Projection method based on automatic exposure control and automatic switching projection pattern

Abstract

The invention belongs to the technical field of image exposure, and relates to a projection method based on automatic exposure control and an automatic switching projection pattern. The method comprises the following steps: S1: performing image collection and performing three-dimensional imaging; S2: acquiring the last image of each collection, and acquiring average brightness of the image; S3: judging whether the average brightness of the image is within a target brightness range; S4: acquiring a difference value between the average brightness of the image and the target brightness, and performing exposure compensation; S5: performing three-dimensional imaging quality evaluation; S6: judging whether a coding pattern is switched; and S7: selecting a group of patterns with the highest evaluation of three-dimensional imaging quality for projection. By adoption of the projection method disclosed by the invention, the following problems in the prior art are solved: the noise signal is large, it is difficult to maintain stable high-quality imaging, when the contrast between a target object and the background is too large, a target area is underexposed or overexposed, the adjustment timeis too long, and the difference value between the image brightness and the target brightness is too large.

Description

technical field [0001] The invention belongs to the technical field of image exposure, and in particular relates to a projection method based on automatic exposure control and automatic switching of projection patterns. Background technique [0002] Automatic exposure control is to control the exposure when shooting, and the exposure refers to the amount of luminous flux from the scene to the camera. High-quality images can only be obtained when the photosensitive device is properly exposed. The amount of exposure is determined by the aperture size of the camera, the exposure time and the signal gain. The aperture is a device that uses its light hole to control the intensity of light that reaches the photosensitive chip of the camera during exposure; the shutter uses the length of its opening time to control the time of light entering, and then controls the amount of light entering. Adjusting the size of the aperture is generally done manually or by using an adjustable len...

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Problems solved by technology

[0006] In order to solve the above-mentioned problems in the prior art, the purpose of the present invention is to provide a projection method based on automatic exposure control and automatic switching of projection patterns, which is used to solve the problem of large noise signals and difficulty in maintaining stable high-quality imaging in the prior art. When the contrast between the target object and the background is too large, the target area is underexposed or overexposed, the adjustment time is too long, and the difference between the image brightness and the target brightness is too large

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