82 research outputs found

    Image Quality Assessment Using Spatial Frequency Component

    Full text link
    Image quality assessment (IQA) is a crucial technique in perceptual image/video coding, because it is not only a ruler for performance evaluation of coding algorithms but also a metric for ratio-distortion optimization in coding. In this paper, inspired by the fact that distortions of both global and local information influence the perceptual image quality, we propose a novel IQA method that inspects these information in the spatial frequency components of the image. The distortion of the global information mostly existing in low spatial frequency is measured by a rectified mean absolute difference metric, and the distortion of the local information mostly existing in high spatial frequency is measured by SSIM. These two measurements are combined using a newly proposed abruptness weighting that describes the uniformity of the residual image. Experimental results on LIVE database show that the proposed metric outperforms the SSIM and achieves performance competitive with the state-of-the-art metrics. ? 2009 Springer-Verlag Berlin Heidelberg.EI

    The Physics of the B Factories

    Get PDF

    Why do academics work?

    No full text
    SIGLEAvailable from British Library Document Supply Centre-DSC:3597.9178(no 2000/9) / BLDSC - British Library Document Supply CentreGBUnited Kingdo

    Constraints and incentives in the UK university system

    No full text
    Revised ed.SIGLEAvailable from British Library Document Supply Centre-DSC:3597.9178(no 2000/3) / BLDSC - British Library Document Supply CentreGBUnited Kingdo
    • …
    corecore