A method, a system and a computer program for determining a threshold in an image comprising image values

A technology in image value and image, applied in computer components, computing, image enhancement, etc., can solve problems such as inaccurate results and image inhomogeneity

Inactive Publication Date: 2009-07-08
KONINK PHILIPS ELECTRONICS NV
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  • Summary
  • Abstract
  • Description
  • Claims
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Problems solved by technology

[0006] A disadvantage of the known methods according to the prior art is that they provide inaccurate results for inhomogeneities in the image resulting from an inherent considerable overlap of pixel values ​​corresponding to different regions in the image

Method used

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  • A method, a system and a computer program for determining a threshold in an image comprising image values
  • A method, a system and a computer program for determining a threshold in an image comprising image values
  • A method, a system and a computer program for determining a threshold in an image comprising image values

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Embodiment Construction

[0057] figure 1 An embodiment of the threshold value determination method according to the invention is presented in a schematic way. The method 1 according to the invention is arranged such that in step 3 the image values ​​(pixels or voxels) of the image are analyzed taking into account the determination of edge points and their associated gradients. This may advantageously be performed by calculating the image contrast at step 3a according to eg equation 1 given above. Subsequently, in step 3b, a suitable edge detector may be used to determine the edge points, followed by the determination of the edge direction in step 5a. Subsequently, suitable pairs of pixels or voxels 5b located on different sides of the edge are selected. In step 5 of the method according to the invention, the voxel pairs or pixel pairs thus selected are sorted, preferably by means of using a predefined sorting order. For example, the classifier 5c may be used to classify pixels or voxels into two c...

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Abstract

The invention relates to a method (1) for determining a threshold in an image comprising image values, said method comprising the steps of: analyzing (3) the image values for determining edge points and associated gradients; classifying (5) image values into classes with respect to the edge points; obtaining (7) image threshold by combining data from the intensity histograms calculated for each class with statistical analysis of the said histograms. The invention further relates to a method of image segmentation, an image processing system and a computer program.

Description

technical field [0001] The invention relates to a method for determining a threshold in an image containing image values. [0002] The invention also relates to a method for image segmentation. [0003] The invention also relates to an image processing system for analyzing an image containing image values. [0004] The invention also relates to a computer program. Background technique [0005] The method proposed in the opening paragraph for determining a threshold value in an image is known from EP 1 320 069 A2. In the known method an image analysis step is used in which all image pixels are used to construct an image intensity histogram, after which a threshold in the image is determined by assigning a predetermined percentage N of pixels as belonging to the sought object. The value N is then used to calculate luminance values ​​corresponding to this predetermined percentage of the selected pixels using the cumulative distribution function. [0006] A disadvantage of t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06T5/00G06K9/38G06V10/28
CPCG06T7/0083G06T2207/10088G06K9/38G06T2207/30016G06T2207/20148G06T5/40G06T7/12G06T7/136G06V10/28
Inventor A·伊金
Owner KONINK PHILIPS ELECTRONICS NV
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