Through-Wall Image Enhancement Using Fuzzy and QR Decomposition

Table 1

Comparison analysis of QRD algorithms for TWI.

Algorithms	Accuracy				Complexity	Stability
	𝑀−𝑄𝑅	𝑄^𝑇𝑄−𝐼	𝑄^𝑇𝑀−𝑅	𝑀𝑅^−1−𝑄
CGS QR	1.091×10^−16	1.310×10^−10	6.724×10^−14	9.913×10^−14	2𝐺𝐻^2	Unstable
MGS QR	1.075×10^−16	4.922×10^−13	4.842×10^−14	1.083×10^−12	2𝐺𝐻^2	Stable
HT QR	1.291×10^−15	3.795×10^−15	3.333×10^−16	1.263×10^−12	4𝐺^2𝐻+2𝐺𝐻^2+23𝐻^3	Stable
Givens QR	7.532×10^−16	6.702×10^−15	2.711×10^−16	1.118×10^−12	8𝐺^2𝐻+2𝐺𝐻^2+23𝐻^3	Stable