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white balance
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  white balance
We exploit the known flash color to white-balance the ambient image, rather than relying on traditional single-image heuristics.
      
We see that using automatic gain and white balance controls performs the worst.
      
With use of a white cali bration target white balance is performed auto matically or manually.
      
Under most circumstances, automatic white balance should give you acceptable images.
      
The scaling is used to white balance the image because silicon photodiodes are more sensitive to red light than to blue.
      
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eBoat400Digital Still Camera is developed with NW820as data processing and control in the study.The flow chart of research and design for eBoat400B is introduced.The key technology and image processing theory and algo-rithms ,including RGB data Interpolation algorithm,white balance processing,color space transformation and sampling,auto exposure control,is been studied in the paper.

该项研究以Divio公司的NW820为数据处理及主控芯片,开发完成了eBoat400数码相机。文章介绍了eBoat400数码相机软硬件开发流程及数码相机基本数字图象处理理论与算法,内容涉及RGB彩色阵列插补、白平衡处理、彩色空间转换和亚采样模块、自动曝光控制等。

The elements, system and data flow of Digital Still Camera (DSC) are described and analyzed. Typical DSC system has the modules of lens, flash lamp, viewfinder, LCD screen, UIO expansion controller for image storage, UIO expansion controller for data exchange, power supply, microprocessor and others. DSC's data flow starts from the image sensor and stops at the image data storage. DSC data processing module includes analog-digital converter, optical black level clamp, lens distortion compensation, dead pixel...

The elements, system and data flow of Digital Still Camera (DSC) are described and analyzed. Typical DSC system has the modules of lens, flash lamp, viewfinder, LCD screen, UIO expansion controller for image storage, UIO expansion controller for data exchange, power supply, microprocessor and others. DSC's data flow starts from the image sensor and stops at the image data storage. DSC data processing module includes analog-digital converter, optical black level clamp, lens distortion compensation, dead pixel correction, white balance management, gamma correction, color composing, edge detection and false color suppression, JPEG compression, image data storage and others.

介绍了数码相机的工作原理 ,分析了数码相机的系统结构 ,提出了设计数码相机的处理流程。典型的数码相机系统有镜头、闪光灯、光学取景器、LCD显示屏、图像数据存储扩展设备接口、图像数据传输接口、供电系统以及核心处理器等八个主要模块。数码相机的数据流向从图像传感器开始 ,止于图像数据的存储和传输。数据流的处理主要包括模数转换、光学黑电平钳位、针对镜头的边缘畸变的运算修正、坏像素处理、白平衡处理、伽马校正、色彩合成处理、边缘检测 (锐度检测 )和伪彩色检测 (伪彩色抑制 )、JPEG压缩和图像存储器等模块

Color control,exposure control and definition control are the three important control technologies in digital image capturing. The main features of the color control process contain a series of different special terms:the control of color reproduction details and gradation by appropriate setting the number of color digits, the control of color hue through the adjustment of white balance,the control of color performance assortment and range by the help of color space system,the use of different color modes...

Color control,exposure control and definition control are the three important control technologies in digital image capturing. The main features of the color control process contain a series of different special terms:the control of color reproduction details and gradation by appropriate setting the number of color digits, the control of color hue through the adjustment of white balance,the control of color performance assortment and range by the help of color space system,the use of different color modes to yield specific color tone to satisfy the needs of different funs and applications etc.

色彩控制是数字影像获取中与曝光控制、清晰度控制并列的三大控制技术之一,它必须通过色彩位数选择控制色彩表现细节,借助于白平衡调整控制色别的准确再现,依托色彩空间的不同控制颜色表现的种类与范围,利用不同的色彩模式使色彩适应不同人的喜好与不同的应用。

 
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