开展了不同外界环境条件下红外热像法检测建筑外墙饰面层粘结缺陷的试验，分析了天气状况、检测时段、室外温度等对检测结果的影响，对现行技术规程中红外热像法检测建筑外墙饰面层粘结缺陷的适宜条件进行了改进;结果表明，阴天以及室外温度低于10℃时，红外热像检测易遗漏小尺寸的粘结缺陷。建立了基于图像处理的外墙饰面层粘结缺陷面积评定方法，该方法可有效、定量地提取估算外墙饰面层空鼓区域的面积；基于该方法的图像处理分析结果表明，室外温度越高、空鼓面积越大、空鼓深度位置越浅，红外热像法的检测效果越好,而空鼓厚度对检测效果影响不明显。

Infrared thermography method was used to inspect the defects of exterior walls cement coating under different environmental conditions. The effects of weather conditions, test time in a day and outdoor temperatures on the test results were analyzed, and the suitable conditions in the current technical specifications for defects inspection of exterior walls cement coating using infrared thermography method were modified. The experimental results showed that, the defects of small size were easily to be omitted by mistake in a cloudy day or when the outdoor temperature was lower than 10℃. The method for evaluating the area of bonding defects was proposed based on the image processing of infrared thermography method. The proposed method was effective and quantitative for extracting the area of exfoliation of cement coating. The image processing analysis results showed that, the inspecting result of infrared thermography method was better when at higher outdoor temperature, with larger area and more shallow depth of exfoliation of cement coating. The effect of the thickness of exfoliation of cement coating was not obvious on the inspecting result of infrared thermography method.