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DxOMark

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DxOMark is a website providing image quality ratings for standalone cameras, lenses, and mobile devices that include cameras, particularly smartphones.[1] It is owned by DxOMark Image Labs, headquartered in Boulogne-Billancourt, France.[2][3] DxOMark Image Labs was spun off from DxO Labs in September, 2017.[4]

Camera sensor rating

The DxOMark Camera Sensor Score measures several important image quality metrics of the RAW image captured by a camera's sensor. The overall score is a confidential combination of three sub-scores:

  • Color Depth, measured in bits, called a Portrait score
  • Dynamic Range, measured in stops of dynamic range, called a Landscape score
  • Low-light performance, measured in an ISO equivalent, called a Sports score

Another metric, the Perceptual MegaPixel (P-MPix) is used to rate the resolution a camera produces when paired to a particular lens.[5] DxOMark claims that P-MPix is a more accurate and relevant value for photographers to consider than alternate measures of sharpness when evaluating camera and lens image quality.[6][7][8][9] As of December 2015, the Canon EF 300mm f/2.8L IS II USM lens mounted on a Canon EOS 5DS R have the highest measured P-MPix (45 P-Mpix) followed by the Carl Zeiss APO Sonnar T* 2/135 ZE (41 P-Mpix on Canon EOS 5DS R and 36 P-Mpix on Nikon D800E).[10]

DxOMark data has been used to plot the progress of sensor image quality and low-light sensitivity versus price over the years, as well as the impact of sensor size and resolution.[11] More recently, DxOMark has also evaluated drone cameras for image quality.[12]

Lens rating

DxOMark also provides lens ratings, as tested using its proprietary toolset in combination with various camera models.[13][14][15]

Mobile rating

As smartphones began to overtake point-and-shoot cameras,[16] DxOMark began testing smartphones and other mobile devices in 2011 and introduced DxOMark Mobile in 2012.[17] A major update was made in September 2017, adding tests designed to stress the capabilities of current-model smartphones such as lower-light shooting, telephoto zoom, depth effect, and bokeh.[18]

DxOMark Mobile Overall Score is the headline number reported for each tested device, and consists of a proprietary combination of DxOMark Mobile Photo and DxOMark Mobile Video category scores.

DxOMark's Mobile Photo score is a proprietary combination of nine category sub-scores:

  • Exposure and contrast
  • Color
  • Autofocus
  • Texture
  • Noise
  • Artifacts
  • Flash
  • Zoom
  • Bokeh[19]

DxOMark's Mobile Video score includes six of the same Sub-scores as DxOMark's Mobile Photo score (Exposure, Color, Autofocus, Texture, Noise, and Artifacts), along with Stabilization.

DxOMark's tests are conducted by the company's technical staff under a variety of lighting conditions, ranging from low-light 1 Lux to bright daylight outdoors.[20]

Sub-scores are combined using a proprietary and confidential mapping into an overall score. Tests are also confined to default modes, except for Zoom and Bokeh, which has caused reviewers to be cautious when using them.[21]

Selfie-camera rating

As of 22 January 2019, DXOMark has started testing the front-facing (selfie) cameras on smartphones.[22] Selfie tests are done for both Photo and Video. For Photo there are sub-scores for Exposure, Color, Focus, Texture, Noise, Artifacts, Flash, and Bokeh. For Video, sub-scores include Exposure, Color, Focus, Texture, Noise, Artifacts, and Stabilization.[23]

Comparison tool

Users can select several devices of the same class and have the site display a comparison of their test scores and graphical versions of the actual test data.[24][25]

Usage in industry

DxOMark ratings are often used by the press to describe the image quality characteristics of their cameras and mobile devices.[20][26][27][28] High DxOMark Mobile ratings have also been featured as hallmarks of quality in vendor announcements[29] and marketing materials[30], although reviewers are careful to note that the ratings only reflect image quality.[31][32][33] DxOMark also provides consulting services to hardware manufacturers, related to image quality.[34][35]

References

  1. ^ "What is DxOMark? | DxOMark". Retrieved 2016-08-23.
  2. ^ "DxOMark unveils expanded mobile benchmark suite". smartchimps.com. Retrieved 2017-10-10.
  3. ^ "DxOMark by DxOMark Image Labs | DxOMark". www.dxomark.com. Retrieved 2016-08-24.
  4. ^ "DxOMark splits from DxO Labs, is now an independent privately-owned company". DPReview. Retrieved 2019-03-22.
  5. ^ http://www.dxomark.com/index.php/Publications/DxOMark-Reviews/Looking-for-new-photo-gear-DxOMark-s-Perceptual-Megapixel-can-help-you
  6. ^ http://petapixel.com/2012/12/17/perceptual-megapixel-mtf-charts-boiled-down-to-a-single-number/
  7. ^ http://photo.net/photography-news-forum/00b9IO
  8. ^ http://timgrey.com/blog/2013/dxomark-introduces-the-perceptual-megapixel/
  9. ^ http://news.cnet.com/8301-17938_105-57559599-1/dxo-labs-tries-making-sense-of-camera-lens-sharpness/
  10. ^ http://www.dxomark.com/index.php/Lenses/Camera-Lens-Ratings/Optical-Metric-Scores
  11. ^ "DxOMark Sensor For Benchmarking Cameras - Luminous Landscape". Luminous Landscape. Retrieved 2015-11-14.
  12. ^ "DxOMark benchmarks for popular drone camera sensors | DxOMark". Retrieved 2017-06-15.
  13. ^ "Camera Lens Ratings by DxOMark | DxOMark". www.dxomark.com. Retrieved 2015-11-11.
  14. ^ "A Simple Guide to the DxOMark Numbers – Daystar". daystarvisions.com. Retrieved 2015-11-11.
  15. ^ "Skylock1". Friday, 4 January 2019
  16. ^ Daisuke Wakabayashi, "The Point-and-Shoot Camera Faces Its Existential Moment", Wall Street Journal July 30, 2013 [1]
  17. ^ Lexy Savvides. "Smartphones outperforming high-end compact cameras". Retrieved February 15, 2014.
  18. ^ "DxOMark revamps its mobile testing for the phone cameras of 2017". Android Central. 2017-09-12. Retrieved 2017-09-12.
  19. ^ "DxOMark's testing protocol for scoring smartphone cameras adds zoom, bokeh". Digital Trends. 2017-09-12. Retrieved 2017-09-12.
  20. ^ a b "iPhone 7 Has Third Best Smartphone Camera DxOMark Has Ever Tested". PetaPixel. 2016-09-28. Retrieved 2016-11-13.
  21. ^ "What is a DXOMark Score?". PC World. Retrieved 2019-03-27.
  22. ^ "Here are the best selfie cameras on the market, according to DxOMark". Digital Trends. 22 January 2019. Retrieved 22 January 2019.
  23. ^ Monckton, Paul. "How DxOMark's New Test Ranks Selfie Cameras". Forbes. Retrieved 2019-03-27.
  24. ^ "A Simple Guide to the DxOMark Numbers – Daystar". daystarvisions.com. Retrieved 2016-08-23.
  25. ^ "How do I Use DxOMark? | Northrup.Photo". northrup.photo. Retrieved 2016-08-23.
  26. ^ "HTC 10 gets the same DXOMark score as Galaxy S7". 2016-04-12. Retrieved 2016-08-23.
  27. ^ "Leading Camera Lab Report: Samsung Galaxy S7 Edge Named New Smartphone Camera Champion - Samsung Newsroom". 2016-03-18. Retrieved 2016-08-23.
  28. ^ "How Google hopes its Pixel camera will win over iPhone fans". CNET. Retrieved 2016-11-13.
  29. ^ "8 times Google savagely burned Apple during the Pixel announcement". Macworld. Retrieved 2016-11-13.
  30. ^ "Google Pixel 2 & Pixel 2 XL | Verizon Wireless". www.verizonwireless.com. Retrieved 2018-03-08.
  31. ^ Bagnell, Juan Carlos (2016-10-04). "Google Pixel: A great DXOMARK score doesn't mean "The best smartphone camera"". Pocketnow. Retrieved 2016-11-13.
  32. ^ "Who's hiding behind DxOMark scores? - AndroidPIT". AndroidPIT. Retrieved 2017-06-15.
  33. ^ "Google's New Pixel 2 Phone Cameras Are Highly Rated". Fortune. Retrieved 2017-10-05.
  34. ^ "DxOMark scores shouldn't be your definitive camera rating system". Android Authority. 2017-10-09. Retrieved 2017-10-10.
  35. ^ "A Summary of MKBHD's Explanation of DxOMark Ratings - Resource". Resource. Retrieved 2017-10-17.
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