To improve the accuracy of temperature measurement using a CCD camera

the common used method is to build a filtering system in optical path. The method

however

is unsuitable for real industrial measurement because of the complexity of building and adjusting the filtering device

and meanwhile

image matching needs to be considered for obtaining accurate grayscale ratio.To be convenient for industrial temperature measurement

a digital filtering method is proposed based on an algorithm of CCD spectral response curve tracing.The method is compared with conventional method of loading filtering devices.The result indicates that the digital filtering is more convenient for temperature field measurement and keeps a satisfactory accuracy.