The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Sep. 19, 2000
Filed:
Jan. 11, 1999
Hongli Yang, Sunnyvale, CA (US);
Datong Chen, Fremont, CA (US);
OmniVision Technologies, Inc., Sunnyvale, CA (US);
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.