| 摘要 |
<p>A system (8) for imaging with a circularly symmetric multifocal aspheric lens (14) is provided for obtaining an extended depth of field. The system includes a camera (10) for capturing an image of at least one object (13) through a circularly symmetric multifocal aspheric lens (14) to provide a blurred image, and a computer system (16) for processing the captured blurred image to provide a recovered image of the object having an extended depth of field. The recovered image may be outputted to a display (18) or other peripheral device. Processing of the blurred image utilizes one of inverse filtering, convolution matrix (e.g., edge sharpening matrix), or maximum entropy. The computer system (10) performing image processing may be in the camera or represent a computer system external to the camera which receives the blurred image. Multifocal aspheric lens (14) may represent one or more optical elements, such as a phase-plate (14a) used in combination with an objective lens (15) of the camera. The extended depth of field is characterized by the object being in focus over a range of distances in the recovered image.</p> |
