ISO 12233-2014 pdf free.Photography一Electronic still picture imaging一Resolution and spatial frequency responses.
ISO 12233 specifies methods for measuring the resolution and the SFR of electronic still-picture cameras. It is applicable to the measurement of both monochrome and colour cameras which output digital data or analog video signals.
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 14524, Photography 一Electronic sill-picture cameras一Methods for measuring opto-electronic conversion functions (OECFs)
3 Terms and definitions
For the purposes of this document, the fllowing terms and definitions apply.
3.1 addressable photoelements number of active photoelements in an image sensor
Note 1 to entry: This equals the product of the number of active photoelement lines and the number of active photoelements per line.
3.2 aliasing output image artefacts that occur in a sampled imaging system due to insuficient sampling
Note 1 to entry: These artefacts usually manifest themselves as moire patterns in repetitive image features or as jagged stair-stepping at edge transitions..
3.3 cycles per millimetre cy/mm spatial frequency unit defined as the number of spatial periods per millimetre
3.4 edge spread function ESF normalized spatial signal distribution in the linearized output of an imaging system resulting from imaging a theoretical infinitely sharp edge
3.5 effectively spectrally neutral having spectral characteristics which result in a specific imaging system producing the same output as for a spectrally neutral object
electronic still-picture camera
camera incorporating an image sensor that outputs an analog or digital signal representing a still picture
Note 1 to entry: This camera may also record or store an analog or digital signal representing a still picture on a
removable media, such as a memory card or magnetic disc.
3.7 gamma correction signal processing operation that changes the relative signal levels
Note 1 to entry: Gamma correction is performed in part to correct for the nonlinear light output versus signal input characteristics of the display. The relationship between the light input level and the output signal level, called the camera opto-electronic conversion function (OECF), provides the gamma correction cuirve shape for an image capture device.
Note 2 to entry: The gamma correction is usually an algorithm, lookup table, or circuit which operates separately on each colour component of an image.
3.8 horizontal resolution resolution value measured in the longer image dimension, corresponding to the horizontal direction for a “landscape” image orientation, typically using a vertical or near vertical oriented test-chart feature image aspect ratio ratio of the image width to the image height
3.10 image compression process that alters the way digital image data is encoded to reduce the size of an image file
3.11 image sensor electronic device that converts incident electromagnetic radiation into an electronic signal EXAMPLE Charge coupled device (CCD) array, complementary metal-oxide semiconductor (CMOS) array.
3.12 line pairs per millimetre lp/mm spatial frequency unit defined as the number of equal width black and white line pairs per millimetre
3.13 line spread function LSF normalized spatial signal distribution in the linearized output of an imaging system resulting from imaging a theoretical infinitely thin line.ISO 12233 pdf free download.
Tags: Photography
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