Method, computer readable medium and apparatus for converting color image resolution

Abstract

A method, computer readable medium and apparatus for converting color image resolution including inputting an image enlarging ratio, inputting target pixel data of an image in a first color space to be enlarged in a sequence, sampling reference pixels including the target pixel and pixels at least one of which links to the target pixel, and converting the reference pixel data into a second color space data. Other functions include extracting image feature quantities from the reference pixel data, selecting one of a plurality of pixel multiplying methods according to the extracted image feature quantities, multiplying the target pixel by the selected image multiplying method with an integer value based on the input image enlarging ratio, and outputting pixel data that have been generated by the target pixel multiplying step in a sequence.

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method, computer readable medium and apparatus for converting color image resolution, and more particularly relates to a method, computer readable medium and apparatus for converting a relatively low resolution color image having bi-level and multi-level pixel values into a relatively high resolution color image. 2. Discussion of the Background In general, a digital image displayed on a monitor screen, such as an image of an Internet web page, has relatively low image resolution, for example, 72 dots per inch (dpi). On the other hand, recent color image printers can print images with a relatively high image resolution, such as 400 dpi, 600 dpi, 1200 dpi, etc., as compared to the above-noted digital image displayed on the monitor screen. In other words, a printed image can have more picture elements (pixels) per unit area than an image displayed on a monitor screen. Therefore, when image data...

AI Technical Summary

Benefits of technology

Accordingly, an object of the present invention is to provide a novel method, computer readable medium and apparatus for converting a relatively low resolution image into a relatively high resolution image, while reducing jaggedness at an image boundary including a continuous toned color image.

Another object of the present invention is to provide a novel method, computer readable medium and apparatus for converting a relatively low resolution image into a relatively high resolution image with a relatively short image conversion time.

Another object of the present invention is to provide a novel method, computer readable medium and apparatus for converting a relatively low resolution image into a relatively high resolution image, while reducing improper coloring and blurring at an image boundary.

Problems solved by technology

However, the discloses methods and devices do not adequately address converting an image resolution of an image comprising various types of image categories, while reducing jagged images, improper coloring, blurring and doing so with a relatively short execution time for the image conversion.

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