It is found that the displacements can reach several 10 pixels, but most of them are rigid displacements and the deformational displacements are not over several pixels.

• 本文研究了散斑图像中所包含的位移信息后,发现一般情况下,表征被测物体表面变形的位移只有几个像素,而刚体位移却比变形位移大的多。