Light Scope

【Light Scope】

软件简介

LightScope是一款基于移动设备摄像头传感器的专业级光学测量工具，面向摄影师、影视工作者、照明设计师及UI/UX开发人员开发。通过创新的图像算法处理技术，该软件可将普通手机摄像头转化为精密的光学检测仪器，支持从照度、光强到色温的全维度光学参数分析，并具备专业级的图像质量评估能力。其核心技术突破传统测光设备依赖外接硬件的限制，利用EXIF元数据与RGB色彩空间转换实现多场景下的动态测量。

软件功能

【核心测量模块】

1. 照度实时检测：通过解析摄像头曝光参数（光圈值、ISO、快门速度）与校准系数，输出符合ISO标准的照度值（单位：lux）

2. 光源强度计算：结合用户设定的测量距离，自动执行平方反比运算（照度值×距离2）得出坎德拉(cd)值

3. 色温分析引擎：采用McCamy多项式算法实现RGB→XYZ色彩空间转换，支持1500K-15000K广域色温检测

4. 动态直方图：16级亮度分布图谱实时显示画面中阴影/中间调/高光的占比情况

5. 对比度检测：依据WCAG 2.1无障碍标准计算最大对比度比，特别适用于显示设备调试

6. 环境噪声分析：通过信号噪声比（SNR）计算评估当前拍摄环境的信噪质量

【专业扩展功能】

? 测量快照系统：同步保存测量时的全景图像与全部光学参数

? 多点触控检视：支持200%缩放与360°旋转的图像审查模式

? 设备相册直存：测量结果可一键保存至系统相册

? 历史数据云图：自动生成照度/色温的趋势曲线与统计报表

? 全屏测量模式：隐藏操作面板后仍保留核心参数的悬浮显示

软件特色

1. 智能降噪算法：采用10帧移动平均滤波技术，在低至1 lux照度下仍保持数据稳定性

2. 中心权重分析：对画面中央区域进行重点采样，避免环境光干扰主体测量精度

3. 双模曝光评估：通过直方图峰谷检测自动判断曝光过度/不足状态

4. 多光源兼容：特别优化对LED频闪光源、荧光灯混光环境的测量算法

5. 跨平台适配：深度适配iOS系统特性，支持动态色温的深色/浅色主题无缝切换

6. 个性化校准：开放F值校准系数调节，支持专业用户进行设备级参数微调

常见问题

Q1: 手机摄像头测量与传统照度计的误差范围？

A: 经实验室测试，在完成设备校准后，200-2000 lux常规照明环境下误差率≤±7%，建议定期使用标准光源进行系数校准。

Q2: 如何保证低光环境下的色温测量准确性？

A: 软件采用动态增益补偿技术，当环境照度＜10 lux时自动启用长曝光采样模式，配合CMOS噪点抑制算法提升数据可靠性。

Q3: 能否测量点光源的发光强度？

A: 需确保测量距离＞光源尺寸5倍以上，且背景光干扰＜目标光源强度的10%。建议使用遮光罩配件进行定向测量。

Q4: 历史数据是否支持导出？

A: 当前版本支持CSV格式测量数据导出，后续更新将增加与adobe Lightroom、DaVinci Resolve等专业软件的API对接。

Q5: 不同手机型号的测量一致性如何？

A: 因CMOS传感器差异，建议跨设备使用时进行基准校准。软件内置主流机型的预设校准参数库，涵盖iPhone 8至最新Pro系列机型。

Q6: 闪光灯瞬间亮度能否捕捉？

A: 受限于摄像头采样频率，建议使用专业级外置测光表检测瞬时闪光。本软件更适用于持续光源的稳态测量场景。

更新日志

LightScope is a comprehensive solution providing professional light measurement and analysis using your iOS device's camera sensor.

【Key Measurement Features】

? Illuminance (lux) Measurement: Calculates accurate illuminance by analyzing EXIF data from the camera sensor. Illuminance is derived using the formula: (F-number2 / (Exposure TIMe × ISO)) × Calibration Factor.

? Luminous Intensity (candela) Calculation: Automatically calculates the luminous intensity of a light source based on the set distance. Uses the formula: Illuminance (lux) × Distance2.

? Color Temperature (K) Analysis: Precisely measures color temperature in the range of 1500K~15000K by converting RGB values to XYZ color space using McCamy's formula.

? Real-time Histogram: Visualizes the balance of shadows, midtones, and highlights through 16-level brightness distribution analysis.

? Contrast Ratio Measurement: Evaluates the ratio between the brightest and darkest parts of a scene according to WCAG Accessibility standards.

? Noise Measurement (SNR): Calculates the signal-to-noise ratio in dB to evaluate image quality in the shooting environment.

【Advanced Features】

? Image Capture and Storage: Captures camera images at the time of measurement and stores them with measurement data.

? Full-screen Image View: Zoom, pan, and rotate captured images for detailed inspection.

? Gallery Saving: Save captured images to your device's photo library.

? Measurement History and Trends: Save all measurements chronologically and visualize trends with graphs.

? Camera Full-screen Mode: Hide panels to focus on the camera view while checking key measurements via a mini info panel.

? Perfect Dark/Light Mode Support: All UI elements automatically adapt to the system theme.

【User Settings】

? Illuminance Calibration: Adjust the calibration factor for more accurate measurements based on your environment.

? Distance Setting: Set the distance to the light source for precise luminous intensity (cd) calculations.

? Front/Rear Camera Selection: Choose the appropriate camera for your measurement situation.

【Technical Features】

? Support for measuring various light source types: natural light, LED, fluorescent, incandescent, etc.

? Algorithm optimization for stable color temperature calculation even in low-light environments

? 10-frame moving average filter for measurement stabilization

? Center-weighted image analysis for accurate evaluation of main subject quality

? Automatic exposure quality assessment based on histogram analysis

Perfect tool for photographers, Videographers, lighting designers, UI/UX developers, and anyone who needs accurate light measurements.