Fig. 1. Flowchart of depth estimation algorithm based on defocus and correspondence

Fig. 2. Comparison of second-order derivative operators. (a) Traditional Laplace operator; (b) proposed second-order derivative operator for energy enhancement

Fig. 3. Comparison of depth evaluation results obtained based on "shoe" image. (a) Light field raw image; (b) depth map calculated by DCDC algorithm; (c) depth map calculated by proposed method

Fig. 4. Comparison of defocus response curves. (a) Defocus response curves obtained based on Laplace operator; (b) defocus response curves obtained based on proposed energy enhanced second-order derivative operator

Fig. 5. Comparison of depth evaluation results for "stapler" image. (a) Light field raw image without redundancy; (b) depth map calculated by DCDC algorithm; (c) depth map calculated by proposed method

Fig. 6. Two sample images in benchmark dataset. (a) "boxes" scene; (b) "dino" scene

Fig. 7. Comparison of depth evaluation results for "boxes" scene. (a) Ground truth; (b) depth map calculated by DCDC algorithm; (c) depth map calculated by proposed method

Fig. 8. Comparison of depth evaluation results for "dino" scene. (a) Ground truth; (b) depth map calculated by DCDC algorithm; (c) depth map calculated by proposed method