Single-Pixel Centroid Detection With DMD Light Modulation

The patent segments the detection process into multiple sequential measurements using different modulation patterns (three distinct 2D array matrices). Instead of capturing the entire image simultaneously with a CCD sensor, the single-pixel detector sequentially samples the light field modulated by the DMD with different patterns, dividing the detection task into multiple controlled steps that can be processed to extract centroid information while rejecting background light.

The patent changes the modulation parameter by using three different 2D array matrices (A, B, and C) with distinct patterns on the DMD. Each matrix represents a different modulation state that encodes spatial information. By varying the modulation pattern across multiple measurements and combining the results through centroid solving algorithms, the system achieves precise centroid detection while the single-pixel detector maintains immunity to background light interference.

The single-pixel detector serves multiple functions: it detects the modulated light signal, extracts spatial information through sequential sampling with different patterns, and achieves centroid detection capability. The DMD similarly performs multiple roles by generating different modulation patterns and encoding spatial information. This multi-functionality allows the system to achieve CCD-like imaging capability with a single-pixel detector, improving SNR while managing complexity through functional integration.

The patent uses the DMD to create multiple copies of the light field with different modulation patterns (three distinct 2D array matrices). Each patterned light field is a copy of the original scene encoded with specific spatial information. By capturing these modulated copies sequentially with the single-pixel detector and processing them through centroid solving algorithms, the system reconstructs centroid information that would otherwise require simultaneous capture by a multi-pixel sensor.