关键词: 图像检索, 位平面, 位平面直方图特征向量, 直方图特征, 灰度码

Abstract: Firstly，the image is divided into eight bit planes.The first four most significant bit planes of the image are considered and later each 4-bit vector is converted to its corresponding reflected gray code.Histogram features of each bit plane are computed：Mean，standard deviation，skew，energy and entropy.Then，a combined vector named bit-plane histogram features vector is constructed for image retrieval.Finally，Tonimoto measure is adopted to measure the similarity between images.The method is fast and has no improper retrieval caused by image color quantization technique.Experimental results demonstrate the performance of the method.

Key words: image retrieval, bit-plane, bit-plane histogram features vector, histogram features, gray code