In certain applications, native surface patterns can be used in place of speckle patterns in digital image correlation (DIC). This paper explores the feasibility of using text as a native speckle pattern in DIC. Five text speckle patterns are tested in three different scenarios: a rigid body translation test, a rigid body rotation test, and an out of plane bending test. The patterns are benchmarked against a sixth, random speckle pattern applied using traditional DIC speckling methods. Rigid body translation tests are additionally performed on text patterns with varying font types and line spacings. In general, text patterns have good contrast, but low density as line spacing increases. Measurement uncertainty for the text patterns was comparable to measurement uncertainty in the random speckle pattern. Results from these tests show that while text patterns cannot be expected to perform better than a traditional DIC speckle pattern, text patterns can be effective speckle patterns in situations where already present on a specimen and applying a traditional speckle pattern is difficult.

在某些应用中，原生表面图案可用于代替数字图像相关 (DIC) 中的散斑图案。本文探讨了在 DIC 中使用文本作为原生散斑图案的可行性。在三种不同的场景中测试了五种文本散斑图案：刚体平移测试、刚体旋转测试和平面外弯曲测试。这些图案以使用传统 DIC 散斑方法应用的第六个随机散斑图案为基准。此外，还对具有不同字体类型和行距的文本模式执行了刚体翻译测试。一般而言，文本图案具有良好的对比度，但随着行距的增加密度较低。文本图案的测量不确定度与随机散斑图案的测量不确定度相当。