Automatic focusing method, shooting equipment and storage medium
A technology of automatic focus and focus search, which is applied in image enhancement, equipment, television, etc., can solve problems such as insufficient efficiency and accuracy, noise sensitivity, and difficulty in accurately reflecting the changing trend of image clarity, so as to achieve the effect of improving accuracy
Active Publication Date: 2022-05-13
CHINAINSTRU & QUANTUMTECH (HEFEI) CO LTD
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[0003] However, due to the low signal-to-noise ratio of SEM images, conventional sharpness evaluation methods are more sensitive to noise in high-noise images, and it is difficult to accurately reflect the changing trend of image sharpness.
Moreover, in the search process, the step setting of the iterative search of the "hill climbing method" determines the search efficiency. In the related technologies, the fixed step or the variable step method according to the law of definition change have certain advantages in terms of efficiency and accuracy. insufficient
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[0014] The following describes the autofocus method, the photographing device, and the storage medium according to the embodiments of the present invention with reference to the accompanying drawings, wherein the same or similar reference numerals represent the same or similar elements or elements with the same or similar functions. The embodiments described with reference to the drawings are exemplary and should not be construed as limiting the present invention.
[0015] figure 1 It is a flow chart of the automatic focusing method of an embodiment of the present invention.
[0016] Such as figure 1 As shown, autofocus methods include:
[0017] S11. Acquire a captured image based on the current focal length, perform image sharpness calculation on the captured image based on the current focal length, obtain an initial image sharpness, and judge whether the captured image based on the current focal length is a full-noise image.
[0018] Specifically, when autofocus is requir...
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The invention discloses an automatic focusing method, shooting equipment and a storage medium. The method comprises the steps of obtaining a shot image based on a current focal length, performing image definition calculation to obtain an initial image definition, and judging whether the image is a full-noise image or not; determining an initial focusing search position focal length, a focusing current stepping direction and a focal length stepping value according to the initial image definition and a judgment result, and calculating a focusing current stepping value according to a determination result; according to the initial focusing search position focal length, the focusing current stepping direction and the focusing current stepping value, determining the current focusing search position focal length, obtaining a shot image based on the current focusing search position focal length, carrying out image definition calculation to obtain the current image definition, judging whether the image is a full-noise image or not, and if not, executing the next step; if yes, the optimal focal length is determined according to the relation between the ith image definition and the (i-1) th image definition, i = 2, 3,..., N, and N is an integer larger than or equal to 2. The method can realize accurate search.
Description
technical field [0001] The present invention relates to the field of autofocus technology, in particular to an autofocus method, a photographing device, and a storage medium. Background technique [0002] In the related technology, the automatic focusing method of the scanning electron microscope is to use the "hill climbing method" to continuously change the focal length in a certain step, collect images and calculate the sharpness of the image, and guide the focal length to approach the optimal value according to the change trend of the sharpness. [0003] However, due to the low signal-to-noise ratio of SEM images, conventional sharpness evaluation methods are more sensitive to noise in high-noise images, and it is difficult to accurately reflect the changing trend of image sharpness. Moreover, in the search process, the step setting of the iterative search of the "hill climbing method" determines the search efficiency. In the related technologies, the fixed step or the v...
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IPC IPC(8): H04N5/232G06T5/00G06T1/00
CPCG06T1/0007G06T2207/10004H04N23/675G06T5/73G06T5/70
Inventor 雷静
Owner CHINAINSTRU & QUANTUMTECH (HEFEI) CO LTD