System and methods for smoothing an input signal
DCFirst Claim
1. A process of smoothing an input signal, the input signal comprising a succession of frames, each frame comprising a succession of pixels, the process comprising:
- for each pixel of the input signal;
smoothing the pixel using a time constant (CO) for such pixel, thereby generating a smoothed pixel value (LO); and
determining whether there exists a significant variation between the value of the pixel and the value of the same pixel in a smoothed prior frame.
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Abstract
A process and a device operating in real time for identifying and localizing an area in relative movement in a scene and determining the speed and oriented direction of the relative movement in real time. The process carries out temporal processing of a digital video input signal S(PI) that includes deducing, from the variations between the value of each pixel in a frame and in the immediately preceding frame, a binary signal DP identifying whether or not there was a significant variation and a digital signal CO representing the magnitude of this variation, and a spatial processing including distributing in a matrix these two signals successively for a single frame that is scanned through the matrix, and deducing the required relative movement and its parameters from this matrix distribution. The device includes a temporal processing unit associated with a memory and a spatial processing unit associated with a delay unit, a clock unit and control unit to control the rate of operation of the temporal and spatial processing units.
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Citations
17 Claims
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1. A process of smoothing an input signal, the input signal comprising a succession of frames, each frame comprising a succession of pixels, the process comprising:
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for each pixel of the input signal; smoothing the pixel using a time constant (CO) for such pixel, thereby generating a smoothed pixel value (LO); and determining whether there exists a significant variation between the value of the pixel and the value of the same pixel in a smoothed prior frame. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. An apparatus for smoothing an input signal, the input signal comprising a succession of frames, each frame comprising a succession of pixels, the apparatus comprising:
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means for smoothing each pixel of the input signal using a time constant (CO) for the pixel, thereby generating a smoothed pixel value (LO); and means for detennining, for each pixel, the existence of a significant variation for between the value of the pixel and the value of the same pixel in a prior smoothed frame. - View Dependent Claims (11, 12, 13, 14, 15, 16, 17)
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Specification