structure conversion filter [2]. Format conversion filters can also be applied for multiresolution encoding of images This paper proposes new format conversion filters. The proposed filters have advantages in hardware complexity and opand for display processors which control the sizes and erating speed over the ones proposed in the MPEG-4 video frame rates of image sequences for output devices.
verification model (VM). Each coefficient of the proposed filters
In this paper, we concentrate on the design of format is constrained to have no more than two non-zero digits in conversion filters which can be used as part of preprocesminimal signed digit representation, leading to single adder sors for MPEG encoding. In a video test model for MPEGimplementation of each filter tap. As a result, the proposed 2 or a video verification model (VM) for MPEG-4, several filters have advantages in hardware complexity and speed, com-FIR filters are proposed for the format conversion of the pared to conventional filters which are usually implemented by input images [3-5]. In the case of the video VM for MPEGexpensive fast adders or multipliers. Several format conversion 4 [4, 5], format conversion algorithms are suggested for filters are designed for replacing the filters proposed in the the conversion of an ITU-R 601 image into CIF, SIF, and MPEG-4 video VM. Comparing the PSNRs of the images processed by the proposed filters and the ones in the MPEG-QCIF, respectively. These algorithms are based on the 4 video VM, it is shown that they provide almost the same filters proposed in [6, 7]. More specifically, in the MPEGperformance. In conclusion, the performance of the proposed 4 video VM, several filters shown in
Table 1 are proposed filters is comparable to that of those in the MPEG-4 video for format conversion of the input image. In Table 1, A, VM, while requiring lower hardware complexity and providing B, C, ΠΈ ΠΈ ΠΈ are filter names, and ''Factor'' describes the usage higher operating speed.