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In this paper, an improved method of image concentration for image coding with concentration and dilution is presented. Image concentration is an image resizing technique which shrinks an image size but does not change important region(s) in the original image, whereas image dilution is the reverse process to image concentration. The authors have proposed an image coding approach based on the image concentration and dilution. This paper focuses on an improvement of image concentration to enhance quality of the reconstructed (diluted) image. In the experimental results, the improved method obtains bitrate savings compared with image encoders alone, and the reconstructed images do not have perceptually noticeable artifacts.