Table 7.

Multi-Focus fusion techniques reported in literature

Authors	Neural networks classifications				Wavelet based classifications						Contourlet based classifications			Other classifications
	ANN	PNN	PCNN	SPCNN	DWT	SWT	CWT	LSW	DCT	DT-CWT	CT	NSCT	NSST	PCA	HIS	Entropy	Fuzzy	EOG	HMM	Avg
Maruthi [4]	p		p	p	p	p	p		p		p	p	p	p			p	p	p
Wang [95]
Bhatnagar [105]
Anish [108]			p		p	p					p	p	p				p	p	p
Li [109]			p					p			p	p
Wang [110]			p	p	p
Li [111]	p	p			p
Huang [112]			p		p													p
Garg [113]			p		p			p
Kaur [114]			p		p				p	p		p		p	p				p
Kaur [115]									p					p
Liu [116]									p
Malhotra [117]					p									p
Sulaiman [118]					p				p			p		p
Li [119]					p						p	p
Haghigha [120]					p				p											p
Tian [121]					p
Yang [122]	p		p		p															p
Malik [123]									p									p
Chai [124]					p			p
Qu [125]					p							p				p
Maruthi [126]			p								p

Here p represents the literature review on different fields in various categorizations by different authors

SPCNN, Standard PCNN, LSW, Lifting stationary wavelet, MWT, Wavelet transform, DDWD, Dual-tree wavelet transform, EOG, Energy of image gradient, HMM, Hidden markov modeling, PSO, Particle swarm optimization