A system and method corrects luminance non-uniformity caused by images being obliquely projected onto a screen. In this context, it is provided, in particular, to apply the principles of the present invention to the supplying of voltage to electronic consumers in motor vehicles. Embodiments of the invention may also take the form of a camshaft position temperature compensation system having a memory, a gradient processing module, a temperature sensor, a camshaft position sensor, and an approximation module. The image comparing unit is utilized for comparing the image data captured by the image capturing unit and the plurality of road image data stored in the image database, so as to generating a comparing result.