基于Hermite插值的视频图像分辨率匹配电路设计

Design of image resolution matching circuit based on Hermite interpolation

目前常用的图像分辨率匹配算法,存在着缩放效果模糊或硬件消耗过大等问题。综合缩放效果和电路消耗考虑,提出了一种基于三次Hermite插值算法的图像分辨率匹配电路。以基于数字差分分析算法的模块控制插值源像素的选取,以Hermite算法为内核完成插值系数的计算,相对双三次插值算法,保证了较小的硬件消耗。通过均方差、峰值信噪比、灰度梯度模值和傅里叶频谱对Hermite插值算法缩放效果与其余算法缩放效果进行定量分析,表明三次Hermite插值算法比双线性插值算法具有更好的缩放效果。同时通过电路综合结果,表明该电路相对基于双三次插值的电路,硬件消耗更小。

The algorithm widely used in image resolution matching exits different problems, such as the blurry scaling effect and oversized hardware consumption. With the consideration of scaling effect and circuit consumption,this paper presents a resolution matching circuit based on Hermite interpolation algorithm, as well as a pixel selection controlling module using Digital Differential Analyzer algorithm, and interpolation factor calculating system based on Hermite interpolation algorithm. These settings ensure a less consumption, compared with the circuit based on bicubic interpolation algorithm. The scaling effect using Hermite interpolation is proved to be better than bilinear scaling effect, with measurable analyses using RMSE, PSNR, gray grads and Fourier frequency chart. And the hardware consumption is proved to be less than the circuit using bicubic interpolation method by analyzing synthesis report.