Apparatus and method for computing dynamic variation of target object

An apparatus for calculating a dynamic variation of a target object comprises: an enhancement processing unit for adjusting the brightness of a pixel determined as displaying a particle dispersed to a target object in at least two images generated for the target object at different times; and a calculation unit for calculating the dynamic variation of the target object based on the correlation between the different images processed by the enhancement processing unit. The enhancement processing unit sets the brightness of the pixel having a brightness that is higher than a threshold value as a reference brightness which is larger than the threshold value for each image. [Reference numerals] (110) Output unit; (120) Image receiving unit; (130) Image processing unit; (140) Enhancement processing unit; (150) Calculation unit; (160) Information providing unit; (20) Target object