BS ISO 18221:2016 pdf download

BS ISO 18221:2016 pdf download.Microscopes — Microscopes with digital imaging displays — Information provided to the user regarding imaging performance
1 Scope
This International Standard specifies the minimum information to be provided to the user by the manufacturers of microscopes with digital displays regarding imaging performance.
It further specifies terms and definitions for describing the optical performance of the digital imaging path of microscopy systems including the observation of the image on digital displays.
NOTE Terms and definitions for the direct visual observation with eyepieces are specified in ISO 8039 and ISO 10934-1.
2 Normative references
The following documents, in whole or in part, are normatively referenced in this document and are indispensable for its application. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies.
ISO 10934-1, Optics and optical instruments — Vocabulary for microscopy — Part 1: Light microscopy
ISO 10934-2, Optics and optical instruments — Vocabulary for microscopy — Part 2: Advanced techniques in light microscopy
3 Terms and definitions
For the purposes of this document, the terms and definitions given in ISO 10934-1, ISO 10934-2 and the following apply.
NOTE Terms shown in italics within a definition or a note are defined elsewhere within this International Standard or in ISO 10934.
3.1 digital microscopy system
instrument consisting of an objective, an image sensor (3.2) and a digital display (3.3) to make visible minute details that are not seen with unaided eye
Note 1 to entry: The system might include means for image enhancement, image analysis, archiving, etc.
3.2 image sensor
device to transform an optical image into a digital image
3.3 digital display
output device for the visual presentation of a digital image and other information
3.4 resolving power limit
maximum spatial frequency distinguishable in object space, expressed in lp/mm
Note 1 to entry: The resolving power actually achieved will always be lower than the resolving power limit due to reduced contrast, moiré patterns, etc. In addition, it depends on sensor type, object structure, illumination, etc.
3.5 pixel pitch
distance between the centres of adjacent pixels (picture elements) in an image sensor (3.2) or a digital display (3.3)
3.6 line pair
one line and one space between the lines of a spatial grid with equal line thickness and space width between lines
3.7 viewing distance
distance between the digital display (3.3) and the observer’s eye
5 Magnification
5.1 Optical magnification, M TOT PROJ
M TOT PROJ is the lateral magnification at the image projected onto the image sensor. It should be expressed in proportional form, e.g. 10:1.
5.2 Display magnification, M DIS
M DIS is the lateral magnification at the digital image presented on the digital display or monitor. It should be expressed in proportional form, e.g. 100:1.
NOTE The display magnification, M DIS , is the ratio of a given distance in the image presented on the monitor to the corresponding distance in the object.