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Image processing for pattern detection

一种图像处理、图案的技术，应用在图像数据处理、图像增强、图像分析等方向，能够解决不适合实施、大计算复杂度等问题，达到避免光学元件和花费、减少不同失真、增强检测的效果

Inactive Publication Date: 2008-05-14
NOKIA CORP
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  • Abstract
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AI Technical Summary

Problems solved by technology

Besides that, the algorithm proposed in the above paper has a large computational complexity, which makes it unsuitable for implementation in mobile devices

Method used

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  • Image processing for pattern detection
  • Image processing for pattern detection
  • Image processing for pattern detection

Examples

Experimental program
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Embodiment Construction

[0025] FIG. 2 illustrates the main features related to the present invention in an electronic device 200 equipped with a camera. The electronic device 200 includes an image capture device 210 , an image preprocessing device 220 and a barcode detection device 230 .

[0026] The image capture device 210 may be provided by suitable digital imaging techniques. For example, CMOS (Complementary Metal Oxide Semiconductor Circuitry) or CCD (Charge Coupled Device) based sensors and suitable optics known to those skilled in the art may be used. In the image sensor the light is converted to electric charges, RGB values ​​are defined for the pixels, and the charges are converted to digital format. It should be noted that image capture device 210 may be capable of recording still images as well as video images.

[0027] Electronic device 200 is not limited to any particular device, but features of the present invention may be incorporated into devices suitable for capturing images and eq...

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Abstract

The present invention relates to an image pre-processing method for a pattern detection system, such as a bar code detection system. The method comprises the steps of: detecting a start point and an end point of a pattern on the basis of image data of at least a portion of a captured image, estimating a point spread function from the image data or a modified image data on the basis of the detected start point and the end point, and restoring the image data or the modified image data using the estimated point spread function.

Description

technical field [0001] The present invention relates to methods and devices for layout pattern detection, such as barcode detection. Background technique [0002] Barcodes have been used as a source of information in a wide variety of applications, such as for product identification and pricing. A barcode is a set of binary digits and usually consists of black bars and white spaces or white and black squares. One-dimensional barcodes typically consist of black and white lines, while two-dimensional barcodes are black and white squares or arrays of hexagons or ellipses. In general, standard typical equipment for barcode detection uses a laser beam (such as the specialized equipment used in supermarkets and stores). Since many mobile devices are already equipped with cameras, it is possible to deploy barcode detection in these devices as well. [0003] The physical dimensions of the barcodes to be detected vary widely. Barcodes with low information density over large areas...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06K9/00G06T5/00G06K9/36G06K9/60
CPCG06T5/001G06T5/003G06T7/004G06T5/002G06T7/70G06T5/73G06T5/70G06K7/10G06T5/00G06V10/20
Inventor R·比尔屈M·弗维莱南A·比里安
Owner NOKIA CORP
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