Method to up-sample frequency rich images without significant loss of image sharpness

摘要

A bi-cosine filter having a scaling technique to process images for up-scaling that does not lead to loss of the high frequency content of the generated image nor leads to image artifact known as waxing and waning is disclosed. The two tap filter (100) includes an input node (102) coupled to receive the image data. A first multiplier (104) couples to receive a first coefficient (C0) and the image data input. The first multiplier (104) multiplies the image data input by the first coefficient (C0) to provide a first product. The image data input is feed through a delay element (106) to delay the image data by a predetermined time period. Delay element (106) connects to a second multiplier (108) that couples to receive a second coefficient (C1). The second multiplier (108) multiplies the time-delayed image data by the second coefficient (C1) to provide a second product. A summer (110) sums the first and second products of the first and second multiplier (104, 108) to provide this sum as a pixel data output at output node (112).