Real-time multimedia transport over MANET has stringent bandwidth, delay, and loss requirements. It is
a great challenge to support such applications in wireless ad hoc networks, which are characterized by
frequent link failures, congestion, and lack of central administration.
Most image and video coding techniques are based on the method of
Discrete Cosine Transform (DCT) after partitioning the image into square
blocks. This method is called block DCT (BDCT). It is considered as one of
the best methods of image and vid
eo compression. However, in cases of high
compression ratios, the BDCT method results in the block boundaries being
visible in the reconstructed image (after decoding). This distortion is called
the blocking effect or blocking artifacts.
In this research we illustrate the blocking effect and its causes. Then, we
propose two methods for reducing the blocking effect using a 3-mode
adaptive filtering and a 3-mode adaptive interpolation. We realize the two
proposed methods by two suitable algorithms, seeking to effectively and
relatively simply reduce the blocking artifacts without causing degradation
of the other characteristics of the image quality (taking into account some
specific requirements of video coding). We present the results of applying
both the algorithms. The results show the effectiveness of the two proposed
methods.
