●●● 1图像获取 ●●●● ●●●●● ●●●● ●●●0● ●●●0 2=∑p(z)"(z-9)nz k=1 Z4-2Zqk+qk lz 对q求导 0=p22+2q Zp(z)dz k+1 (2 dz Zk 若P(Z)为常数,则 +Z1 此时量化误差为 12K21 图像获取 ( ) ( ) ( ) ( ) ( )( ) ( ) ( ) ( ) ( ) ( ) 2 2 2 1 k 1 Z Z k 1 2 2 1 2 2 12 H 2 1 q 0 p Z 2 2 q 2 1 1 k 1 k 1 1 K H Z Z P Z p Z dZ Zp Z dZ q Z q dZ p Z Z Zq q dZ p Z Z q dZ k k Z Z Z Z k k K k Z Z k k K k Z Z k k k k k k k k k − = +  = = − + = − + = − + = =        + + + + + 此时量化误差为 若 为常数，则 对 求导 