An image processing apparatus is provided, the image processing apparatus including a memory storing one or more instructions, and a processor configured to execute the one or more instructions stored in the memory to obtain similarity information, based on a difference between each of pixels included in a first image and an adjacent pixel of each of the pixels, based on the similarity information, determine weight information, obtain first feature information through a convolution operation between the first image and a first kernel, obtain second feature information by applying the weight information to the first feature information, and based on the second feature information, generate a second image.