. Richard Carley, "An Analog Circuit Technique for Finding the Median," in IEEE 1993 Custom Integrated Circuits Conference, 1993, pp. 6.1.1-6.1.4.
Lin, Shang-Yi, and Tzi-Dar Chiueh, "A New Analog Median Filter," Dept. of Electrical Engineering, National Taiwan University, Taipei, Taiwan, pp. 1-10.
Oflazer, Kemal, "Design and Implementation of a Single-Chip 1-D Median Filter," IEEE Transactions on Acoustics, Speech, and Signal Processing, ASSP-31(5) :1164-1168, 1983.

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