例句與造句

1. Secondly , in the feature extraction stage , haar 2 - d wavelet transform is used in each band of the normalized image . the mean values and variances of the coefficients of 7 main wavelet channels are extracted as features
   該算法通過對(duì)歸一化處理后虹膜圖像的各個(gè)小分割區(qū)域進(jìn)行二維小波變換,提取出主要小波通道的小波系數(shù)均值和方差作為特征值。
2. It's difficult to find extraction stage in a sentence. 用extraction stage造句挺難的