IMAGING METHOD AND SYSTEM WITH OPTIMIZED EXTENDED DEPTH OF FOCUS

摘要

An optical processor is presented for applying optical processing to a light field passing through a predetermined imaging lens unit. The optical processor comprises a pattern in the form of spaced apart regions of different optical properties. The pattern is configured to define a phase coder, and a dispersion profile coder. The phase coder affects profiles of Through Focus Modulation Transfer Function (TFMTF) for different wavelength components of the light field in accordance with a predetermined profile of an extended depth of focusing to be obtained by the imaging lens unit. The dispersion profile coder is configured in accordance with the imaging lens unit and the predetermined profile of the extended depth of focusing to provide a predetermined overlapping between said TFMTF profiles within said predetermined profile of the extended depth of focusing.

主权项

1. An imaging lens unit comprising: a lens having a certain optical power and depth of focus, and first and second patterns carried by the lens, the first pattern being formed by a predetermined number of phase transitions being of substantially the same transparency and arranged with a low spatial frequency, so as to induce substantially non-diffractive phase effect onto the light field, and a second pattern being substantially diffractive to induce dispersion and which is configured to provide a predetermined optical power addition to the imaging lens, such that total optical power of the imaging lens unit corresponds to a desired optical power, dispersion and depth of focus properties of the imaging lens unit.