In recent years, recording of color still images into magneto–optical video disks has beenincreasingly used as a method for recording electronic endoscopic images. In this case,image compression is often used to reduce the volume and cost of recording media andalso to minimize the time required for image recording and playback. With this in mind,we recorded 8 images into a magneto-optical video disk in 4 image compression modes(no compression, weak compression, moderate compression, and strong compression)using the Joint Photographic Image Coding Experts Group (JPEG) system, which is awidely used and representative method for compressing color still images, in order todetermine the relationship between the degree of image compression and the colorinformation in electronic endoscopic images. The acquired images were transferred to animage processor using an offline system. A total of 10 regions of interest (ROls) wereselected, and red (R), green (G), and blue (B) images were obtained using differentcompression modes. From histograms generated for these images, mean densities of R,G, and B in each ROI were measured and analyzed. The results revealed that colorchanges were greater for B, which had the lowest density, than for R or G as the degreeof compression was increased.
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