Color quantization and optimization of luminance for digital mirror device–based projector

Projectors using digital mirror devices (DMDs) are widely used in consumer electronics. DMDs can switch between the ON and OFF states. Light is reflected by the DMDs, and a binary image is projected onto a screen. Full-color images can be represented by switching 24-binary images rapidly. To increase the frame rate, it is necessary to speed up the DMD switching. However, this is difficult because the switching time is limited by the mechanical constraints of the DMD. One solution is reducing the number of binary images to represent a full-color image. This paper proposes a framework for optimizing the color quantization and light-emitting diode (LED) luminance. The constructed system was evaluated by using a projector and complementary metal-oxide-semiconductor (CMOS) camera. The experimental results indicated that the proposed method improves the total luminance of a projected image approximately 122% compared to previous models and produces better image quality1.