Distinctness of image

In polluted air it is the sum of all particles of various dimensions (dust, aerosols, vapor, etc.)

[1] DOI is measured to characterize the visual appearance of polished high-gloss surfaces such as automotive car finishes, mirrors, beyond the capabilities of gloss.

Various categories of visual appearance related to the perception of regular or diffuse reflection and transmission of light have been organized under the concept of cesia in an order system with three variables.

RIQ has more proportionate response to orange peel on a wider range of surface finishes.

The blur induced by a scattering layer (here: frosted glass ) increases with the distance between the information (ruler scaling) and the scattering layer. The scattering layer is close to the ruler surface on the left side and the distance increases to the right as does the blur. The distinctness of image decreases with increasing blur.

Distinctness of Image DOI — **Distinctness of Image (DOI)** Low DOI is caused by “large” surface structures distorting the reflected light. The surface is visible- orange peel. $DOI\varpropto dR/d\Theta$ $DOI\propto {\frac {\Delta Reflectance}{\Delta Angle}}$

**Reflected image Quality (RIQ)**

RIQ is a more sensitive, updated version of DOI A new high sensitivity/high resolution sensor allows improved measurement.

**RIQ is a more sensitive, updated version of DOI** $DOI\varpropto dR/d\Theta$
$Haze\propto {\frac {\Delta Reflectance}{\Delta Angle}}$ A new high sensitivity/high resolution sensor allows improved measurement.