A Spatio-Temporal Filter for Region-of-Interest Video Coding

• Region of interest (ROI) video coding increases the quality in regions interesting to the viewer at the expense of quality in the background. This enables a high perceived quality at low bit rates. A successfully detected ROI can be used to control the bit-allocation in the encoding. In this paper we present a filter that is independent of codec and standard. It is applied in both the spatial and the temporal domains. The filter’s ability to reduce the number of bits necessary to encode the background is analyzed theoretically and where these bits are re-allocated. The computational complexity of the algorithms is also determined. The quality is evaluated using PSNR of the ROI and subjective tests. Test showed that the spatio-temporal filter has a better coding efficiency than using only spatial or only temporal filtering. The filter successfully re-allocates the bits from the background to the foreground.

Ämnesord

NATURVETENSKAP  -- Data- och informationsvetenskap -- Datorteknik (hsv//swe)

NATURAL SCIENCES  -- Computer and Information Sciences -- Computer Engineering (hsv//eng)

TEKNIK OCH TEKNOLOGIER  -- Elektroteknik och elektronik -- Signalbehandling (hsv//swe)

ENGINEERING AND TECHNOLOGY  -- Electrical Engineering, Electronic Engineering, Information Engineering -- Signal Processing (hsv//eng)

Nyckelord

Computer engineering

Datorteknik

Signal processing

Signalbehandling

Publikations- och innehållstyp

vet (ämneskategori)

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