School of Biological and Health Systems Engineering, Arizona State University, Tempe, AZ 85287, USA.
IEEE Trans Image Process. 2013 Aug;22(8):2960-9. doi: 10.1109/TIP.2012.2228493. Epub 2012 Nov 20.
We introduce a new edge-directed interpolator based on locally defined, straight line approximations of image isophotes. Spatial derivatives of image intensity are used to describe the principal behavior of pixel-intersecting isophotes in terms of their slopes. The slopes are determined by inverting a tridiagonal matrix and are forced to vary linearly from pixel-to-pixel within segments. Image resizing is performed by interpolating along the approximated isophotes. The proposed method can accommodate arbitrary scaling factors, provides state-of-the-art results in terms of PSNR as well as other quantitative visual quality metrics, and has the advantage of reduced computational complexity that is directly proportional to the number of pixels.
我们介绍了一种新的基于局部定义的直线逼近的边缘导向插值器，用于图像等照度线。图像强度的空间导数用于描述像素相交等照度线的主要行为，即它们的斜率。斜率通过求解三对角矩阵来确定，并在分段内强制从一个像素到另一个像素线性变化。图像调整大小是通过沿着近似等照度线进行插值来完成的。所提出的方法可以适应任意的缩放因子，在 PSNR 以及其他定量视觉质量指标方面提供了最先进的结果，并且具有计算复杂度降低的优点，该复杂度与像素数量成正比。
