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| Method and apparatus for automatic shape recognition |
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| Method of identifying objects |
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| Method and apparatus for recognizing characters on a document |
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| Computer-based system and method for character recognition |
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| Method and apparatus for compressing and decompressing images of documents |
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| Particulate magnetic medium utilizing keeper technology and methods of manufacture |
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| Recording apparatus |
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Image processing method and apparatus
| Details |
Inventors: Saotome, Shigeru; Ogawa, Eiji;
Assignee: Fuji Photo Film Co., Ltd. (Kanagawa-ken, JP)
Primary Examiner: Lee; Thomas D.
Assistant Examiner:
Attorney, Agent or Firm: Sughrue, Mion, Zinn, Macpeak & Seas, PLLC
A digital image signal, which represents values of picture elements arrayed along X and Y directions of an image, is subjected to operation processing carried out with the formula Q'=Qorg+.beta.(Qorg-Qus), wherein Qorg represents the original image signal representing each picture element, Qus represents an unsharp mask signal corresponding to super-low frequency with respect to the picture element, and .beta. represents an emphasis coefficient. The image signal obtained from the operation processing is fed into a reproducing apparatus, which reproduces an image by operations for scanning along X and Y directions. The operation processing is carried out with respect to the X and Y directions, under characteristics varying for different directions, and in accordance with a difference between responses of the reproducing apparatus along the X and Y directions. Final levels of sharpness of a visible image, which is reproduced by the reproducing apparatus, along the X and Y directions are thereby adjusted to be approximately equal to each other. |
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DETAILED DESCRIPTION The primary object of the present invention is to provide an image processing method, wherein frequency emphasis processing is carried out, and the levels of sharpness of a reproduced visible image along X and Y directions are adjusted to be approximately equal to each other.
Another object of the present invention is to provide an image processing method, wherein frequency emphasis processing is carried out, and an artifact is prevented from occurring in a reproduced visible image due to excessive frequency emphasis.
The specific object of the present invention is to provide an apparatus for carrying out the image processing method.
The present invention provides a first image processing method, comprising the steps of: i) subjecting a digital image signal, which represents picture element values of picture elements arrayed along X and Y directions of an image, to operation processing carried out with the formula Q'=Qorg+.
beta.
(Qorg-Qus) (1) wherein Qorg represents the original image signal representing each picture element, Qus represents an unsharp mask signal corresponding to super-low frequency with respect to the picture element, and .
beta.
represents an emphasis coefficient, and ii) feeding the image signal, which has been obtained from the operation processing, into an image reproducing apparatus, which is constituted to reproduce an image by operations for scanning along X and Y directions, wherein the operation processing is carried out with respect to the X and Y directions, under characteristics varying for different directions, and in accordance with a difference between responses of the image reproducing apparatus along the X and Y directions, whereby final levels of sharpness of a visible image, which is reproduced by the image reproducing apparatus, along the X and Y directions are adjusted to be approximately equal to each other.
Specifically, in the first image processing method in accordance with the present invention, in order for the operation processing to be carried out with respect to the X and Y directions and under characteristics varying for different directions, the operation processing may be firstly carried out with respect to one of the X and Y directions by setting the emphasis coefficient to be equal to
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Image Analysis 
