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首页> 外文会议>Image Quality and System Performance IV; Proceedings of SPIE-The International Society for Optical Engineering; vol.6494; Electronic Imaging Science and Technology >Accurate and Cost-Effective MTF Measurement System for Lens Modules of Digital Cameras
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Accurate and Cost-Effective MTF Measurement System for Lens Modules of Digital Cameras

机译：用于数码相机镜头模块的精确且经济高效的MTF测量系统

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摘要

For many years, the widening use of digital imaging products, e.g., digital cameras, has given rise to much attention in the market of consumer electronics. However, it is important to measure and enhance the imaging performance of the digital ones, compared to that of conventional cameras (with photographic films). For example, the effect of diffraction arising from the miniaturization of the optical modules tends to decrease the image resolution. As a figure of merit, modulation transfer function (MTF) has been broadly employed to estimate the image quality. Therefore, the objective of this paper is to design and implement an accurate and cost-effective MTF measurement system for the digital camera. Once the MTF of the sensor array is provided, that of the optical module can be then obtained. In this approach, a spatial light modulator (SLM) is employed to modulate the spatial frequency of light emitted from the light-source. The modulated light going through the camera under test is consecutively detected by the sensors. The corresponding images formed from the camera are acquired by a computer and then, they are processed by an algorithm for computing the MTF. Finally, through the investigation on the measurement accuracy from various methods, such as from bar-target and spread-function methods, it appears that our approach gives quite satisfactory results.
机译：多年来，数字成像产品（例如，数码相机）的广泛使用引起了消费电子市场的广泛关注。但是，与传统相机（带有胶卷）相比，测量和增强数字相机的成像性能非常重要。例如，由光学模块的小型化引起的衍射效应趋于降低图像分辨率。作为品质因数，已广泛采用调制传递函数（MTF）来估计图像质量。因此，本文的目的是为数字相机设计和实现一种精确且经济高效的MTF测量系统。一旦提供了传感器阵列的MTF，即可获得光学模块的MTF。在这种方法中，采用空间光调制器（SLM）来调制从光源发出的光的空间频率。传感器连续检测通过被测摄像机的调制光。由照相机形成的对应图像由计算机获取，然后由用于计算MTF的算法进行处理。最后，通过对各种方法（如条形目标法和扩展函数法）的测量精度进行调查，看来我们的方法给出了令人满意的结果。

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