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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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Based on the theory of colorimetry , the technology for simulating colors having desired CIE chromaticity coordinates and luminances on general TVGA CRT monitors is discussed. On white-balance adjustment and calibration of the color monitor, the relation between the RGB phosphors is studied, thus a model with piecewise linear programming and progressively addition approaching algorithm is setup. Having obtained the spectral reflectance of the sample color to be simulated by an interfance with a color...

Based on the theory of colorimetry , the technology for simulating colors having desired CIE chromaticity coordinates and luminances on general TVGA CRT monitors is discussed. On white-balance adjustment and calibration of the color monitor, the relation between the RGB phosphors is studied, thus a model with piecewise linear programming and progressively addition approaching algorithm is setup. Having obtained the spectral reflectance of the sample color to be simulated by an interfance with a color measurement system9 the frame buffer of the monitor is directly programmed and the digital input values to it is corrected by iteration such that a vivid color is displayed on the CRT color monitor.

根据色度学的原理,探讨在常规的TVGA彩色显示器上模拟具有要求的CIE色品坐标和亮度值的颜色的技术。在对彩显进行白平衡调整和荧光粉色度特性定标的基础上,考虑了三原色荧光粉之间的相关性,提出了一种分段线性回归并逐次叠加逼近的算法。利用与测色系统的通信接口获得实测样品色的光谱反射比数据,经数据分析和处理,直接对显示器颜色缓冲器进行底层编程和迭代修正,在CRT上得到了逼真的颜色。

A new algorithm for automatic white balance is presented. Without any reference object, white balance can be performed automatically on a digital image which contains a human face, based on the observation that the value of UV components in a human face are concentrated in a small area. Simulation results show its good performance.

本文提出了一种基于先验知识的自动白平衡方法。在对包含人脸的数字图像进行白平衡处理时,依据人脸肤色的色差分量集中在一个比较小的区间这一实验结果,不需要白色参照物,自动完成白平衡。模拟结果表明本文提出的白平衡算法取得了较好的效果。

Virtual instrument is the advanced technique in measurement field.It has typical development steps based on the hardware,software,bus structure etc. In this article,we introduce the design of color TV white balance test system based on virtual instrument technique,especially discuss the construct of hardware and software architecture based on VC++.

虚拟仪器是当今仪器仪表发展的趋势 ,根据硬件结构、总线结构、开发平台的不同 ,虚拟仪器系统有一套典型开发步骤和系统构建方式。介绍了基于虚拟仪器技术的彩电白平衡测试系统的设计 ,给出了它的硬件构成原理 ,用 VC+ + 作为软件开发平台的设计方法及此系统的特点。

 
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