Apparatus and method of motion detection for temporal mosquito noise reduction in video sequences
AssigneeSTMicroelectronics Asia Pacific Pte Ltd
InventorsXiaoyun Deng, Patricia Chiang
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Abstract
Apparatus and methods of motion detection for mosquito noise reduction in video sequences are provided. In one aspect, a method of motion detection in a sequence of digital images classifies a pixel of a plurality of pixels of a current image frame represented by a digital video input signal as a motion or non-motion pixel. A motion value for the pixel is calculated based on the classification of the pixel. The motion value is mapped to a coefficient of a temporal filter based on a control curve. A digital video output signal is generated based on the coefficient.
Claims23
A method of motion detection in a sequence of digital images, the method comprising:
- classifying a pixel of a plurality of pixels of a current image frame represented by a digital video input signal as a motion or non-motion pixel;
- calculating a motion value for the pixel based on the classification of the pixel;
- mapping the motion value to a coefficient of a temporal filter based on a control curve;
- and
- generating a digital video output signal based on the coefficient.
An apparatus for temporal mosquito noise reduction in digital imaging, comprising:
- a motion detector coupled to receive a first video input signal and a second video input signal, the motion detector configured to classify a pixel of a plurality of pixels of a current frame of an image as a motion or non-motion pixel based on the received first and second video input signals, calculate a motion value for the pixel based on the classification of the pixel, and generate a coefficient;
- a temporal filter coupled to receive the coefficient from the motion detector to generate a video output signal;
- and
- a frame delay unit coupled to receive the video output signal from the temporal filter to delay the video output signal and generate the second video input signal.
A digital image noise reduction device, comprising:
- a filter unit coupled to receive a video input signal and a delayed video signal to output a filtered video output signal, the filter unit including:
- a motion detector and temporal filter unit;
- and
- a spatial filter unit coupled to the motion detector and temporal filter unit;
- and
- a frame delay unit coupled to receive the filtered video output signal to output the delayed video signal.
A digital image noise reduction device, comprising:
- a first temporal filter unit coupled to receive a signal related to a video input signal to output a first temporally filtered signal, the first temporal filter unit including:
- a first frame delay unit coupled to receive the signal related to the video input signal to output a delayed video input signal;
- and
- a first motion detector and temporal filter unit coupled to receive the video input signal and the delayed video input signal to output the first temporally filtered signal;
- a second temporal filter unit coupled to receive a signal related to the first temporally filtered signal to output a second temporally filtered signal, the second temporal filter unit including:
- a second frame delay unit coupled to receive a video output signal to output a delayed video output signal;
- and
- a second motion detector and temporal filter unit coupled to receive the delayed video output signal and the signal related to the first temporally filtered signal to output the second temporally filtered signal;
- and
- a spatial filter coupled to receive a signal to output a spatially filtered signal, the spatial filter being coupled between the video input signal and first temporal filter unit, between the first temporal filter unit and the second temporal filter unit, or between an output of the second motion detector and temporal filter unit and an input of the second frame delay unit.
Dependencies are inferred from the claim text.