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

a technology of color image and computer readable medium, applied in the field of method, computer readable medium and apparatus for converting color image resolution, can solve the problems of insufficient resolution of devices, relatively short execution time of image conversion, etc., and achieve the effects of reducing jaggedness, high resolution, and low resolution

Inactive Publication Date: 2005-01-13
SUZUKI HIROAKI +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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.

Method used

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

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Embodiment Construction

Referring now to the drawings, wherein like reference numerals designate identical or corresponding parts throughout the several views, and more particularly to FIG. 1 thereof, is shown as an exemplary color image resolution converting method according to the present invention. The present exemplary method converts image resolution for various types of images, such as plain single color images (e.g., a background of text strings), full color images (e.g., photographs), binary text strings and drawings, anti-alias processed text strings and drawings, text strings and drawings having shadows, continuous toned text strings, continuous toned graphic images, half toned graphic images, etc.

In the present invention, the term image enlargement refers to multiplying or increasing the number of pixels in an input image, and thereby generating an image having a larger number of pixels. A term enlarging ratio (ER) or image enlarging ratio refers to a ratio of the number of pixels of a genera...

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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...

Claims

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Application Information

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Patent Type & Authority Applications(United States)
IPC IPC(8): G06K9/00G06K9/32G06K15/02G06T3/40H04N1/393H04N1/40H04N1/56H04N1/60
CPCG06T3/4015G09G5/02H04N1/58H04N1/3935H04N1/40068G09G2340/0407
Inventor SUZUKI, HIROAKIKOMATSU, MANABU
Owner SUZUKI HIROAKI
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