In this paper

An image retrieval method is proposed based on DCT compressed-domain.With the partial decoding of DCT-encoded image data

the image features are extracted directly from the compressed domain.At first

reorder the DCT parameters in compressed-domain to get the directionality and multi-resolution for extracting the sketch of image.And then retrieved images by the CRH (Connected-Region Histogram) of image sketch.At last

we can sort the retrieved result by the gray histogram of DC map.The method is robust to gray

rotation

translation

and so on.The experimental results show that the proposed method is effective in image retrieval.