Quantisation error reduction for reducing Q-factor JPEG recompression

C. M. Ng, Vincent To Yee Ng, P. L. Poon

Research output: Chapter in book / Conference proceedingConference article published in proceeding or bookAcademic researchpeer-review

1 Citation (Scopus)


This paper studies the mechanism of recompression using the reduced Q-factor JPEG compression and highlights the areas which contribute to image distortion during recompression. A quantisation error reduction algorithm with the aim to preserve the originality of the image against recompression was presented. Statistical information from a typical image was collected which was then used as the threshold in the run time criteria of the algorithm. The algorithm works with the approach of adjusting the DCT coefficients to correct the quantisation errors. The algorithm was found work well for both images consisting of low frequency and high frequency components.
Original languageEnglish
Title of host publicationAnnual Conference of the North American Fuzzy Information Processing Society - NAFIPS
Number of pages6
Publication statusPublished - 1 Dec 2001
EventJoint 9th IFSA World Congress and 20th NAFIPS International Conference - Vancouver, BC, Canada
Duration: 25 Jul 200128 Jul 2001


ConferenceJoint 9th IFSA World Congress and 20th NAFIPS International Conference
CityVancouver, BC

ASJC Scopus subject areas

  • Computer Science(all)
  • Media Technology


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