Patent Issued for Adaptive Filter for Video Signal Processing for Decoder That Selects Rate of Switching between 2D and 3D Filters for Separation of Chroma and Luma Signals
The patent's assignee for patent number 8731072 is
News editors obtained the following quote from the background information supplied by the inventors: "Video images are a more effective means of communication when compared to still images. Various electronic devices such as televisions and video record players that display video images have become very common household devices.
"A television (TV), for example, operates by displaying video images in response to composite video signals received from a TV station or a video recorder attached to the television. A composite video signal comprises a luma signal and a chroma signal. The luma signal contains the luminance information, i.e., the grayscale or brightness details, pertaining to the video images. The chroma signal, on the other hand, contains chrominance information pertaining to the color details of the video images.
"During encoding of the composite video signals for transmission purposes, the chroma signal is modulated into a subcarrier signal and is mixed with the luma signal to limit the transmission bandwidth of the composite video signals. Thus, the chroma and the luma signals may partially share the same range of frequencies. When received by the TV, the composite video signal is input to a video decoder, which separates the chroma and the luma signals and performs a series of signal processing operations to display the video images.
"In general, the quality of separation of the chroma and luma signal of the composite video signals determines the quality of the video images displayed. In other words, to display high-quality video images, absolute separation of the chroma and the luma signals is required. However, this requirement is difficult to be fulfilled since some luma signals have frequencies that fall near the chroma subcarrier frequency and thus may not be separated by the video decoder.
"Incomplete separation of the chroma and luma signals results in cross-luminance or cross-chrominance effects.
"To prevent cross-luminance or cross-chrominance effects, video decoders employ sophisticated filters to enhance the separation of the chroma and the luma signals. Different types of filters, such as notch filters and comb filter, are used for that purpose. Comb filters are known to display a superior performance amongst the various other available filters.
"Comb filters basically utilize two techniques for separation of the chroma and the luma signals: line combing and frame combing. Line combing is generally utilized to display those portions of the video images that undergo motion while frame combing is applied to the portions that are still. Depending on the detection of motion in a video image to be displayed, a switching operation, i.e., dynamic switching between a line filter and a frame filter of the video decoder, may be performed for every pixel of the image."
As a supplement to the background information on this patent, VerticalNews correspondents also obtained the inventor's summary information for this patent: "The subject matter described herein is directed towards an adaptive filter for video signal processing for use in a video decoder system. This summary is not intended to identify essential features of the claimed subject matter, nor is it intended for use in determining the scope of the claimed subject matter.
"The adaptive filter, interchangeably referred to as the temporal adaptive motion filter, includes an adaptive time constant control module. In one implementation, the adaptive time constant control module receives details relating to a motion magnitude, a motion polarity, and a chroma-luma status of pixels in of a current composite video signal. A pixel may be decoded using a 2D filtering method and or a 3D filtering method. Based on the motion magnitude, the motion polarity, and the chroma-luma status of a pixel, the adaptive time constant control module selects a time constant to vary a rate of transition between the 2D filtering method and the 3D filtering method."
For additional information on this patent, see: Bacche, Ravi Ananthapur. Adaptive Filter for Video Signal Processing for Decoder That Selects Rate of Switching between 2D and 3D Filters for Separation of Chroma and Luma Signals. U.S. Patent Number 8731072, filed
Keywords for this news article include: Signal Processing,
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