On the basis of machine vision system required components, including independent hardware unit (light source, lens, camera) also include corresponding visual algorithm tool library, its general as a automation equipment parts, or as a robot's perception of the five senses the presence of module, which is the main purpose of camera lens will target imaging on the image sensor of light. The quality of lens will directly affect the overall performance of machine vision system. Reasonable selection and installation of lens is an important part of the design of machine vision system. The FOV Angle is the Angle formed by the two edges of the maximum range through which the measured object can pass. For example, in the optical system, the FOV Angle can be represented. According to the size of the FOV Angle, the lens can be divided into standard lens, wide-angle lens and telephoto lens.
An aperture is a device used to control the amount of light entering the photographic surface of a camera through a lens. The size of the aperture (represented by F) the smaller the value behind F, the larger the aperture, the more light, the brighter the picture, the narrower the focal plane, the more blurred the main background; The larger the value after F, the smaller the aperture, the less light in, the darker the picture, the wider the focal plane, and the sharper the subject background. Focal length, also known as focal length, is a measure of light aggregation or divergence in the optical system. It is the distance from the center of the lens to the focus of light aggregation, as well as the length of the focal length of the head from the optical center of the lens to the imaging plane such as the chip, CCD or CMOS chip that determines the size of the field of view: The shorter the focal length is, the larger the field Angle is and the larger the observation range is, but the less clear the distant object is. Conversely, the longer the focal length, the smaller the field Angle, the smaller the observation range, and the clearer the distant object. Therefore, when choosing the focal length, we should fully consider whether to observe the details or the observation range: if you need to observe a close distance, large scene object, then choose a small focal length of the wide-angle lens; Choose a telephoto lens with a large focal length if you need to see details at a distance. The object distance of focal length, object distance and visual field indicates the vertical distance between the lens or camera and the measured object when focusing clearly. Field of view indicates the area that can be seen when the camera and lens are kept fixed. It means that at a certain focus position, the objects in a certain range before and after can get a clear image. The depth of field varies with the lens focal length, aperture value and shooting distance. For a fixed focal length and shooting distance, the smaller the aperture used, the greater the depth of field. The straight line outside the main axis in the plane of the measured object becomes a curve after imaging by the optical system. This phenomenon is called distortion, also known as distortion. The distortion only affects the geometric shape of the image, but does not affect the sharpness of the image. The types of lens distortion include barrel distortion, pillow distortion and linear distortion.
Taizhou Yangmai Technology Co., Ltd. is a machine vision inspection equipment manufacturer integrating R & D, production and sales. It is committed to the R & D and manufacturing of CCD vision inspection technology and automatic inspection (screening) equipment. It can customize non-standard automatic equipment according to needs.