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Focusing method and device for digital imaging device

The technology of an imaging device and a focusing method, applied in the field of digital imaging, can solve the problems of small image area, large amount of calculation, and small amount of calculation, and achieve the effect of accurate image definition, small hardware resource requirements, and low hardware resource requirements

Active Publication Date: 2015-07-01
ALLWINNER TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The calculation amount of the focus evaluation method based on the spatial domain is relatively small, but there are two problems: first, the above algorithm processes all directions uniformly when calculating the gradient, and does not further judge the texture direction of the image, which is easy to cause misjudgment; second , the image area selected when calculating the gradient is small, so its noise resistance and accuracy are not high
The existing focus evaluation method based on the frequency domain utilizes the integrity of the image, and the evaluation is relatively accurate, but the calculation amount is often large, and the hardware requirements of the imaging device are high, resulting in high production costs of the imaging device

Method used

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  • Focusing method and device for digital imaging device
  • Focusing method and device for digital imaging device

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Experimental program
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no. 1 example

[0028] see figure 1 , the focusing device of the present embodiment has an image acquisition module 11, an image segmentation module 12, a focus evaluation value calculation module 13 and an imaging focal length determination module 17, wherein the focus evaluation value calculation module 13 has a texture value calculation module 14, a pixel focus evaluation value calculation module module 15 and image focus evaluation value calculation module 16.

[0029] Combine below figure 2 Explain the working principle of each module in the focusing device. When using the focusing device to focus, the imaging device first performs step S1, the digital imaging device adjusts the imaging focal length, the data of an image is obtained by the image acquisition module 11, and the obtained image is segmented by the image segmentation module 12, that is, a complete The image is divided into multiple sub-images. Image segmentation can be to divide the image equally, or to divide the image u...

no. 2 example

[0056] The focusing device of this embodiment is provided with an image acquisition module, an image segmentation module, a focus evaluation value calculation module, and an imaging focal length determination module, and the focus evaluation value calculation module is also provided with a texture value calculation module, a pixel focus evaluation value calculation module, an image Focus evaluation value calculation module.

[0057] When the focusing device focuses, it first acquires an image at an imaging focal length of the digital imaging device, and then divides the image to obtain a sub-image after the division of an image, and performs horizontal texture values ​​and vertical texture values ​​on the pixels of the sub-image. The calculation of the texture value, and calculate the focus evaluation value of the pixel according to the horizontal texture value and the vertical texture value, and then calculate the focus evaluation value of the image, and obtain the next image ...

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Abstract

The invention provides a focusing method and a focusing device for a digital imaging device. The focusing method comprises the following steps of: continuously adjusting imaging focal lengths of the digital imaging device to obtain data of a plurality of pictures, wherein each picture is obtained under each focal length, and color values of a plurality of pixels in at least one area of each picture are obtained; calculating a horizontal texture value and a vertical texture value of each pixel according to the color value of each pixel; calculating a focusing evaluation value of each pixel according to the horizontal texture value and the vertical texture value; calculating a focusing evaluation value of each picture according to the focusing evaluation values of the plurality of pixels of each picture; and acquiring the focus length of the picture with the largest focusing evaluation value among the plurality of pictures to be taken as the imaging focus length of the digital imaging device. The focusing device is used for adjusting the focus length of the imaging device by adopting the focusing method. The focusing method and the focusing device can be used for rapidly and accurately calculating the optimal imaging focus length of the imaging device, so as to realize automatic focusing; and requirements on hardware resources of the imaging device are low, so that the production cost of the imaging device is reduced.

Description

technical field [0001] The invention relates to the field of digital imaging, in particular to an automatic focusing method and an automatic focusing device of a digital imaging device. Background technique [0002] Existing electronic imaging devices are provided with image sensors such as CCD sensors or CMOS sensors for acquiring imaged images. In order to make the image captured by the image sensor clearer, a lens group is usually arranged at the front end of the image sensor, and the imaging focal length of the imaging device is changed by adjusting the distance between multiple lenses in the lens group. When the imaging focal length is changed, the image resolution obtained by the image sensor is different. Therefore, adjusting the distance of the lens, that is, changing the imaging focal length of the imaging device, can obtain a higher-definition image. [0003] The imaging focal length of some existing imaging devices can be manually adjusted, but the manual adjustm...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04N5/232H04N9/04G03B17/36G02B7/09
Inventor 孙文福杨帆
Owner ALLWINNER TECH CO LTD