Tero Koivunen

Motion detection of an interlaced video signal

This paper describes an advanced algorithm for motion detection from an interlaced video signal, such as PAL or NTSC. A general comparative analysis of motion detectors utilizing one, two, and three field memories is presented. As a potential application, television scan rate conversion, e.g. deinterlacing, is considered. >

Motion field restoration using vector median filtering on high-definition television sequences

A nonlinear algorithm called vector median is introduced for motion-compensated upconversion of high-definition television (HDTV) images. The postprocessing technique of vector-median filtering is defined theoretically and applied to the HD-MAC HDTV coding system to compare sample motion-vector fields before and after the process. The quantitative effect of the vector-median operation with different test sequences is given as the rate of motion vectors changed by postprocessing, and upconverted images are shown to improve significantly with postprocessing

A noise-insensitive motion detector

The author describes a new algorithm for motion detection of a television signal. As possible applications, television scan rate conversions and noise reduction are considered. The proposed algorithm was not sensitive to channel noise. A memory efficient implementation is presented. >

Motion estimation using combined shape and edge matching

Abstract This paper describes a new motion estimation algorithm that can be used in motion compensated standards conversions. As an example, we propose a scanning rate conversion method for motion compensated field rate upconversion (FRU) from an interlaced 50 Hz to progressive 100 Hz format. Motion estimation is done on the block matching basis using a bit level classification approach (BLC). Motion vector selection is controlled by both the quantized rough shape and the edge information of the image. Non-linear vector postprocessing is used to obtain a consistent and uniform vector field. Block segmentation is used to improve the accuracy of the vector field.