基于嵌入式系统的图像自动降色去噪方法及实现-信号与信息处理专业论文.docx

上海交通大学硕士学位论文 上海交通大学硕士学位论文 vi vi Method and Implement of Automatic Color and Noise Reduction Based on Embedded System ABSTRACT The method studied in this article treat noise differently on condition that the illuminance changes and with the knowledge of structure of human eyes. This thesis firstly introduces the physical structure of human eyes. Then it introduce the structure of the sensor of the mobile phone camera. Compare the difference between human eyes and sensor. Secondly the system solution, control interface, data interface and data timing is explained. Then schematic diagram and the picture of the main board. In the chapter of algorithm, the color pipeline is first introduced, then we discuss how to realize the algorithm and the function and flow chart, and decide the parametric of function. In the last chapter, we show the testing environment, testing tools, testing object and testing software. In three illuminations, which is also the extent of the function, picture is taken, tested and analyzed. At last, we evaluate the merit and effect. This thesis proposes an method to reduce noise of digital camera in low light illuminance, The method connect the noise reduction and noise level together with the phenomenon of physiological structure of human eyes. KEY WORDS： Auto Color; Embedded System, Noise Reduction; LowLight xi xi 图索引 图 2-1视觉通道…………………………………………………………….5 图 2-2人类右眼水平剖视图………………………………………………….5 图 2-3 光谱相对亮度与普尔基涅现象………………………………………9 图 2-4 CMOS Senosr 照片………………………………………….……….10 图 2-5 CMOS Sensor 结构图………………………………………………...10 图 2-6 RGB 原色滤镜矩阵……………………………………………….…11 图 2-7 原色滤镜 侧视结构图…………………………………………….…12 图 2-8 色彩插补算法………………………………………………………...13 图 3-1 Qualcomm 7225 模块功能图…………………………………..…….14 图 3-2 OV5642 模块功能图…………………………………………………18 图 3-3 拍照系统架构及模块图………………………………………..….…19 图 3-4 I2C 开始结束时序…………………………………………….……...20 图 3-5 I2C 单字节读时序………………………………………………….…21 图 3-6 I2C 多字节读时序……………………………………………………..21 图 3-7 I2C 写时序…………………………………………………………….22 图 3-8 I2C 多字节写时序…………………………………………