一种通过曲线拟合去除图像块效应的算法

Improved method to alleviate blocking artifacts via curve-fitting

基于DCT域的图像处理方法具有广泛的应用,但是由于需要对图像的DCT块单独进行处理,导致块效应的产生。本文提出了一种通过曲线拟合去除彩色图像中块效应的算法。首先获得原始图像与块效应图像的对应亮度点云映射关系,进而用曲线拟合的方法计算出最佳拟合曲线,最后使用拟合曲线对原始图像的亮度进行非线性处理,将处理后的亮度与块效应图像的色度分量进行组合。实验表明本文算法不仅能够能够有效地去除块效应、降低了计算量,而且还能够较好保持原块效应图像的色彩。

Image processing in discrete cosine transform （DCT） domain has been widely utilized. However, it is affected by blocking artifacts seriously because of the independent processing of the blocks. An improved method to alleviate blocking artifacts via curve-fitting is proposed in this paper. The steps of this algorithm are obtaining dot-to-dot mapping relationship of brightness, acquiring fitting curve, processing the brightness of the original image by the fitting curve and combining the processed brightness with the other components in the adjusted image （with blocking artifacts）, resulted image is acquired, which can keep the color of the adjusted image, has little blocking artifacts and low computational complexity.