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

This dataset contains <b>7281</b> example images of a <b>Rolling shutter</b>-based <b>Optical Camera Communication</b> Link. Those images are affected by <b>increasing exposure times</b>.Moreover, the transmitted symbol duration is <b>increased</b>. Both quantities are related to the <b>ESR</b> (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 <b>NPPS</b> (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 <b>analyzing</b> how the exposure time affects the received signal.A tool for <b>validating</b> novel artificial-based approaches for the exposure equalization of the received signal.A tool for <b>validating</b> novel estimator models of the intrinsic parameters of the received signal.It contains a CSV file with the following columns:<i>sample_uuid</i>: UUID used to identify the image file.<i>relative_path</i>: Relative path where the image files can be found.<i>dims</i>: The image file dimensions (1080,1920,3)<i>tclk</i>: The reference clock tick used as the time resolution.<i>sampling_ticks</i>: The number of ticks for sampling period. (Sampling period = sampling_ticks * tclk)<i>exposure_ticks</i>: The number of ticks for the exposure time. (Exposure time = exposure_ticks*tclk)<i>txsymbol_ticks</i>: The number of ticks for the symbol duration. (Symbol duration = txsymbol_ticks*tclk)<i>npps</i>: The ratio between txsymbol_ticks and sampling_ticks<i>esr</i>: The ratio between exposure_ticks and txsymbol_ticks<i>camera_model</i>: The camera used (PiCamera V2)<i>analog_gain</i>: Analog gain of the camera.<i>digital_gain</i>: Digital gain of the camera.<i>awbg_gains</i>: Vector containing the relative gains of the blue and green vs the red channel. (Used to control the white image balance).<i>led_color</i>: Label for the lamp used.<i>power</i>: The power units of the signal.<i>power_reference</i>: Label for the power level unit.<i>modulation</i>: Modulation used. (On-Off Keying (OOK))<i>encoding</i>: The encoding strategy for the data. (NRZ Manchester encoding)<i>framing</i>: 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.<i>data_length</i>: Length of the payload.<i>data</i>: The payload bits.

本数据集包含**7281**张基于**卷帘快门（Rolling shutter）**的**光学相机通信（Optical Camera Communication）**链路示例图像。这些图像随**曝光时长递增**产生变化。此外，传输符号时长亦呈递增趋势。上述两个参数均与**ESR（曝光符号比，Exposure to Symbol Ratio）**相关，该指标用于表征信号受曝光时长的影响程度，计算公式为ESR = 符号时长/曝光时长。ESR的取值范围为1至7，步长为0.5，即曝光时长为传输符号时长的1至7倍。

传输符号时长还与相机行采样频率相关，通过**NPPS（每符号像素数，Number of Pixels per Symbol）**表征，计算公式为NPPS = 符号时长/采样周期。NPPS的取值范围为4至7，步长为0.5，即符号时长为相机采样周期的4至7倍。

本数据集旨在提供三类工具：一是用于**分析**曝光时长对接收信号的影响；二是用于**验证**面向接收信号曝光均衡的新型人工智能方法；三是用于**验证**接收信号固有参数估计的新型模型。

数据集包含一个CSV文件，各字段说明如下：
- `sample_uuid`：用于标识图像文件的通用唯一识别码（UUID）
- `relative_path`：图像文件的相对存储路径
- `dims`：图像文件的尺寸，格式为(1080, 1920, 3)
- `tclk`：作为时间分辨率基准的参考时钟节拍
- `sampling_ticks`：采样周期对应的节拍数（采样周期 = sampling_ticks × tclk）
- `exposure_ticks`：曝光时长对应的节拍数（曝光时长 = exposure_ticks × tclk）
- `txsymbol_ticks`：传输符号时长对应的节拍数（符号时长 = txsymbol_ticks × tclk）
- `npps`：txsymbol_ticks与sampling_ticks的比值，即每符号像素数
- `esr`：exposure_ticks与txsymbol_ticks的比值，即曝光符号比
- `camera_model`：所用相机型号（PiCamera V2）
- `analog_gain`：相机的模拟增益
- `digital_gain`：相机的数字增益
- `awbg_gains`：包含蓝、绿通道相对于红通道相对增益的向量，用于控制图像白平衡
- `led_color`：所用光源的颜色标签
- `power`：信号的功率值
- `power_reference`：功率单位的标识标签
- `modulation`：所用调制方式（开关键控（On-Off Keying, OOK））
- `encoding`：数据编码策略（非归零曼彻斯特编码（NRZ Manchester encoding））
- `framing`：数据包的帧结构策略（11111-ABC~C-0），具体含义为：5个前导1比特、比特A、比特B、比特C、比特C的取反（填充比特）以及1个收尾0比特
- `data_length`：有效载荷的比特长度
- `data`：有效载荷比特序列