Liang Hu, Xuejuan Hu, Zhenhong Huang, Lu Xu, Lijin Lian. Multi-Focus Image Fusion Based on Discrete Walsh-Hadamard Transform and Guided Filtering[J]. Laser & Optoelectronics Progress, 2021, 58(22): 2210003
- Laser & Optoelectronics Progress
- Vol. 58, Issue 22, 2210003 (2021)
Fig. 1. Sharp and blurred images and their DWHT results. (a) Sharp image; (b) blurred image; (c) DWHT of Fig.1 (a); (d) DWHT of Fig.1 (b)
Fig. 2. Block diagram of proposed algorithm
Fig. 3. Focus region detection based on DWHT
Fig. 4. Generation process of final decision map. (a) Initial decision map IDM (x,y); (b) small patch removing operation MD1 (x,y); (c) morphology operation MD2 (x,y); (d) final decision map FDM (x,y)
Fig. 5. Three groups of multi-focus source images. (a) Clock; (b) book; (c) golf
Fig. 6. Clock’s fusion images and corresponding residual images of different methods. (a)(f) GFF; (b)(g) MWGF; (c)(h) CNN; (d)(i) DCT; (e)(j) proposed method
Fig. 7. Enlarged images of labeled regions in Fig. 6
Fig. 8. Multi-sequence focused images. (a) Multi-sequence gravure pattern appearance images; (b) multi-sequence lithium battery pole piece images
Fig. 9. Multi-focus fusion results of multi-sequence gravure pattern appearance image. (a) GFF; (b) CNN; (c) DCT; (d) proposed method
Fig. 10. Multi-focus fusion results of multi-sequence lithium battery pole piece image. (a) GFF; (b) CNN; (c) DCT; (d) proposed method
Fig. 11. Enlarged images of labeled regions in Fig. 10 . (a) GFF; (b) CNN; (c) DCT; (d) proposed method
Fig. 12. Quality evaluation of multi-focus sequence image fusion
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Table 1. Average evaluation metrics of three groups of multi-focus source images under different methods
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