To provide techniques for appropriately improving a resolution of an image signal.
A video signal including an image signal whose pixel size is converted at a specified magnification is inputted. The input image signal is used to calculate sampling frequencies for image signals before and after the pixel size conversion. A ratio of sampling frequencies before and after the pixel size conversion is used to determine the specified magnification. A sampling phase for the image signal before the pixel size conversion is calculated from the input image signal after the pixel size conversion. A sampling carrier for the image signal before the pixel size conversion is generated from both the sampling frequency and the sampling phase before the pixel size conversion. The specified magnification is used to generate an initial component signal obtained by removing or decreasing a folded-back component from the input video signal. A high-frequency component signal is generated from the folded-back component contained in the video signal and the sampling carrier before the pixel size conversion. A high-resolution image signal is generated from the initial component signal and the high-frequency component signal.
HAMADA KOICHI
YONESHI KENICHI
Yuji Toda
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