Method and device for processing pixels contained in a video sequence

摘要

Method and device for processing pixels contained in a video sequence including processing the pixel amplitude of at least one Image pixel contained in a current frame of a video sequence. The method includes the steps of constructing an individual motion trajectory including motion-shifted versions of the image pixel over a plurality of neighboring frames, and processing the pixel amplitude based on the individual motion trajectory. The step of the constructing the individual motion trajectory includes the steps of choosing at least one image pixel of the current frame as a start pixel of the individual motion trajectory, and adding motion-shifted versions of the image pixel of preceding find/or subsequent frames to the individual motion trajectory.

主权项

1. A method for processing the pixel amplitude of at least one image pixel contained in a current frame of a video sequence, said method comprising the steps of constructing an individual motion trajectory comprising motion-shifted versions of the at least one image pixel over a plurality of neighboring frames, and filtering the pixel amplitude with an individual filter length based on the individual motion trajectory that results from a pixel-wise decision concerning the filter length,
wherein said step of constructing said individual motion trajectory comprises the steps of:
choosing the at least one image pixel of the current frame as a start pixel of the individual motion trajectory, and adding motion-shifted versions of the at least one image pixel of preceding and/or subsequent frames to the individual motion trajectory;wherein for each motion-shifted version to be added, it is determined whether a difference value, which indicates the change of the pixel amplitude of the respective motion-shifted version between consecutive frames, is smaller than an amplitude threshold value, which is individually assigned to the current frame or a frame portion of the current frame comprising said at least one image pixel, and wherein said step of adding further motion-shifted versions is stopped if said difference value exceeds said amplitude threshold value, and wherein said amplitude threshold value is allocated to the current frame by carrying out the following steps:
a) defining an amplitude threshold value range comprising a plurality of amplitude threshold values;(b) processing the pixel amplitudes of a plurality of pixels contained in the current frame based on a given amplitude threshold value of said amplitude threshold value range, and generating a processed frame;(c) comparing the processed frame with a reference frame and determining an image difference value;d) repeating steps (b) and (c) for each amplitude threshold value of said amplitude threshold value range and determining the respective image difference value;(e) determining the amplitude threshold value providing the smallest image difference value; and(f) allocating the determined amplitude threshold value to the current frame.