A ROI Focusing Mechanism for Digital Cameras

摘要

With the development and application of digital technologies, the digital camera is more popular than other electronic products for all ages. The operations of digital cameras are facile and the user interface is similar in most brands. Auto-focusing is a common but important feature both for still image photography and video photography. Traditionally, focusing sensors are utilized for auto-focusing systems; in this study, we propose a new auto-focusing mechanism which uses the image sensor directly for measuring and estimating the focal distance. After the image is captured by Charge Coupled Device (CCD) or Complementary Metal-Oxide-Semiconductor (CMOS) image sensors, users will select Region of Interest (ROI) and the system can explore the in-focus image automatically. The experimental results show the proposed mechanism has superior precision and elasticity of auto-focusing.