The performances of colour-difference formulae were investigated for predicting very large colour difference based on visual evaluation of object surface colours.
基于物体表面色样本的视觉评价，测试了典型色差公式对超大色差的预测性能。
The performances of modern colour-difference formulae were investigated to evaluate very small colour difference at human eyes threshold level based on object surface colours.
基于物体表面色样本的视觉评价，测试常用色差公式在人眼阈值水平的微小色差预测性能。
Based on single channel double colour principle, it overcomes the interference of emissivity of object surface and other factors on temperature measuring precision.
用单通道实现比色成像，可明显地降低物体表面发射率及其它因素对测温精度的影响。
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