Focus Measure of Light Field image using Modified- Laplacian and Weighted Harmonic Variance

A light field image generates a set of focusing images at different depth levels. When we reconstruct an allfocused image, we have to identify in-focused regions of the stack images. To address this problem, we propose a method to detect in-focused image regions. We employ sum-modified-laplacian and weight harmonic variance algorithms to solve the problem. The proposed method provides a focus measurement to select suitable in-focused areas of the stack images. Therefore, only regions with a sharp focus will have high responses. Finally, the process can detect the in-focused image regions. In addition, we also acquire an all-focused image by this algorithm. Experiment results demonstrate that the proposed approach can provide better performance in comparison to traditional methods. Keywords—light field image; all-focused image; in-focused regions; sum-modified-laplacian; weighted harmonic variance.