Method and device for generating shallow depth-of-field image

Abstract

The invention discloses a method and device for generating a shallow depth-of-field image. The method comprises the following steps of: shooting a shot main body according to a first aperture value to generate a first aperture value image; shooting the shot main body according to the second aperture value to generate a second aperture value image, wherein the second aperture value is more than the first aperture value; analyzing the first aperture value image and the second aperture value image to obtain an image difference; and judging that the image difference is more than a critical value, and processing the first aperture value image to obtain the shallow depth-of-field image.

Description

technical field [0001] The invention relates to an image processing method and device, in particular to a method and device for generating shallow depth of field images. Background technique [0002] figure 1 It is a schematic diagram of the known camera lens focusing on the plane of the subject. Please refer to figure 1 , when the camera lens 10 focuses on the subject plane 20, when the subject plane 20 forms the image at the focal plane 30 to achieve the clearest picture, the distance between the camera lens 10 and the subject plane 20 is the photographing distance Y, and The distance between the camera lens 10 and the focal plane 30 is the lens focal length (focal length) y. When using a camera to shoot images, in order to highlight the subject in the captured image, the shooting technique of the so-called shallow depth of field is generally used, that is, objects within the shooting distance Y can be clearly imaged, but outside the shooting distance Y objects are gra...

AI Technical Summary

Problems solved by technology

When using a camera to shoot images, in order to highlight the subject in the captured image, the shooting technique of the so-called shallow depth of field is generally used, that is, objects within the shooting distance Y can be clearly imaged, but outside the shooting distance Y objects are gradually blurred

[0003] However, the shallow depth of field effect that general camera lenses can produce is quite limited. To obtain a better shallow depth of field effect, it is necessary to take a series of continuous shots of the same scene with different focal lengths, and find out the position of each pixel at each point. The clearest position in the image, and then use the relationship between the focal length and the depth of field to deduce the relative depth of field of each pixel in the image. However, this method requires a long processing time and consumes a large storage space, which is not conducive to commercialization

[0004] If you take 2 to 3 images of the same scene with different focal lengths, that is to say, use a few images to deduce the relationship between the relative depth of each pixel, although the processing time can be slightly reduced, but the result is easily affected by image noise. Causes the processed image to have a discontinuous or unnatural depth of field

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