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Using a color machine vision system, three types of light sources, incandescent, halogen, and fluorescent lamps were evaluated. The fluorescent lamp was also tested with a light controller incorporated as part of its power supply. Output gray levels from the three bands of the camera (red, green, and blue) were recorded for a range of lamp supply voltages and for an 8 h period with constant lamp supply voltages. Illumination uniformities over the field of view (FOV) of the camera were also examined. Given a I V change from the rated supply voltage, the maximum changes among the three color components occurred in the blue (1.8%), blue (1.3%), green (0.5%), and green (0.5%) bands for the incandescent, halogen, fluorescent, and controlled fluorescent lamps, respectively. Under constant lamp voltages for an 8 h period, the lamp outputs decreased by 4.7, 5.0, 7.7, and 1.2%, for the incandescent, halogen, fluorescent, and controlled fluorescent lamps, respectively. The illumination levels over the FOV were uniform, with average column intensities varying by less than 2.1, 2.1, 3.1, and 3.1% of the overall image intensity means, for the incandescent, halogen, fluorescent, and controlled fluorescent lamps, respectively. The average row intensity variations were less than the average column intensity variations.
X. Luo. D.S. Jayas. T.G. Crowe and N.R. Bulley 1997. EVALUATION OF LIGHT SOURCES FOR MACHINE VISION. Canadian Agricultural Engineering 39(4):309-315.
Canadian Society for Bioengineering