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Color constancy method and system

A color constant and algorithmic technology, applied in image enhancement, image analysis, instrumentation, etc., can solve the problem of performance affecting the overall image quality of the camera

Inactive Publication Date: 2011-07-27
HEWLETT PACKARD DEV CO LP
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  • Abstract
  • Description
  • Claims
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Problems solved by technology

However, the performance of these algorithms affects the overall image quality of the camera

Method used

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  • Color constancy method and system
  • Color constancy method and system

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Embodiment Construction

[0014] In the following detailed description, reference is made to the accompanying drawings, which form a part hereof, and in which are shown by way of illustrations specific embodiments in which the invention may be practiced. In this regard, directional terms such as "top", "bottom", "front", "rear", "front", "rear", etc. are used with reference to the orientation of the figures being described. Since components of embodiments of the present invention may be positioned in several different orientations, the directional terminology is used for purposes of illustration and is in no way limiting. It is to be understood that other embodiments may be utilized and structural or logical changes may be made without departing from the scope of the present invention. Accordingly, the following detailed description should not be taken in a limiting sense, and the scope of the invention is defined by the appended claims.

[0015] figure 1 is a block diagram conceptually illustrating ...

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Abstract

A color constancy method and system include dividing an image into a plurality of sub-images and applying a plurality of color constancy algorithms to each of the sub-images. The outputs of each of the color constancy algorithms are analyzed for each of the sub-images to determine which of the color constancy algorithms give inconsistent results across the sub-images. The influence of the outputs of the algorithms providing inconsistent results is adjusted to decrease their influence (e.g. effect or weight) with respect to the outputs of algorithms providing consistent results. The outputs from the plurality of color constancy algorithms are combined based upon the adjustment of the outputs.

Description

Background technique [0001] Human observers see the same range of colors under a wide variety of scene lighting sources; a piece of white paper remains resolutely white regardless of the color of the light under which it is viewed. In contrast, color imaging systems such as digital cameras are not so color constant. [0002] The problem of color constancy - determining the color of the light illuminating the scene and correcting the image to account for its effects - is problematic for many imaging applications. In particular, digital cameras rely on color constancy algorithms to detect illumination sources and produce the final image. The performance of these color constancy algorithms directly affects the overall image quality of the camera, and the human eye is sensitive to such imperfections. [0003] Known color constancy algorithms vary in effectiveness. None of the known algorithms give perfect results, and no one algorithm is better than the other in terms of accura...

Claims

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Application Information

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IPC IPC(8): G06T1/00
CPCG06T5/001G06T2207/20021H04N1/6077H04N1/6086G06T2207/10024
Inventor R·吴Y-W·王
Owner HEWLETT PACKARD DEV CO LP
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