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。 Based on the analysis of Chinese characters’ usage frequency and its spatial spectrum, a Chinese target for digital camera image quality evaluation was designed. Through the statistical analysis of the spatial frequency response (SFR), subjective quality factor (SQF) and Chinese target test results of 37 digital camera models, the empirical formula between the smallest identifiable Chinese pound value and SFR and SQF . In addition, 10 digital cameras were selected for verification. The results showed that the SFR and SQF values ​​obtained by the modulation transfer function test method all fell within 95% confidence intervals of SFR and SQF. This kind of Chinese character plate test method is similar to the way of interpreting eye chart, simplifying the test equipment, the operation method is also simple.