Back to results
US 5,619,261 AGranted
Pixel artifact/blemish filter for use in CCD video camera
AssigneeOEC Medical Systems, Inc.
InventorR. Larry Anderton
Life of this patent
Estimating the term…
Loading patent…
Loading patent…
AssigneeOEC Medical Systems, Inc.
InventorR. Larry Anderton
Estimating the term…
A pixel artifact/blemish filter for use in a CCD video camera which produces a video signal composed of a series of pulses, each representing a pixel, for developing a video image. The filter includes a delay line for receiving the video signal produced by the camera, and for delaying the video signal pulses by a time of approximately one pulse width duration. The filter also includes first and second signal transfer elements for receiving respectively each video signal pulse directly from the camera and each most recently delayed video signal, and for passing either the directly received pulse or the delayed pulse, depending upon the relative magnitude of the two pulses. Since pixel artifact pulses are typically more positive than non-artifacts pulses, the signal transfer elements generally pass the more negative video signal pulses so that the pixel artifact pulses are suppressed when they arrive at the transfer elements.
In a charge-coupled device video camera for producing a video image signal composed of a series of pulses, each representing a pixel, from which a video image may be developed, a pixel artifact filter for filtering pixel artifact pulses which differ in magnitude from next adjacent non-artifact pulses, said filter comprising:
A blemish suppression circuit for suppressing pixel blemishes which may occur in video images represented in a video image signal composed of a series of electrical pulses, with each pulse representing a pixel in the image, each pixel blemish characterized by an increase in magnitude of the pulse representing said each pixel blemish, said suppression circuit comprising:
In a charge-coupled device video camera for producing a video image signal composed of a series of pulses, each representing a pixel, for developing a video image, a method of filtering pixel artifact pulses which differ in magnitude from adjacent non-artifact pulses, said method comprising:
Dependencies are inferred from the claim text.