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Key Frame, Feature Extraction, Similarity Measures, Orthogonal Transforms.

With the development of multimedia and growing database there is huge demand of video retrieval systems. Due to this, there is a shift from text based retrieval systems to content based retrieval systems. Selection of extracted features play an important role in content based video retrieval. Good features selection also allows the time and space costs of the retrieval process to be reduced. Different methods[1,2,3] have been proposed to develop video retrievals systems to achieve better performance in terms of accuracy.
The proposed technique uses transforms to extract the features. The used transforms are Discrete Cosine, Walsh, Haar, Kekre, Discrete Sine, Slant and Discrete Hartley transforms. The benefit of energy compaction of transforms in higher coefficients is taken to reduce the feature vector size by taking fractional coefficients[5] of transformed frames of video. Smaller feature vector size results in less time for comparison of feature vectors resulting in faster retrieval of images. The feature vectors are extracted and coefficients sets are considered as feature vectors (100%, 6.25%, 3.125%, 1.5625%, 0.7813%, 0.39%, 0.195%, 0.097%, 0.048%, 0.024%, 0.012%, 0.006% and 0.003% of complete transformed coefficients). The database consists of 500 videos spread across 10 categories.