CAJ | 학술논문

经典NEDI（ New Edge-directed Interpolation ）算法计算插值系数时使用矩形模板，存在不能兼顾模板内像素方向性的缺陷，而且在插值时仅使用单一窗口，可能导致高低分辨率上协方差不满足几何对偶性，造成插值后图像边缘存在比较明显的振铃现象，影响视觉质量。针对该问题，采用中心位于待插值点的圆形模板计算插值系数，并进一步依据最小均方差判决准则提出一种自适应多窗口选择方法来确定最佳的插值窗口。实验结果表明，相对于传统的插值方法，该算法能够更好地保持边缘信息，插值结果具有良好的视觉效果，峰值信噪比也得到了明显提高。
경전NEDI（ New Edge-directed Interpolation ）산법계산삽치계수시사용구형모판，존재불능겸고모판내상소방향성적결함，이차재삽치시부사용단일창구，가능도치고저분변솔상협방차불만족궤하대우성，조성삽치후도상변연존재비교명현적진령현상，영향시각질량。침대해문제，채용중심위우대삽치점적원형모판계산삽치계수，병진일보의거최소균방차판결준칙제출일충자괄응다창구선택방법래학정최가적삽치창구。실험결과표명，상대우전통적삽치방법，해산법능구경호지보지변연신식，삽치결과구유량호적시각효과，봉치신조비야득도료명현제고。
Classic NEDI ( new edge-directed interpolation ) algorithm uses rectangular template to calculate the interpolation coefficients , this has the limitation of not taking into account the directivity of the pixels within template , besides, it just uses a single window while interpolating , which may lead to the mismatch of covariance in high-resolution and low-resolution , and cause obvious ringing effect in image edges after interpolating and impact the visual quality .In light of these problems , in this paper , we adopt a circular template with the centre in the interpolating point to calculate the interpolation coefficients , and further present an adaptive multiple windows selection approach according to the judging criterion of minimum means square error to chose the most matchable interpolation window .Experimental result indicates that relative to traditional interpolation methods , the proposed algorithm can better preserve the edges information , the interpolation results have better visual effect , and the peak signal noise ratio ( PSNR) is noticeably improved as well .