Image format converting method and apparatus
AssigneeSamsung Electronics Co., Ltd.
InventorYong-hun Cho
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Abstract
An image format converting method and apparatus are provided. The image format converter includes a pre-filter for pre-filtering the input image and for outputting a pre-filtered signal, and a format converter for bi-linear interpolating the pre-filtered signal, according to a predetermined aspect ratio, and for outputting a format converted signal. Therefore, the image format converter can have simple structure by adding the pre-filter, before the format converter using simple bi-linear interpolation, so that the image can be enlarged or reduced while remaining distinct and without aliasing.
Claims16
An image format converter for converting a resolution of an input image to enlarge or reduce the input image, the image format converter comprising:
- a variable effect pre-filter for pre-filtering the input image and for outputting a pre-filtered signal, said filter having selectable characteristics, said characteristics being defined by a parameter having one of a positive or negative sign that determines whether the filter is a high pass or low pass filter, and an absolute value that determines a degree of enlargement and reduction;
- and
- a format converter for bi-linear-interpolating the pre-filtered signal, according to a predetermined aspect ratio, and for outputting a format-converted signal;
- wherein filter characteristics of the pre-filter are selectable to compensate for operational effects of the format converter, wherein the operational effects comprise at least one of attenuation and aliasing caused by enlarging or reducing the input image.
An image format converting method for converting a resolution of an input image to enlarge and reduce the input image, the image format converting method comprising the steps of:
- (a) selectably setting filter characteristics of a pre-filter to compensate for operational effects of a format converter, wherein the operational effects comprise at least one of attenuation and aliasing caused by enlarging or reducing the input image, said selectably set characteristics being defined by a parameter having a positive or negative sign that determines whether the filter is a high pass or low pass filter and an absolute value that determines the degree of enlargement and reduction;
- (b) pre-filtering the input image based upon the selected filter characteristics to output a pre-filtered signal;
- and
- (c) bi-linear-interpolating the pre-filtered signal, according to a predetermined aspect ratio, to output a format-converted signal.
Dependencies are inferred from the claim text.