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Enhancement of blurred image portions

A technology for blurring images and image enhancement, applied in image enhancement, image analysis, image data processing, etc., can solve problems such as poor lighting conditions, artistic intentional generation, etc., to achieve the effect of reducing computational complexity

Inactive Publication Date: 2007-10-03
KONINKLIJKE PHILIPS ELECTRONICS NV
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  • Abstract
  • Description
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  • Application Information

AI Technical Summary

Problems solved by technology

[0006] Limited depth of focus can also occur due to poor lighting conditions, or can be intentionally produced for artistic reasons

Method used

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  • Enhancement of blurred image portions
  • Enhancement of blurred image portions
  • Enhancement of blurred image portions

Examples

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Embodiment Construction

[0051]The present invention proposes a simple and highly computationally efficient technique to enhance the blurred image parts of the input image, where such enhancement may involve, for example, enhancement of the sharpness of these blurred image parts. To this end, the blurred image portion and the non-blurred image portion in the input image are first distinguished, and then at least one of the blurred image portions is enhanced.

[0052] Fig. 1 schematically depicts a first embodiment of an apparatus 10 for image enhancement according to the present invention. In this embodiment, the distinction between the blurred image portion and the non-blurred image portion is based on the observation that linear and non-linear magnification of the reduced version of the input image obtains different results for the blurred image portion and the non-blurred image portion, thereby Based on the comparison of the difference between the two enlarged images and the (original) input image, it ...

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Abstract

This invention relates to a method for image enhancement, comprising a first step (41) of distinguishing blurred and non-blurred image portions of an input image, and a second step (42) of enhancing at least one of said blurred image portions of said input image to produce an output image. Said blurred and non-blurred image portions are for instance distinguished by comparing (416) the differences (415) between a linearly up-scaled (414) version of the down-scaled (411) input image and the input image, and the differences (413) between a non-linearly up-scaled (412) representation of the down-scaled input image and the input image. Said blurred image portion is for instance enhanced by replacing (42) it with a portion of a non-linearly up-scaled representation of the down-scaled input image. The invention also relates to a device, a computer program, and a computer program product.

Description

Technical field [0001] The present invention relates to a method, computer program, computer program product and equipment for image enhancement. Background technique [0002] For example, images such as single-lens portraits or subsequent images of movies are generated to record or display useful information, but the processing of image formation and recording is not perfect. The recorded image always represents a reduced quality version of the original scene. Three main types of quality degradation can occur: blur, point-by-point nonlinearity, and noise. [0003] Blur is a form of image bandwidth reduction caused by image formation processing. It may be caused by the relative movement between the camera and the original scene, or it may be caused by an out-of-focus optical system. [0004] For example, when a camera images a three-dimensional scene onto a two-dimensional image field and some parts of the scene are in focus (clear) and other parts are out of focus (unclear or bl...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06T5/00
CPCG06T2207/20012G06T5/003G06T5/73
Inventor G·德哈安
Owner KONINKLIJKE PHILIPS ELECTRONICS NV
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