Spatial filter useful for removing noise from video images and for preserving detail therein
Noise eliminating apparatus of a video signal utilizing a recursive filter having spatial low pass and high pass filters
TV picture motion vector measurement by correlation of pictures
Telemetry system with a sending station using recursive filter for bandwidth limiting
Temporal decorrelation of block artifacts
Motion signal processor
Video noise reducer with detection of both total and temporal picture changes
2-D real-time semi-systolic filter apparatus for HDTV
Method and circuit for adjusting the size of a video frame
High efficiency coder and method employing overlapped motion compensation and perfect reconstruction filter banks
ApplicationNo. 176794 filed on 01/03/1994
US Classes:348/607, Noise or undesired signal reduction348/606, Combined noise reduction and transition sharpening348/620Using frame or field delays (e.g., motion adaptive)
ExaminersPrimary: Chin, Tommy P.
Assistant: Le, Vu A.
Attorney, Agent or Firm
International ClassesH04N 007/18
AbstractThe present invention is a motion adaptive spatial filtering(MASF) method for use with a image coding apparatus, which proceeds the temporal band-limitation of the video frame signals on spatial domain along the trajectory of a moving component without temporal aliasing by using a filter having a band-limitation characteristic according to a cutoff frequency. It is well known that video signal may contain a lot of temporal aliasing components because of insufficient frame sampling rate. And it is impossible to design band-limiting temporal filter simply by convolving a sequence of frames along the temporal direction. From a signal processing point of view, the aliasing degrades filter characteristics. This filtering method takes advantage of the fact that, if motion of each pixel is known, the temporal filtering can be performed in the spatial domain filtering along its trajectory. That results in de-aliasing characteristic.
Field of SearchSpecified processing of frame or field difference signal (e.g., noise reduction, key signal spreading)
Including adaptive artifacts removal (e.g., switchable trap or LPF in luma channel)
Combined noise reduction and transition sharpening
Noise or undesired signal reduction
For removal of low amplitude random noise (e.g., variable bandwidth)
Using frame or field delays (e.g., motion adaptive)
Modification of signal bandwidth, frequency, or circuit impedance at subsurface location