# A 4-D Sparse FIR Hyperfan Filter for Volumetric Refocusing of Light Fields by Hard Thresholding

> Research article (2018 IEEE 23rd International Conference on Digital Signal Processing (DSP), 2018) · cited 18× · AI/ML

**Wikidata**: [openalex:W2913688651](https://www.wikidata.org/wiki/openalex:W2913688651)  
**Source**: https://4ort.xyz/entity/a-4-d-sparse-fir-hyperfan-filter-for-volumetric-refocusing-of-light-fields-by-hard-thresholding