Inicio > Accesorios, Fotografía > Carta de test de objetivos ISO 12233

Carta de test de objetivos ISO 12233

Miércoles, 3 septiembre 2008 Deja un comentario Go to comments

Hola,

para los interesados en probar la definición de sus objetivos, os dejo la carta de pruebas de objetivos ISO 12233 en formato pdf lista para su impresión.

La carta original la podeis descargar aquí.

Guías para usar la carta.

Para usar correctamente la carta se pueden seguir los siguientes consejos:

The chart should be illuminated uniformly (±10% of center luminance) against a surround of low reflectance and with a minimum of flare light. The illuminant should be effectively neutral with respect to either daylight or tungsten illuminants (ISO-7589). Camera white balance should be adjusted to provide equal red, green and blue signal levels.

The camera should be positioned to provide centered, full-frame-height rendering of the chart’s active area. Use the chart’s framing arrows and horizontal edges to aid positioning. The camera to test chart distance should be noted.

Use the chart’s central zone plate feature to set good focus.

Set camera lens aperture and exposure time to provide maximum signal from white areas while avoiding any signal clipping.

Where possible, image compression features should be disabled.

Camera output signal should be linearized using the standard reflection camera OECF (Opto-Electronic Conversion Function) test chart, Applied Image part number ST-52-RM.

Line width features can be viewed with any file viewer for an indication of the visual resolution limits of the device. International Standard Document ISO-12233 contains instruction regarding a quantitative determination of resolution limits. Visual and limiting resolution values should be reported in values of lw/ph.

Slant-edge features can be analyzed using SFR software freely available throughwww.i3a.org. This topic is also described in greater detail in the International Standard Document ISO-12233.

Aliasing level is determined using the slanted burst patterns. It is quantified for each frequency by the ratio of the maximum minus minimum responses divided by the difference of average maximum minus average minimum within each frequency burst.

PopPhoto que explica el uso y como leer los resultados

 

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