Image Retrieval Algorithm Based on Quantized DCT Coefficients

In the image retrieval technology, the aim is to retrieve an image based on DCT color coefficients. There were many algorithms based on single feature, presented in past. Those algorithms have lack of speed and require more computational capability. In this algorithm by using DCT, most similar images are retrieved. The idea of DCT was to decouples the color component of image using YCbCr color model and transform these color components into DCT coefficients moreover reduce the number of bits simply dividing of each DCT coefficients with constant quantization matrix and round them into nearest number to calculate features of that image for performing similarity measure.