补全代码function loca = wm_type_0locawstepg此函数用于在HL子带嵌入水印输入：loca为要嵌入水印的子带输出：loca为嵌入水印后的子带m2n2 = sizeloca;index = 1;取出22的块for k = 12m2-1 for kk = 12n2-1 tem = locakk+1kkkk+1; a11 = tem11;

%-----如果a21和a22不满足条件，则也要调整------------ if a21-a22<=g a21 = a21 + s; a22 = a22 - s; else break; end tem(1,1) = a11; tem(1,2) = a12; tem(2,1) = a21; tem(2,2) = a22; loca(k:k+1,kk:kk+1) = tem;