Ati Technologies Ulc

Sergio Goma

Milivoje M Aleksic

Radu Gheorghe

Graham C H Greenland

Milivoje Aleksic

Graham CH Greenland

An image noise filter includes a wavelet transform module and an edge based adaptive filter module. The dual tree wavelet transform module provides low frequency wavelet information and high frequency wavelet information in response to image information. The edge based adaptive filter module provides filtered high frequency wavelet information in response to the high frequency wavelet information and edge information that is based on the low frequency wavelet information.

Image noise filter and method

Circuitry, apparatus and methods provide flicker detection and improved image generation for digital cameras that employ image sensors. In one example, circuitry and methods are operative to compare a first captured frame with a second captured frame that may be, for example, sequential and consecutive or non-consecutive if desired, to determine misalignment of scene content between the frames. A realigned second frame is produced by realigning the second frame with the first frame if the frames are determined to be misaligned. Luminance data from the realigned second frame and luminance data from the pixels of the first frame are used to determine if an undesired flicker condition exists. If an undesired flicker condition is detected, exposure time control information is generated for output to the imaging sensor that captured the frame, to reduce flicker. This operation may be done, for example, during a preview mode for a digital camera, or may be performed at any other suitable time.

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San Diego, CA, United States of America

Sergio Goma