Image processing method, and image processor

An image processor for performing image processing to generate, from an input image, an output image having a higher resolution than a resolution of the input image, the image processor comprising:

• a training database in which pairs of training data items are stored, the pairs of training data items each including (i) a first training data item obtained from a high-frequency component of a training image and (ii) a second training data item obtained from at least a low-frequency component of the training image;
• a medium-frequency data generating unit configured to perform different processes on each of the second training data items stored in the training database, to generate third training data items each obtained through a corresponding one of the processes;
• a training data selecting unit configured to select, from among the third training data items generated from the second training data items by the medium-frequency data generating unit, a selection data item having a highest similarity to a feature data item indicating a feature of the input image;
• a high-frequency data generating unit configured to:
• determine (i) the second training data item used in generating the selection data item and (ii) a first process that is the processes performed on the second training data item to generate the selection data item;
• and perform the first process on the first training data item that is paired with the determined second training data item;
• and
• an adder which generates the output image by adding an image indicated by the high-frequency data item to the input image.