Method and device for real-time adjustment of lens installation flatness

Abstract

The invention discloses a method and device for real-time adjustment of lens installation flatness. The camera real-time adjusting method comprises the steps of acquiring images which are shot by a camera and correspond to at least two groups of test charts in different positions, pre-processing the images to obtain each group of test chart through separation, calculating and displaying the real-time resolution value, relative to each group of test chart, of the light-sensitive surface of the camera according to each group of test chart in real time, and adjusting the installation angle of the optical axis of a lens of the camera relative to the light-sensitive surface in real time according to the real-time resolution value, relative to each group of test chart, of the light-sensitive surface of the camera. By means of the method, the real-time resolution value of the camera can be obtained through automatic real-time testing, a measurement result consists with a visual evaluation result obtained through visual inspection, flexibility and adjustability are realized, robustness is high, and the installation angle of the optical axis of the lens of the camera can be adjusted according to the real-time resolution value of the camera.

Description

technical field [0001] The invention relates to a method and device for real-time adjustment of lens installation flatness. Background technique [0002] The measurement method of a digital camera can usually be obtained by taking an ISO chart, printing or displaying the captured image, making a subjective visual evaluation of the image to obtain the visual resolution value, or using a software measurement method consistent with the visual evaluation to evaluate and analyze. degree value. [0003] The visual evaluation method of visual inspection is to print or enlarge the fixed magnification ISO pattern to observe the spatial frequency of the change of the number of wedge lines as the resolution. Although the method of visual evaluation is relatively simple, it has the disadvantages of individual differences, time-consuming and labor-intensive, and being limited by the influence of display and printing equipment. The method of software measurement resolution can obtain go...

AI Technical Summary

Problems solved by technology

[0005] Although the visual evaluation method using visual inspection is simple to operate, it is limited by equipment and waste of manpower, so it is not suitable for a wide range of industrial automated production

Although the measurement method using MTF (such as Japan's HYRes software) has been tested for a long time, with the development of tens of millions of pixel digital cameras, the resolution of its shooting has already surpassed the limits of USAF1951 and ISO12233, so its test does not exist Relatively speaking, at the same time, it needs to spend a lot of calculation cost, and it cannot be processed dynamically in real time

Although the SFR-based measurement method (such as the Imatest software in the United States) is relatively low in cost and can obtain better drawing results, the operation is complicated, the requirements for factory testers are high, and real-time dynamic testing cannot be realized.

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