According to papers, Image intensity has relationship with light intensity,
$L = ch(v)$
where $L$ is image intensity, $v$ is light intensity, $h$ is a nonlinear function $0<h(v)<1$ and c is contant.
But what if light is located in front of camera like the picture below? Yellow circle indicates light, a line two layered sheet and blue object camera. Is the equation above still valid in this case? I can understand values of c and L and shape of h will be different. The relationship might be the same, I suspect, in this case.