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A method and terminal for calculating the image sharpness value of a point light source scene

A technology of image definition and calculation method, which is applied in the field of image processing, can solve problems such as not falling but rising, image blurred definition value, and easy to be affected by the environment, etc., to achieve the effect of eliminating influence, precise focusing, and realizing focusing

Active Publication Date: 2022-04-29
SANLI VIDEO FREQUENCY SCI & TECH SHENZHEN
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The algorithm based on airspace is simple to calculate, but it is easily affected by the environment. Especially for point light source scenes, the image will be blurred and the sharpness value will not decrease but increase, which is manifested in the phenomenon of false peaks on the focus curve; based on frequency domain The algorithm uses the high-frequency components of the accumulated wavelet transform to calculate the sharpness value of the image. This method performs well in different scenes during the day, but it is also not suitable for point light source scenes; information entropy represents the sum of information contained in the image, expressed in pixels It is obtained by multiplying the log value of the pixel. The algorithm based on information entropy is more dependent on the scene, and it is prone to the situation where the calculated clarity is inconsistent with human subjective senses.

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  • A method and terminal for calculating the image sharpness value of a point light source scene
  • A method and terminal for calculating the image sharpness value of a point light source scene
  • A method and terminal for calculating the image sharpness value of a point light source scene

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Embodiment 1

[0075] Glossary:

[0076] Clarity value: a numerical index representing image clarity, the clearer the image, the greater the clarity value;

[0077] Focus curve: the curve formed by drawing the sharpness values ​​of images with different resolutions in the same scene on the plane coordinates. The abscissa generally indicates the position of the focus motor, and the peak of the curve represents the clearest position of the image, also known as the focus point;

[0078] Please refer to figure 1 , image 3 , Figure 6-Figure 9 , a method for calculating the image sharpness value of a point light source scene in this embodiment, comprising:

[0079] S1. Obtain an image to be calculated;

[0080] S2. Determine whether there is a point light source in the image to be calculated, and if so, divide the image to be calculated into a first preset number of sub-region images, and calculate each of the first preset number of sub-region images A sharpness value of the sub-region ima...

Embodiment 2

[0142] Please refer to figure 2 , an image sharpness value calculation terminal for a point light source scene in this embodiment includes a memory, a processor, and a computer program stored in the memory and operable on the processor, and the processor executes the computer program Each step in the method for calculating the image sharpness value of the point light source scene in the first embodiment is realized at the same time.

[0143]To sum up, the present invention provides a method and terminal for calculating the image definition value of a point light source scene to obtain an image to be calculated; if there is a point light source in the image to be calculated, divide the image to be calculated into the first preset number of sub-area images, and calculate the sharpness value of each of the sub-area images in the first preset number of sub-area images; determine whether there is a point light source in each of the sub-area images, and if so, then Determining the...

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Abstract

The invention discloses a method for calculating the image definition value of a point light source scene, which is to obtain an image to be calculated; judge whether there is a point light source in the image to be calculated, and if there is, divide the image to be calculated into a first preset number Sub-area images, and calculate the sharpness value of each of the sub-area images in the first preset number of sub-area images; perform point light source detection on each of the sub-area images, obtain the detection results, and based on the The detection result is weighted according to the definition value of each sub-region image to obtain the final definition value of the image to be calculated, which can accurately judge and locate the point light source in the image, and based on the detection result, according to each sub-region image The sharpness value is weighted to obtain the final sharpness value, and the influence of the point light source is eliminated, so that the image sharpness value can be accurately calculated in the point light source scene, so that the focus curve of the image can correctly reflect the change of the image sharpness, and achieve precise focus .

Description

technical field [0001] The present invention relates to the technical field of image processing, in particular to a method for calculating an image definition value of a point light source scene and a terminal. Background technique [0002] The current image sharpness value calculation methods are mainly divided into algorithms based on space domain, algorithms based on frequency domain and algorithms based on information entropy. The algorithm based on airspace is simple to calculate, but it is easily affected by the environment. Especially for point light source scenes, the image will be blurred and the sharpness value will not decrease but increase, which is manifested in the phenomenon of false peaks on the focus curve; based on frequency domain The algorithm uses the high-frequency components of the accumulated wavelet transform to calculate the sharpness value of the image. This method performs well in different scenes during the day, but it is also not suitable for po...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G06T7/00G06T7/60
CPCG06T7/0002G06T7/60G06T2207/10004
Inventor 袁小德张宇刘东剑杨伟强张君
Owner SANLI VIDEO FREQUENCY SCI & TECH SHENZHEN