Le Van Nhu, Chen Shouqian, Fan Zhigang
Opt Lett. 2014 Apr 1;39(7):2171-4. doi: 10.1364/OL.39.002171.
Wavefront coding as an optical-digital hybrid imaging technique can be used to extend the depth of field. The key to wavefront coding lies in the design of suitable phase masks to achieve the invariant imaging properties over a wide range of defocus. In this Letter, we propose another phase mask with a tangent function to enrich the odd symmetrical kind of phase masks. The performance of the tangent phase mask is evaluated by comparison with a cubic mask, improved-1 logarithmic mask, improved-2 logarithmic mask, and sinusoidal mask. The results demonstrate that the tangent phase mask has superior performance in extending the depth of field.
波前编码作为一种光学-数字混合成像技术可用于扩展景深。波前编码的关键在于设计合适的相位掩膜，以在大范围离焦情况下实现不变的成像特性。在本信函中，我们提出了另一种具有正切函数的相位掩膜，以丰富奇对称类型的相位掩膜。通过与立方掩膜、改进-1对数掩膜、改进-2对数掩膜和正弦掩膜进行比较，评估了正切相位掩膜的性能。结果表明，正切相位掩膜在扩展景深方面具有卓越的性能。
