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Occurrence Condition of False Contour in JPEG and Its Improvement

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The performance of recent digital cameras, printers, scanners and other input-output devices are wonderful. Therefore, the quality of a digital image is improved remarkably. As a result, the quality of the compressed image has come to be focused on. False contours may appear in the decoded image when a digital image is compressed with JPEG (Joint Photographic Expert Group) compression algorithm. There were many cases we are not able to perceive false contours when we used the input-output devices with certain noise level. We reported that false contours appear by the accuracy improvement of the output devices with the research in the IS&T's NIP158.

In this research, we studied the condition that false contours are seemed to the eyesore from both side of compressibility and the noise level of printer. We tried some experiments with various kinds of printer.

Document Type: Research Article

Publication date: January 1, 2000

More about this publication?
  • For more than 25 years, NIP has been the leading forum for discussion of advances and new directions in non-impact and digital printing technologies. A comprehensive, industry-wide conference, this meeting includes all aspects of the hardware, materials, software, images, and applications associated with digital printing systems, including drop-on-demand ink jet, wide format ink jet, desktop and continuous ink jet, toner-based electrophotographic printers, production digital printing systems, and thermal printing systems, as well as the engineering capability, optimization, and science involved in these fields.

    Since 2005, NIP has been held in conjunction with the Digital Fabrication Conference.

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