OV5640 自动对焦照相模组应用指南(MIPI 接口).pdf

【实例截图】

【核心代码】

内容目录
1. OV5640应用指南 ............................................................................................................................4
2. 硬件设计 ..........................................................................................................................................5
2.1 OV5640 照相模组原理图参考设计 .........................................................................................5
2.2 主机接口 ...................................................................................................................................6
2.1.1 引脚定义 ............................................................................................................................6
2.2 供电设计 ...................................................................................................................................6
2.3 与镜头相关参数 .......................................................................................................................7
2.3.1 边角失光 ............................................................................................................................7
2.3.2 暗角....................................................................................................................................7
2.3.3 分辨率 ................................................................................................................................7
2.3.4 光学对比度 ........................................................................................................................7
2.3.5 保护玻璃 ............................................................................................................................7
2.3.6 Lens补偿（镜头均匀性补偿） .......................................................................................7
2.3.6.1 Lens 补偿:..................................................................................................................7
2.3.6.2 Lens 补偿: .................................................................................................................7
3. 硬件操作 ..........................................................................................................................................8
3.1 操作模式 ...................................................................................................................................8
3.1.1 上电（ power up）.............................................................................................................8
3.1.2 节电模式 (Power Down)....................................................................................................9
3.1.3 由节电模式唤醒 ................................................................................................................9
3.1.4 断电....................................................................................................................................9
3.1.5 硬件复位 ..........................................................................................................................10
3.2 操作流程 .................................................................................................................................10
3.2.1 不使用时断电 ..................................................................................................................10
3.2.2 不使用时处于节电模式（ power down）......................................................................10
3.2.3 OV5640与其他设备共用 I2C 总线................................................................................11
4. 软件指南 ........................................................................................................................................12
4.1 单通道 MIPI 接口...................................................................................................................12
4.1.1 YCbCr 初始化参数 .........................................................................................................12
4.1.2 YCbCr VGA 预览 30帧/秒............................................................................................17
4.1.3 YCbCr 720p 视频 30 帧/秒............................................................................................18
4.1.4 YCbCr 5百万拍照 7.5帧/秒..........................................................................................19
4.2 双通道 MIPI 接口...................................................................................................................21
4.2.1 YCbCr 初始化参数 .......................................................................................................21
4.2.2 YCbCr VGA 预览 30帧/秒............................................................................................26
4.2.3 YCbCr 720p视频 60 帧/秒.............................................................................................27
4.2.4 YCbCr 5百万拍照 15帧/秒...........................................................................................28
4.3 驱动能力 .................................................................................................................................29
4.4 I/O 控制...................................................................................................................................29
4.5 MIPI 数据流控制 ....................................................................................................................30
4.5.1 MIPI 数据流开启 ............................................................................................................30 O
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OV5640 自动对焦成像模组应用指南
4.5.2 MIPI 数据流关闭 ............................................................................................................30
4.6 YUV 序列................................................................................................................................30
4.7 镜像和翻转 .............................................................................................................................31
4.8 测试图案 .................................................................................................................................32
4.9 移除灯光条纹 .........................................................................................................................33
4.10 用户界面功能 .......................................................................................................................34
4.10.1 亮度 亮度....................................................................................................................34
4.10.2对比度 ............................................................................................................................35
4.10.3色饱和度 ........................................................................................................................36
4.10.4 EV 曝光补偿 ................................................................................................................39
4.10.5 环境光模式 ....................................................................................................................40
4.10.6 特效................................................................................................................................41
4.10.7 夜景模式 ........................................................................................................................43
4.10.8 去除灯光条纹 ................................................................................................................43
4.11 自动对焦 ................................................................................................................................44
4.11.1 内置自动对焦 ...............................................................................................................44
4.11.2 I2C自动对焦命令 .........................................................................................................44
4.11.3 AF 自动对焦过程 ..........................................................................................................45
4.11.4 下载固件（ download firmware）...............................................................................45
4.11.5 自动对焦 .......................................................................................................................45
4.11.6 释放马达至初始状态 （对焦为无穷远处）.............................................................46
4.12 拍照流程 ...............................................................................................................................46
4.12.1 Shutter 快门时间 ..........................................................................................................46
4.12.2 Gain 增益......................................................................................................................46
4.12.3 虚拟曝光行（ Dummy Lines）及虚拟像素（ Dummy Pixels）.................................46
4.12.4 拍照流程 ........................................................................................................................46
4.12.4.1 自动对焦 ................................................................................................................46
4.12.4.2 Read Preview Registers..........................................................................................46
4.12.4.3 改变为拍照图像分辨率 ........................................................................................47
4.12.4.4 读取拍照设置参数 ................................................................................................47
4.12.4.5 转换预览增益和曝光值为拍照增益和曝光值 ....................................................47
4.12.4.6 增益值转换为曝光值，拍照参数下去除灯光条纹 ............................................47
4.12.4.7 写入增益（ gain）/曝光值（ shutter）.................................................................48
4.12.4.8 拍照........................................................................................................................48
4.12.4.9 返回预览模式 ........................................................................................................48
4.13 Scale and Zoom 缩放和变焦 ...............................................................................................48
4.13.1 Scale 缩放.....................................................................................................................48
4.13.2 Digital Zoom 数码变焦 .................................................................................................49
附录 I 双通道 MIPI 接口摄像头驱动程序 示例..............................................................................51
文档版本 历史....................................................................................................................................67