Improving image fidelity by luma-assisted chroma subsampling

Jari Korhonen

    Research output: Chapter in Book/Report/Conference proceedingArticle in proceedingsResearchpeer-review


    Chroma subsampling is commonly used for digital representations of images and video sequences. The basic rationale behind chroma subsampling is that the human visual system is less sensitive to color variations than luma variations. Therefore, chroma data can be coded in lower resolution than luma data, without noticeable loss in perceived image quality. In this paper, we compare different upsampling methods for chroma data and show that by using advanced upsampling schemes the fidelity of the reconstructed image can be significantly improved. We also present an adaptive upsampling method that uses full resolution luma information to assist chroma upsampling. Experimental results show that in the presence of compression noise, the proposed technique steadily outperforms advanced non-assisted upsampling.
    Original languageEnglish
    Title of host publicationProceedings of IEEE International Conference on Multimedia and Expo.
    Number of pages6
    Publication date2015
    ISBN (Print)9781479970827
    Publication statusPublished - 2015
    Event2015 IEEE International Conference on Multimedia and Expo - Turin, Italy
    Duration: 29 Jun 20153 Jul 2015
    Conference number: 16


    Conference2015 IEEE International Conference on Multimedia and Expo
    Internet address


    • Image coding
    • Chroma subsampling


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