Method for detecting streak noises in digital image

A digital image and detection method technology, applied in image analysis, image communication, image data processing, etc., can solve the time-consuming and labor-intensive problems of human eye recognition, and achieve the effect of reducing errors

Inactive Publication Date: 2012-07-11
ALTEK CORP
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  • Abstract
  • Description
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  • Application Information

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Problems solved by technology

However, the noise fringes with high frequency are relatively small, which makes the identification by human eyes very time-consuming and labor-intensive.

Method used

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  • Method for detecting streak noises in digital image
  • Method for detecting streak noises in digital image
  • Method for detecting streak noises in digital image

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Embodiment Construction

[0036] figure 1 It is the detection method of diagonal noise in the first embodiment of the present invention, figure 2 for application to figure 1 Schematic representation of the digital image of the process. Please refer to figure 1 and figure 2 , first proceed to step S110 to capture a circular region of interest C of a digital image 10 . Next, step S120 is performed to calculate the respective projection amounts of the circular region of interest C at multiple rotation angles. For example, the Wraydon transformation algorithm can be used to calculate the projection of the circular region of interest C on these rotation angles. Then proceed to step S130, converting these projection quantities into respective amplitudes of these rotation angles. These projected quantities can be converted to these amplitudes, for example, using a Fast Fourier Transform algorithm. Then go to step S140 to find a maximum value from these amplitudes. Then proceed to step S150, comparin...

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Abstract

A method for detecting streak noises in a digital image including the following steps is provided comprising the following steps. Firstly, an exposure value of a camera is decreased, and a digital image is captured under exposure with a homogeneous background light source by the camera. Secondly, a circular region of interest (ROI) is extracted from the digital image. Next, projection values of the circular ROI corresponding to a plurality of rotation angles are calculated. Then, the projection values are respectively converted into amplitudes of the rotation angles. Afterwards, maximum amplitude is found from the amplitudes. Finally, the maximum amplitude is compared with a threshold value to judge whether a streak noise exists in the digital image.

Description

technical field [0001] The invention relates to an image detection method, and in particular to a detection method of slash noise of a digital image. Background technique [0002] With the advancement of technology, digital cameras have gradually replaced film cameras as the mainstream life recording tool. Most digital cameras use photosensitive elements such as charge-coupled devices (CCD, Charge-coupled Device) and complementary metal-oxide-semiconductor (Complementary Metal-Oxide-Semiconductor, CMOS) to perform imaging. During the imaging process of the photosensitive element, sometimes the diagonal noise image will be generated due to the electromagnetic wave interference of the electronic component. Slant noise tends to occur in images captured by brightness compensation under low brightness and high ISO values. The reason is that the signal must be amplified when brightness compensation is performed, and the noise will be amplified at the same time, which will affect ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04N5/357
CPCH04N5/217G06T7/0085G06T7/13H04N23/81
Inventor 林明熙
Owner ALTEK CORP
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