An image processing apparatus detects an amount of pixel motion in a plurality of field images included in interlace image data, and determines a pixel region having a large motion by comparing the amount of the motion of the detected pixel to a predetermined threshold value. The polymer according to the invention is produced by polymerisation from chain-forming hydrophilic vinyl ethers and crosslinking, preferably heterocyclic divinyl ethers. The wedge member drives the first and second base portions away from one another as the wedge member is moved in the loading direction.