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Cheap and rapid sensing system is required for detecting bad smell or VOC. Although a gas detector tube is known as simple gas detection method, its measurement process has not been automated. We studied an automated measurement system for gas detector tube using a built-in camera. Although the measurement was automated using our system, other problem was disclosed. Since a digital camera is sensitive to color change, the slight change due to humidity, which is not the problem for manual inspection, cannot be ignored in our system. Thus, the humidity sensor was added to the system. However, the simple compensation method such as linear regression etc did not work because the humidity influenced the data in a complicated manner. Then, MLP (multilayer perceptron) neural network was used for the humidity compensation. Both discoloration area and the humidity data were input to the neural network. As a result, the accurate concentration estimation was successfully performed.