Virtual Human Vision Lab

Important: *.xmp files generated from a 2024 R2 version or subsequent cannot be opened with a prior version to 2024 R2.

The human eye has a great dynamic to detect levels of luminance going from 10-6 cd/m² to 108 cd/m². Unfortunately most of media used to display luminance map obtained using Ansys software do not have such a dynamic. As an example, a monitor has a dynamic lower than one hundred.

With Virtual Human Vision Lab, you can reproduce visual appearance of modeled scenes on this media.

Virtual Human Vision Lab restores contrasts perceived by an observer placed in the scene.

Warning: All luminance map fields having luminance lower than the detection threshold of the human eye are not displayed. This threshold depends on the luminance to which the eye is adapted. It takes into account properties of the various eye photoreceptors.

Those can be classified in two families:

  • The first one is called cone and intervenes in the process of colors perception.

  • The second, called rod, is more sensitive and with it you can perceive luminance lower than 0.001 cd/m² for which cone sensitivity is insignificant.

    Under this condition, this is the case of a scotopic vision for which you do not have colors perception.

    When luminance becomes higher than approximately 5 cd/m², the rods are subjected to a phenomenon of saturation. This vision only results in the cones and is called the photopic vision.

    When the luminance of adaptation is between 0.005 cd/m² and 5 cd/m², cones and rods intervene in the vision process. One is then in mesopic vision.

Note: To restore the perception of contrasts as well as possible, Virtual Human Vision Lab takes into account the luminance of the used screen to display the luminance map.
Warning: White Point Luminance value has to be the maximum luminance of a white zone displayed by the used screen. For more details, you can view Monitor.