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Imaging consistency evaluation method based on wavelet transform

A technology of wavelet transform and evaluation method, applied in the field of image processing

Active Publication Date: 2021-02-09
深圳市运泰利自动化设备有限公司
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  • Application Information

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Problems solved by technology

[0006] Aiming at the image consistency problem existing in the current machine vision inspection equipment, the present invention proposes an imaging consistency evaluation method based on wavelet transform, which evaluates the imaging quality of the visual system by determining image quality evaluation indicators (brightness, sharpness, contrast) , using various indicators to adjust the imaging of each device to achieve the purpose of imaging consistency

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  • Imaging consistency evaluation method based on wavelet transform
  • Imaging consistency evaluation method based on wavelet transform
  • Imaging consistency evaluation method based on wavelet transform

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Embodiment Construction

[0024] Such as Figure 2 to Figure 4 As shown, the present invention utilizes the method of wavelet transform to evaluate the image quality, so as to achieve the purpose of device imaging consistency. For a visual imaging system, when its imaging effect is clear, the sharpness shown on the image is higher, that is, the image data shows a large grayscale change between adjacent pixels in the spatial domain, while in the frequency domain it shows The frequency spectrum has more high-frequency components. According to the theory of Fourier optics, the sharpness of an image is mainly determined by the amount of high-frequency components in the image. The more high-frequency components, the higher the sharpness of the image and the clearer the image. Therefore, the imaging quality of the visual system is evaluated by determining the image quality evaluation indicators (brightness, sharpness, and contrast), and the imaging quality of each device is adjusted by using various indicat...

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Abstract

The invention provides an imaging consistency evaluation method based on wavelet transform, which can effectively evaluate the quality of an image, ensure the imaging consistency and provide guaranteefor the effect and stability of a visual algorithm. The method comprises the following steps: analyzing an input image and outputting a low-frequency image and a high-frequency image; continuously carrying out wavelet decomposition on the approximation subgraph LL (x, y) of the I (x, y) for a plurality of times by utilizing a two-dimensional scale function and a wavelet function to obtain a low-frequency image and a high-frequency image of the input image under different scales; calculating sharpness of the input image; calculating the measurement of the input image; calculating contrast of an input image. The invention is applied to the field of image processing.

Description

technical field [0001] The invention relates to the field of image processing, in particular to an imaging consistency evaluation method based on wavelet transform. Background technique [0002] Machine vision technology is an interdisciplinary subject involving artificial intelligence, computer science, image processing, pattern recognition and many other fields. The machine vision system is mainly composed of three parts: image acquisition, image processing and analysis, output or display. At present, machine vision technology has been widely used in visual inspection, visual measurement, visual positioning and other fields. Among them, the image acquisition part is a key link, which is generally composed of a light source, a lens, a camera, an image acquisition card, and a computer. The acquisition process can be simply described as under the condition that the light source provides suitable illumination, the camera shoots the target object and converts it into an image...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06T7/00H04N17/00
CPCG06T7/0004H04N17/00G06T2207/20048
Inventor 陆灏铭贾敏
Owner 深圳市运泰利自动化设备有限公司