Image focusing measure implementation method based on block PCA

An implementation method and image technology, applied in the field of information processing, can solve the problems of inability to reflect the image clarity information, the autofocus function is not easy to use, and is easily affected by noise, and achieves strong anti-noise capability, reduces interference, and is simple in principle. Effect

Active Publication Date: 2019-06-07
HUAIYIN TEACHERS COLLEGE
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Problems solved by technology

If the background of the image is relatively uniform or relatively smooth, it is very susceptible to noise at this time, so that the corresponding focus measurement cannot reflect the sharpness information of the image
For example, if you use the camera function of a mobile phone to take pictures indoors or in night scenes with relatively weak lighting conditions, we will find that the autofocus function of the (mobile phone) camera is not easy to use, and the captured images are blurred and grainy

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  • Image focusing measure implementation method based on block PCA
  • Image focusing measure implementation method based on block PCA
  • Image focusing measure implementation method based on block PCA

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Embodiment Construction

[0022] In order to facilitate technical personnel to understand the technical solution of the present invention, the technical solution of the present invention will be further described in detail in conjunction with the accompanying drawings and embodiments.

[0023] The present invention proposes a block PCA-based image focus measure implementation method, the block diagram of its implementation steps is as follows figure 1 As shown, in the present embodiment, if n=3 is selected, each step of the method is refined as:

[0024] Step S1: Adjust the number of rows and columns of pixels in the original image to an integer multiple of 8 to obtain an image f(x, y), where it is assumed that the number of rows and columns of f(x, y) are M and N respectively. The adjustment method can adopt the image pixel interpolation method to zoom or intercept the largest sub-image in the central area of ​​the image so that the number of rows and columns is an integer multiple of 8. The reason f...

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Abstract

The invention discloses an image focusing measure implementation method based on block PCA, and belongs to the technical field of information processing. The method comprises the following steps: firstly, preprocessing an image, then partitioning the processed image, and carrying out PCA calculation on each sub-image to obtain a characteristic value corresponding to a principal component vector ofthe corresponding sub-image; and constructing the definition of the sub-images through the feature values, and finally, solving the variance of a set formed by the definitions of all the sub-images,and taking the variance value as the focusing measure of the whole image. According to the method, the image detail information is extracted by adopting the image blocks and the PCA, the method has the advantages of simple principle and low calculation complexity, the interference of noise on the image detail information is reduced through the implementation of the steps, and particularly, the noise robustness is high under a low-contrast imaging condition. The method is suitable for a passive imaging system of a camera and has high popularization and use value.

Description

technical field [0001] The invention belongs to the technical field of information processing, and in particular relates to a method for realizing image focus measurement based on block PCA. Background technique [0002] Camera equipment in daily life, such as single-lens reflex cameras, mobile phones with camera functions, and monitoring and capture systems at intersections, can all obtain clear images. However, the acquisition of a clear image depends on the automatic focusing performance of the camera device. At present, camera equipment on the market mainly adopts automatic focusing technology of passive imaging. Its core is to design a focus measure for evaluating image clarity, select the clearest image and save it through the focus measure. Therefore, a focus measure implementation method with good performance directly affects the quality of the captured image. [0003] Currently widely used image focus measurement methods are constructed based on image detail info...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06T7/00G06K9/62G06T3/40
Inventor 刘恋郭立强吴自万
Owner HUAIYIN TEACHERS COLLEGE
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