Table 1.

Summary of major elements in single-pixel imaging.

Element	Choices	Advantages (*) and Disadvantages (^)
System architecture	Focal plane modulation	* Active or passive imaging. ^ Limited choice on modulation.
	Structured light illumination	* More choices for active illumination. ^ Active imaging only.
Modulation method	Rotating ground glass	* High power endurance; cheap. ^ Not programmable; random modulation only.
	Customized diffuser	* High power endurance; can be customized. ^ Not programmable; complicated manufacturing.
	LCD	* Greyscale modulation; programmable. ^ Slow modulation; low power endurance
	DMD	* Faster than LCD; programmable. ^ Binary modulation; not fast enough.
	LED array	* Much faster than DMD; programmable. ^ Binary modulation; structured illumination only.
	OPA	* Much faster than DMD; controllable. ^ Random modulation; complicated manufacturing.
Reconstruction algorithm	Orthogonal sub-sampling	* Not computationally demanding. ^ Requires a specific prior.
	Compressive sensing	* A computational overhead. ^ Needs only a general sparse assumption.