Related Experiment Video
Updated: Jun 17, 2026

A Standardized Approach to Extra-Oral and Intra-Oral Digital Photography
Published on: July 22, 2022
Photographic standardization and research at the national bureau of standards
1National Bureau of Standards, Washington, DC 20234, USA.
Abstract:
The Image Optics and Photography Section of the National Bureau of Standards provides physical standards of measurement and calibration services, cooperates with national and international standardizing organizations, and conducts research related directly to the utilization of photographic materials and processes. Standardization and research in sensitometry, standard light sources, emulsion making, preservation of photographs, precise densitometry, and image evaluation have spanned a half century.
More Related Videos
Related Concept Videos
Standard Solutions
Instrument Calibration
Analytical Balance Calibration
An analytical balance measures mass and requires regular calibration to...
Units and Standards of Measurement
Measurements of physical quantities are...
Units and Standards of Measurement
Measurements of physical quantities are...
Testing a Claim about Standard Deviation
The hypothesis testing for the claim of population standard deviation (or variance) requires the data and samples to be random and unbiased. The population distribution also must be normal. There is no specific requirement on the sample size as the estimation is based on the chi-square distribution.
As a first step, the hypothesis (null and alternative) concerning the claim about...

