Document ID: chunk:federal_register_of_legislation:F2024C00148:reg:1:p34
Version: federal_register_of_legislation:F2024C00148
Segment Type: reg
Provision Reference: reg 1 (pt 34/34)
Character Range: 228961–231154

into lens
              8: Camera-side
              9: Monitor-side
Figure 5 shows an example of a grey scale rendering chart to be used in this measurement. The grey scale rendering chart shall consists of 12 different tonal density grey patches.
              The density value Di shall follow the values as defined by ISO 14524:2009 Table A.1 for low contrast 20:1. The definition of Di is given in the ISO 14524:2009.

              The background of the patches shall be covered with a neutral grey colour having a density value Di of 0.54 ± 0.05.

              Both reflective and transmissive charts with Lambertian characteristics can be used.

              The whole camera image area shall be covered by the chart image. The grey scale rendering chart shall be placed in such a way so that the grey patches are visible in the centre of the monitor defined size.

              Adjust the distance between the camera under test and the test chart to have individual patches of the chart displayed by at least 50 x 50 pixels on the monitor under test, whenever possible. For Class IV devices exhibiting high distortion and/or optical vignetting, a reduced size area may also be used to minimize the vignette effect on the measurement results.

              The illumination shall be similar to the CIE D65 standard illuminant and have a correlated colour temperature of T = 6,500 K with a tolerance of ±1,500 K.

              The test is performed with a scene illumination of 500 lx (this test condition is equivalent to test condition for colour rendering as defined in ISO 16505:2015 clause 7.8.3), and at room temperature 22 °C ± 5 °C.

              Ambient illumination at the monitor-side shall be ≤ 10 lx, and glare light source to the monitor shall be avoided.

              Figure 5
              Example of the grey scale rendering chart
              Each patch on the grey scale rendering chart shall have a size of 50 x 50 mm. The distance between the patches shall be 5 mm.

              Table 1 shows density value Di of the 12 different grey patches as well Di of the background.

              Table 1
              Density values Di
Grey patch No.  Density Di