The term "depth of field" has gradually become the label of the dual camera phone, which is especially common today when the two cameras are almost universal. Depth of field, literally, is the depth of the scene. In fact, there is no problem with this understanding. After all, The problem is that the common single-lens camera can not obtain the holographic data, and the images we get can only be presented on one plane, so we have to present the image in the plane Depth of field concept.
What is depth of field? How to achieve?
If you want to understand the meaning of the double camera, we have to re-understand the 'depth of field' defined in the camera when we shoot with the camera, the camera select the subject to focus, the main body in the image clearly, but the focus is parallel to The lens axis, we see the focus before and after part of the range is clear. This clear range, is the shooting depth of field.
Of course, the definition of depth of field also has technical terms.After the focus is completed, with the distance before and after the focus increases, the degree of diffusion of light will be greater, the point of the image will be expanded into a circle, the circle is defined as diffuse circle.With The distance from the focus point increases, the larger the circle of confusion, and gradually reach the boundaries of the human eye can recognize, when beyond this limit, the picture seen by the human eye is blurred .This limit is called allow diffuse circle .Focus point before and after The distance between the permissible circle of confusion is the depth of field.
In the previous cell phone single camera shooting, the concept of depth of field will not be often raised, resulting in many users that macro is the depth of field effect. In fact, we have taken a picture of each depth of field. , Depth of field determines what we can see from the image.
And determine the depth of field has three major factors: the focal length, aperture, distance. The longer the lens focal length, the shorter the depth of field; the larger the aperture, the shorter the depth of field; The closer the subject and the lens, the more shallow depth of field. Photo, will focus on the larger, aperture adjustment, closer, of course, let the background as far as possible to make virtual effect more obvious.
Mobile phone manufacturers in the propaganda, often heard comparable to the big SLR SLR effect such a slogan because it is difficult to shoot in the previous stand-alone macro SLR comparable to the effect of the small internal mobile phone room determines the structure of the camera Modular assembly can not compete with the SLR, the lens iris, the focal length is not adjustable. Can only be controlled by the user only. And less macro shooting scenes are also difficult for manufacturers to choose partial macro shot direction adjustment. The emergence of double camera, just solve this problem.
So double shot can change the aperture, the focal length? Not, but the two lenses can have a different aperture and focal length, which is currently one of the three double-shot program, but the main source of shallow depth of field is not here, on behalf of Model iPhone 8 Plus. This program uses a wide-angle telephoto dual camera, when shooting shallow depth of field, the system will switch to the telephoto lens, the other lens is equivalent to the other eyes of the human eye, with the main camera Acquire the depth of field information, through the algorithm on the background of the virtualization of the software layer, in order to achieve shallow depth of field effect.Another one big and one small, a color-black and white two programs also use the algorithm to adjust the depth of field software.
This article belongs to the original article, if reprinted, please indicate the source: the world has always been the principle of three-dimensional double-depth of field resolution http://mobile.zol.com.cn/663/6639670.html
