光学学报, 2013, 33 (1): 0112003, 网络出版: 2012-11-06
基于汉字靶板的数码相机像质评测方法
Evaluation Method of Digital Camera Image Quality Based on Chinese Characters Testing Chart
测量 汉字靶板 空间频率响应 主观质量因子 像质评价 measurement Chinese characters testing chart subjective quality factor (SQF) spatial frequency response (SFR) image-quality evaluation
摘要
基于对汉字使用频率及其空间频谱的分析，设计了一种数码相机像质评测用的汉字靶板。通过对37台不同型号数码相机的空间频率响应(SFR)、主观质量因子(SQF)及汉字靶板测试结果的统计分析，获得了最小可识别汉字磅值分别与SFR、SQF之间的经验公式。另抽取10台数码相机验证，结果显示调制传递函数测试法获得的SFR、SQF值均落在汉字靶板测试法获得SFR、SQF的95%的置信区间内。这种汉字靶板测试法类似于判读视力表的方式，简化了测试设备，操作方法也简单。
Abstract
Based on the use frequency of Chinese characters and its space frequency spectrum analysis, a Chinese characters testing chart is designed for digital camera image-quality evaluation. Under statistical analysis of test results of spatial frequency response (SFR), subjective quality factor (SQF) and the Chinese characters testing chart for 37 different models of digital cameras, the empirical formulas between the just recognizable Chinese characters point size and SFR/SQF are obtained. Verification tests of 10 other digital cameras show that measured SFR/SQF values fall in 95% confidence interval. The Chinese characters testing chart is similar to visual testing chart. This evaluation method has some advantages compared to other methods, such as convenient operation, simplified equipment.
李振杰, 周桃庚, 朱泰然, 刘琳, 李桂萍, 沙定国. 基于汉字靶板的数码相机像质评测方法[J]. 光学学报, 2013, 33(1): 0112003. Li Zhenjie, Zhou Taogeng, Zhu Tairan, Liu lin, Li Guiping, Sha Dingguo. Evaluation Method of Digital Camera Image Quality Based on Chinese Characters Testing Chart[J]. Acta Optica Sinica, 2013, 33(1): 0112003.
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