Image magnifying-processing circuit

Abstract

An image magnifying circuit comprises a frame memory (12) for storing input image data, a coefficient storage unit (18) in which in advance filter coefficients corresponding to a plurality of magnification ratios are stored, a non-linear magnification ratio control unit (20) for outputting an enable signal for reading the corresponding image data from the frame memory (12) and a coefficient selecting address AD3 for reading the corresponding filter coefficient from the coefficient storage unit (18), on the basis of a region width w predetermined to divide a display screen into n parts and the magnification ratios predetermined for the n regions, and a filter (14) for filtering the image data from the frame memory (12) on the basis of the filter coefficients from the coefficient storage unit (18) to output the image data on the image which is non-linearly magnified in a horizontal direction. These filter coefficients correspond to the magnification ratios which are set for the n regions of the display screen.

Description

technical field [0001] The present invention relates to a display panel that is used for a wide screen with an aspect ratio (Aspect Ratio) of 16:9 to enlarge and display a standard screen with an aspect ratio of 4:3. An image enlargement processing circuit that processes sampled input image data. Background technique [0002] The above-mentioned display panel includes, for example, a PDP (Plasma Display Panel). [0003] In recent years, the use of image display devices such as wide-screen televisions and PDPs with an aspect ratio of 16:9 has increased. In order to fully display (full mode display) an image source with an aspect ratio of 4:3 on an image display device with an aspect ratio of 16:9, it is necessary to set an image for expanding the original image source in the horizontal direction. Like the amplification processing circuit. [0004] Conventional image enlargement processing circuits expand and process input image data at a constant magnification in the horiz...

AI Technical Summary

Problems solved by technology

[0006] In addition, in the conventional example in which the input image data is expanded and processed so that the magnification increases toward both ends in the horizontal direction, the displayed image can only be enlarged and displayed in such a way that the magnification increases toward both ends in the horizontal direction. Therefore, each area after displaying the image in n equal divisions cannot be enlarged and displayed in the horizontal direction at any magnification, and there is a problem that various image effects cannot be exerted.

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