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Method and system in a digital image processing chain for adjusting a colour balance, corresponding equipment, and software means for implementing the method

A digital image and color balance technology, applied in image data processing, image enhancement, image analysis, etc., can solve problems such as failure, and achieve the effect of reducing unnecessary signals

Inactive Publication Date: 2008-09-24
NOKIA CORP
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Since this condition is not satisfied, for example in the case of natural images, these methods also often fail
[0032] Issues are also known to occur in functions that are very much related in nature to the success of color balance adjustments or at least in their compatibility with

Method used

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  • Method and system in a digital image processing chain for adjusting a colour balance, corresponding equipment, and software means for implementing the method
  • Method and system in a digital image processing chain for adjusting a colour balance, corresponding equipment, and software means for implementing the method
  • Method and system in a digital image processing chain for adjusting a colour balance, corresponding equipment, and software means for implementing the method

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Embodiment Construction

[0056] The schematic diagram of Figure 1 illustrates an example of a digital image processing chain 10 according to the invention. Such image processing chains 10 can be provided, for example, in digital camera devices or generally in devices equipped with camera sensors, which are now even found, for example, in mobile stations. The color balance correction method according to the invention is well suited to a large number of different camera-specific imaging chains, the implementation of which can naturally differ from that shown in FIG. 1 . In addition, the chain 10 is naturally also suitable for post-processing, for example implemented with software components (for example in combination with image processing software).

[0057] The cooperation between the color balance adjustment method and the other functions provided in the image processing chain 10 can also be implemented effectively with considerable ease. In this case, the method according to the invention is repres...

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Abstract

The invention relates to a method in a digital image processing chain (10) for adjusting a colour balance. In the method, the subject is imaged as colour components (R, G, B), from which cumulative histograms are formed. From these colour curves, the illumination colour (Rill, Gill, Bill) is defined in a selected manner, which is taken into account when defining the gain factor (GR, GG, GB) adjusting the colour balance. In the method, before the illumination colour is defined, at least such pixel values (G(S)) as meet a selected criterion are filtered out. After this, cumulative histograms are formed, and, using a selected criterion, a point hi is defined from the flat area of the colour curve at the end of them and is set for the colour components (R, G, B) as a common defined point hi corresponding to the colour-componentwise intensity value Ci, to correspond to the illumination colour (Rill, Gill, Bill).

Description

technical field [0001] The invention relates to a method for adjusting color balance in a digital image processing chain, in which method [0002] - the object is imaged pixel by pixel, forming a value set of color components, [0003] - form component-specific histograms from value sets of color components, [0004] - form cumulative histograms from component-specific histograms, [0005] - defining an illumination color corresponding to at least one color component from a cumulative histogram, [0006] - Defining gain coefficients for adjusting the color balance for at least two color components using the target color and the defined illumination color. [0007] In addition, the present invention also relates to corresponding systems, devices and software components for implementing the method. Background technique [0008] It is well known that the human visual system is able to adapt to different lighting colors. Objects in the field of view appear to have a constan...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G06T5/40
CPCG06T5/009G06T5/40G06T2207/10024G06T5/92
Inventor O·卡莱沃P·内诺宁
Owner NOKIA CORP
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