Fractional scaling of image and video in DCT domain

We present an algorithm for scaling image and video with fractional factors of 1.25 and 1.50 directly in compressed (DCT) domain without explicit decoinprcssioii and recompression. lt dil'fers from those compressed-domain sampling methods that work only with integer factors, and provides more flexibility i n changing image sizes. We eniploy a simple. consistent and extensible way to unplenient the algorithm. The resulting scheme ensures that the compressed domain algoritluns always use fewer aritllnietic operations than their conventional spatial domain counterparts. Exprrimental results in terms af\,isual quality and objective evaluation are provided.