Method and device for generating up-sampling filter

Provided is a method for generating an up-sampling filter, which can improve the effect of image processing. The method comprises: acquiring an original enhancement layer sample image and a down-sampling filter; generating a base layer sample image according to the original enhancement layer sample image and the down-sampling filter; and generating an up-sampling filter according to the base layer sample image and the original enhancement layer sample image, so that the up-sampling filter satisfies that: the similarity between sample prediction information which is generated according to the up-sampling processing performed on the base layer sample image by the up-sampling filter and original information which is determined according to the original enhancement layer sample image satisfies preset conditions. The similarity of a prediction image which is generated according to a base layer image and a determined up-sampling filter to an original image of an enhancement layer image can be effectively improved, which reduces the impact on image processing when the pixels of the base layer image have, for example, a sudden change, and improves the effect of image processing.