Abstract
In re-size (scaling) of a picture, quality up processing which are called super resolution have been studied. We have discussed a method of directional adaptive processing to reduce jaggy and ringing. On the other hand, geometric image conversion such as affine transform is one of re-size processing which have different magnification scale in a pixel. However, some super resolution methods are not suitable to this processing. At first, we discuss a hybrid re-sampling which uses a high order filter and a linear interpolation to balance the spatial frequency and flexibility. Next, pre-filtering is discussed to reduce alias component in size deduction. Finally, we apply a directional adaptive processing for the geometric image conversion to reduce jaggy. As results of experiments, it was recognized that the proposed method gives better PSNR and subjective picture quality.
