Capturing Pictures from Human Vision Using SSVEP and Lock-in Amplifier

• Danson Evan Garcia MannLab Canada
• Kai Wen Zheng MannLab Canada
• Yi Tao MannLab Canada
• Yi Liu MannLab Canada
• Steve Mann MannLab Canada

Resumo

We present a novel way of using one's eye to capture an image of what it "sees" through the use of steady-state visually-evoked potentials (SSVEP). Existing methods leveraging response patterns for SSVEP visual image reconstruction show lossy reconstruction and have a lengthy scanning process. With our signal acquisition procedure, data collection requirements are significantly decreased while still improving the signal clarity. The data for image reconstruction was collected from the Oz positioned electrode using a low-cost, wearable electroencephalography (EEG) device. For image reconstruction, software-defined lock-in amplifier (LIA) and discrete Fourier transform (DFT) signal processing methods are analyzed.

Palavras-chave: Signal processing, visual field reconstruction, brain-computer interfaces (BCI), steady-state visually evoked potential (SSVEP), lock-in amplifier, pattern recognition