Toward better chroma subsampling

SMPTE Motion Imaging Journal

Volumn 117, Issue 4, 2008, Pages 39-45

  Chan, Glenn ^a  

^a NONE

Author keywords

[No Author keywords available]

Indexed keywords

BANDWIDTH; LIGHT;

COLOR RESOLUTION; HUMAN VISUAL SYSTEM; LIGHT PROCESSING; LOSSLESS; SHORTCUT METHOD; SUBSAMPLING TECHNIQUES; VIDEO SYSTEMS;

LUMINANCE;

EID: 52449107041     PISSN: 15450279     EISSN: None     Source Type: Journal    
DOI: 10.5594/J15100     Document Type: Article

References (9)

1. Rec. ITU-R BT. 601, "Studio encoding parameters of digital television for standard 4:3 and widescreen aspect ratios;" Rec. ITU-R BT.709-5, "Parameter values for the HDTV standards for productions and international programme exchange.
2. SMPTE 240M-1999 (Archived 2004) Television-"1125-Line High-Definition Production Systems-Signal Parameters," www.smpte.org.
3. Per SMPTE EG 28, luma and luminance have different meanings. See Poynton, Charles. "YUV and luminance considered harmful: A plea for precise terminology in video," http://poynton.com/PDFs/YUV_and_luminance_harmful. pdf.
4. For a more complete description of the algorithms and source code, please contact the author at glennchan@gmail.com.
5. Multitap FIR chroma filtering can also cause out of gamut colors. Although this behavior has been extensively tested, it does not seem overly problematic.
6. For the multitap FIR filter, the author tried to keep the filter characteristics in the spirit of ITU-R Rec. 601. The template guidelines with the passband frequency divided by 2 (because Rec. 601 defines filter performance for 2X subsampling and not 4X) were used.
7. For an overview of various standards in regards to chroma siting, see Poynton, Charles. "Merging computing with studio video: Converting between R'G'B' and 4:2:2." www.poynton.com/PDFs/Merging_RGB_ and_422.pdf. Please note that the resampling schemes presented in this article represent what many NLE codecs do (for NTSC DV) and does not reflect the actual NTSC DV standard. Those implementing NTSC DV systems should refer to original standards documents.
8. A good website with comparisons of different production codecs (especially 4:2:2 codecs) can be found at www.codecs.onerivermedia.com.
9. See the discussion of the "interlaced chroma problem" In Don Munsil and Stacey Spears' article "The Chroma Upsampling Error and The 4:2:0 Interlaced Chroma Problem," http://www.hometheaterhifi.com/ volume_8_2/dvd-benchmark-special-report-chroma-bug-4-2001.html.