Fujitsu General Limited

Hideyuki Ohmori

Toru Aida

Masayuki Kobayashi

Junichi Onodera

Masamichi Nakajima

An image magnifying circuit is made up of a frame memoryfor storing input image data, a coefficient memoryin which filter coefficients corresponding to a plurality of magnification ratios are stored, a non-linear magnification controllerfor outputting an enable signal for reading the corresponding image data from the frame memoryand a coefficient selecting address ADfor reading the corresponding filter coefficient from the coefficient memory, on the basis of an area width w predetermined to divide a display screen into n parts and a predetermined magnification for the n parts, and a filterfor filtering the image data from the frame memoryon the basis of the filter coefficients from the coefficient memoryto output the image data on the image which is non-linearly magnified in a horizontal direction. These filter coefficients correspond to the magnification ratio which are set for the n parts of the display screen.

Image magnifying circuit

An image processor containing an EPROM ( ) stored with coefficient data for image enlargement and reduction, coefficient read controllers ( ) for reading out coefficient data from the EPROM ( ) according to an enlargement/reduction selection signal, a variable horizontal characteristic filter ( ) for executing either image enlargement or image reduction according to the coefficient data, a variable vertical characteristic filter ( ) also for executing either image enlargement or image reduction according to the coefficient data, a frame memory ( ), a contour correcting circuit ( ), and selectors ( ). When image enlargement is selected by selectors ( ), input video signals are processed by the contour correcting circuit ( ), the frame memory ( ), and the filters ( ) in this order while, when image reduction is selected, input video signals are processed by the same in the reverse order. The portion which should not undergo contour enhancement does not undergo contour enhancement during image enlargement, and high frequency components enhanced by contour correction during image reduction do not disappear and adequate contour correction, even when either processing image enlargement or reduction, is selected.

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Kanagawa-ken, Japan

Hideyuki Ohmori