Effects of the camera's exposure time on Rolling Shutter based Optical Camera Communication Links.

This dataset contains 7281 example images of a Rolling shutter-based Optical Camera Communication Link. Those images are affected by increasing exposure times.Moreover, the transmitted symbol duration is increased. Both quantities are related to the ESR (Exposure to Symbol Ratio) that indicates how affected is the signal by the exposure time (ESR = symbol/exposure). The ESR ranges from 1 to 7 in steps of 0.5 units (i.e., the exposure time is 1 to 7 times the transmitted symbol time). Furthermore, the transmitted symbol time is related to the camera's row sampling frequency by the NPPS (Number of Pixels per Symbol) (NPPS = symbol/sampling). The NPPS ranges from 4 to 7 in steps of 0.5 units (i.e., the symbol time is 4 to 7 times the sampling frequency of the camera).The purpose of this dataset is to provide:A tool for analyzing how the exposure time affects the received signal.A tool for validating novel artificial-based approaches for the exposure equalization of the received signal.A tool for validating novel estimator models of the intrinsic parameters of the received signal.It contains a CSV file with the following columns:sample_uuid: UUID used to identify the image file.relative_path: Relative path where the image files can be found.dims: The image file dimensions (1080,1920,3)tclk: The reference clock tick used as the time resolution.sampling_ticks: The number of ticks for sampling period. (Sampling period = sampling_ticks * tclk)exposure_ticks: The number of ticks for the exposure time. (Exposure time = exposure_ticks*tclk)txsymbol_ticks: The number of ticks for the symbol duration. (Symbol duration = txsymbol_ticks*tclk)npps: The ratio between txsymbol_ticks and sampling_ticksesr: The ratio between exposure_ticks and txsymbol_tickscamera_model: The camera used (PiCamera V2)analog_gain: Analog gain of the camera.digital_gain: Digital gain of the camera.awbg_gains: Vector containing the relative gains of the blue and green vs the red channel. (Used to control the white image balance).led_color: Label for the lamp used.power: The power units of the signal.power_reference: Label for the power level unit.modulation: Modulation used. (On-Off Keying (OOK))encoding: The encoding strategy for the data. (NRZ Manchester encoding)framing: Framing strategy of the packets. (11111-ABC~C-0). This case represents five one-bit headers, followed by bit A, bit B, and bit C, then the NOT version of bit C (stuffed bit), and a zero-bit trailer.data_length: Length of the payload.data: The payload bits.