Spatial Frequency Domain Imaging With Reduced-Bit Sinusoidal Modulation

The patent changes the parameter of coded bit length from traditional long sequences to shortened sequences (e.g., reducing from 32 bits to 8 bits or fewer). This parameter change allows the system to maintain adequate measurement precision while dramatically improving measurement speed, as fewer bits require fewer modulation cycles and less data processing time

The patent applies partial action by using only the essential minimum number of coded bits needed to achieve acceptable measurement precision, rather than using excessive long sequences. This partial approach (using fewer bits than traditional methods) is sufficient to capture the necessary optical property information while significantly reducing measurement time

The patent changes the waveform parameter from square wave to sinusoidal pattern. This parameter change enables the system to accurately measure both low and high spatial frequencies, as the sinusoidal pattern provides smoother transitions and better frequency response characteristics compared to the abrupt transitions in square waves

The patent inverts the traditional approach by using sinusoidal patterns instead of square wave patterns for spatial frequency modulation. This inversion of the conventional waveform choice allows the system to achieve superior performance across the entire spatial frequency spectrum, particularly improving high frequency measurement capability while maintaining low frequency accuracy