1. An image acquisition method, the method comprising: receiving an input gesture performed on an image captured by a camera; determining a filter operation from a plurality of filter operations corresponding to a current filter type, where the determination is according to a pre-stored relation which associates the filter operation with the filter type and the type of the gesture; determining a filter parameter of the filter operation according to the current filter type and a scale value of the gesture; performing the filter operation on the image according to the filter parameter; and displaying the image processed through the filter operation in real time.