Patent ID: 8270740

Claim:
A frequency converter for inputting a frequency-unconverted image and outputting a frequency-converted image, said frequency converter comprising: an input image adjuster configured to input an input unit area of said frequency converter from outside said frequency converter; an overlap processor configured to perform overlap processing on said frequency-unconverted image at a boundary of a frequency converting unit area; and a frequency conversion section configured to perform frequency conversion on said frequency-unconverted image subjected to overlap processing, wherein: said input image adjuster includes: a processing area selecting element configured to select an overlap processing area from said input unit area, said overlap processor includes: an overlap element configured to perform overlap processing on said overlap processing area; and a holding element configured to hold image data of a remaining processing area which has been subjected to overlap processing but cannot be frequency-converted, and said remaining processing area includes: a linear area having a predetermined width, said linear area being frequency-converted when overlap processing is performed at a next or subsequent time, wherein: a maximum image area of said linear area includes: a first linear area whose horizontal width is a first predetermined width that is less than the horizontal width of said input unit area; and a second linear area whose vertical width is a second predetermined width that is less than the vertical width of said input unit area.