By adopting texture statistics for ray - space slice, initial search direction was established, and then.
在片间预测中,通过对光线空间片的纹理统计, 确立初始的搜索方向, 实现分层的直线方向搜索方法.
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Since conjugate - gradient method chose proper search direction, it improves the convergence very much.
共轭梯度法选取了适当的搜索方向, 使收敛性有了明显的改善.
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