Statistical Interpretation of ISO TC42 Dynamic Range: Risky Business
نویسندگان
چکیده
Recently, two ISO electronic imaging standards aimed at digital capture device dynamic range metrology have been issued. Both ISO 15739 (digital still camera noise) and ISO 21550 (film scanner dynamic range) adopt a signal-to-noise ratio (SNR) criterion for specifying dynamic range. To resiliently compare systems with differing mean-signal transfer, or Electro-Optical Conversion Functions (OECF), an incremental SNR (SNRi) is used. The exposure levels that correspond to threshold-SNR values are used as endpoints to determine measured dynamic range. While these thresholds were developed through committee consensus with generic device applications in mind, the methodology of these standards is flexible enough to accommodate different application requirements. This can be done by setting the SNR thresholds according to particular signal-detection requirements. We will show how dynamic range metrology, as defined in the above standards, can be interpreted in terms of statistical hypothesis testing and confidence interval methods for mean signal values. We provide an interpretation of dynamic range that can be related to particular applications based on contributing influences of variance, confidence intervals, and sample size variables. In particular, we introduce the role of the spatial-correlation statistics for both signal and noise sources, not covered in previous discussions of these ISO standards. This can be interpreted in terms of a signal’s spatial frequency spectrum and noise power spectrum (NPS) respectively. It is this frequency aspect to dynamic range evaluation that may well influence future standards. We maintain that this is important when comparing systems with different sampling settings, since the above noise statistics are currently computed on a per-pixel basis.
منابع مشابه
Debunking of Specsmanship: Progress on ISO/TC42 Standards for Digital Capture Imaging Performance
For serious imaging practitioners, the benefits of variety and economy in digital capture device selection come as a mixed blessing, among dizzying performance specification hype. This “specsmanship” has created a bazaar-like atmosphere where manufacturers’ claims of resolution, speed, and dynamic range resonate like those of so many market barkers. Through regulation, education, and enablement...
متن کاملDoes the Ability to Make a New Business Need More Risky Choices during Decisions? Evidences for the Neurocognitive Basis of Entrepreneurship
متن کامل
Applying and Extending ISO/TC42 Digital Camera Resolution Standards to Mobile Imaging Products
There are no fundamental differences between today's mobile telephone cameras and consumer digital still cameras that suggest many existing ISO imaging performance standards do not apply. To the extent that they have lenses, color filter arrays, detectors, apertures, image processing, and are hand held, there really are no operational or architectural differences. Despite this, there are curren...
متن کاملThe Impact of Business Intelligence on Marketing Performance with Moderating Role of Environmental Turbulence
In today's complex, dynamic and constantly changing environment, companies need to design and take systems and methods that can help them adapt themselves to the changeable and dynamic situation of competitive markets, and therefore improving marketing performance and generally the company’s performance. In this regard, business intelligence systems as a new method and tool can be considered as...
متن کاملRelationship of ISO 9001:2000 quality system certification with operational and business performance A survey in Australia and New Zealand-based manufacturing and service companies
Purpose – This research paper aims to explore the relationship between ISO 9000 certification and organisational performance by developing an ISO 9000 relationship model. Design/methodology/approach – A survey instrument was used for quantitative data collection based on a global survey in collaboration with the Anderson School of Business, UCLA. All items were measured on a five point modified...
متن کاملذخیره در منابع من
با ذخیره ی این منبع در منابع من، دسترسی به آن را برای استفاده های بعدی آسان تر کنید
عنوان ژورنال:
دوره شماره
صفحات -
تاریخ انتشار 2006