Integer U transform and its application in image coding

Abstract

In the image compression field, novel transform coding approaches are always necessary to obtain lower computational complexity and better reconstruction. Therefore, integer U-orthogonal transform and image coding algorithm is constructed in this paper. First, an 8×8 integer U-orthogonal transform through the discrete orthogonal U-system is constructed, and its fast algorithm is derived according to its symmetric and recursive property. Then, a quantization table meeting sequency characteristics of U-transform matrix is provided. Finally, the integer U transform and the new quantization table are applied to image coding. The comparative experimental results show that the coding effect of U-transform method is better than JPEG encoding method. Therefore, the integer U-transform image coding method is an alternative scheme.