Automatically focusing method and application thereof
A technology of auto-focus and focus position, which is applied in focusing devices, televisions, optics, etc., and can solve problems such as inability to find the best focus point, time-consuming, time-consuming auto-focusing process, etc.
Active Publication Date: 2007-04-18
CHROMA ATE
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It usually has some disadvantages, including that even if the search position has entered the wave envelope area, it still needs to search back and forth to determine the boundary of the wave envelope area, so it is quite time-consuming in the automatic intersecting process, and it can only search near the wave envelope area, thus only suitable for small search ranges
Furthermore, this type of technology sets the intensity threshold as the threshold of the best focus position, but the intensity threshold will change due to the different surface properties of the measured object, or the interference objective lens will cause the maximum intensity and zero light due to chromatic aberration. If the distance difference positions are not coincident, the algorithm will not be able to find the best focus point
[0004] In addition, some existing technologies still need to use other hardware assistance to achieve the purpose of autofocus, so the interference system must have more hardware configurations
Or the focus action must have complete wave packet area information, so the process is time-consuming and not suitable for large-scale scanning range auto-focus
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[0018] FIG. 1 shows a flow chart of the steps of the auto-focus method of the present invention; FIG. 2 shows the component correlation diagram of the interference system used in the auto-focus method of the present invention; FIG. 3 shows a schematic diagram of optical information captured by the auto-focus method of the present invention. With reference to Fig. 1 and shown in Fig. 2, the present invention is the method that the captured image of an optical image system is carried out automatic focus, with the preferred embodiment shown in Fig. 2, this optical image system comprises light source device 1, objective lens Group 2, beam splitter 3, image capture device 4 and logic calculation control unit 5, the light source device 1 provides an incident light beam 11 which is reflected to the objective lens group 2 through the beam splitter 3, so that the incident light beam 11 reaches the object 6 to be measured and The reflection forms a reflected light beam 41 carrying an int...
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The invention relates to auto focusing method and its application. It supplies vision picking device based on multi-stage searching principle and focusing function, matches with rough searching for different focusing position, wave packet area searching, and careful searching for optimum focusing position to process focusing. The integral multiple of one half of the incident beam wavelength in the vision picking device is used as searching pace. The maximum of the focusing function is searched in the wave packet area corresponding which the focusing position is defined as the optimum. The auto focusing method can be used to fast and effectively gain the optimum focusing position.
Description
technical field [0001] The present invention relates to an automatic focus method and its application, in particular to a focus judgment method for an image capture device, which is used to achieve the focus operation of the image capture device for image capture of an object under test. Background technique [0002] The autofocus method used in the existing image capture system is to provide the control needed to adjust the focusing distance of the optical lens group during image capture, so as to obtain clear and correct image information. Usually in this type of technology, for passive imaging systems, the focus function curve is a single-peak curve that changes along the position of the focus axis of the optical lens group, so that the maximum value of this function is the best focus defined by the system Location. However, for the focus function curve of the interferometric system, the focus function is a signal formed by the superposition of a unimodal curve and an in...
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Inventor 廖界程林耀明
Owner CHROMA ATE