Image synthesis circuit design using selector-logic-based alpha blending and its FPGA implementation

Alpha blending is one of image synthesis techniques, which synthesizes a new image by summing up weighted input images and realizes transparent effect. In this paper, we focus on alpha blending using selector logics and implement it on an FPGA board. By applying selector logics to the alpha blending operation, its total product terms are decreased and thus a circuit size and circuit delay are improved simultaneously. In our implementation, original pixel values are stored into a memory on the FPGA board and then a new pixel value is synthesized based on input transmittance factors. We realize approximately 23% speed-up and 8% area reduction simultaneously using selector-logic based alpha blending.