To Extend the Depth of Field Based on Image Processing

A camera with larger depth of field is very useful in many fields for it will overcome the limit of image range of optical system. With the development of computer and information technology, some new methods which can extend the depth of field based on image processing are attractive. One method is image fusion, which select the sharply focus part from a serial image and compose a new image. Another method is image restoration, which need a special phase mask in the optical system. The transfer function is not sensitive to object distance, so the image restoration algorithm can be used. Results show that the two methods have advantages of themselves.