To search along the orientation of texture /color distribution or the constrained orientation, we select a source block BTN near a missing block BT firstly, and find the most similar block BSN to BTN, then update BT by the block BS near BSN.

• 若缺失信息的图像块B_T附近有一个已知图像块B_(TN),沿着纹理/颜色分布的方向或者约束的方向搜索,可以找到与B_(TN)最相似的块B_(SN),并用B_(SN)附近的图像块B_S去更新B_T。