Penetrating scattering medium long-distance projection device and method based on spatial light modulator

Abstract

The invention provides a scattering medium penetrating long-distance projection device and method based on a spatial light modulator. Projection light can penetrate through a scattering medium and form an image on a projection screen in a high-quality mode, and a light source, the spatial light modulator and a projection shadow head are sequentially arranged on a projection light path of the device; the projection light path is connected with a control device; and the control device is connected with a high-speed imaging detector capable of acquiring imaging images from a projection screen, the current projection effect is evaluated through the imaging images acquired by the high-speed imaging detector, and the projection light path is adjusted to optimize the imaging effect. The device has an automatic feedback device and function, can automatically adjust the output power of the laser light sources with different wavelengths and the modulation state of the spatial light modulator according to the projection distance and the characteristics and dynamic changes of the scattering medium in the projection light path, realizes the real-time control of the projection image along with the changes of the distance and the scattering medium, adjusts and optimizes the light intensity and wave band distribution of the projection light beam in real time, and then ensures high-quality image projection.

Description

technical field [0001] The invention relates to the field of projection technology, in particular to a device and method for long-distance projection through a scattering medium based on a spatial light modulation device. Background technique [0002] With the development of projection technology, projection technology is applied in more and more occasions, and the occasions where projection is applied are becoming more and more complicated. method of projection. However, due to the characteristics of the scattering medium, it is difficult for us to control the quality of the projected image in real time. Existing projectors are mainly used in indoor static scenes, that is, the projector projects images to a fixed screen position, and cannot perform corresponding adaptive adjustments as the screen position changes or changes in the projection environment. The main reasons are as follows. First, the current projection technology has high requirements for the environment of ...

AI Technical Summary

Problems solved by technology

However, due to the characteristics of the scattering medium, it is difficult for us to control the quality of the projected image in real time

Existing projectors are mainly used in indoor static scenes, that is, the projector projects the picture to a fixed screen position, and cannot make corresponding adaptive adjustments as the screen position changes or the projection environment changes.

The main reasons are as follows. First, the current projection technology has high requirements for the environment of the projection light path. In complex environments, such as outdoors with scattering media such as rain, fog, and haze, or indoors with artificial smog, it is impossible to present Good projection effect; on the other hand, the current projection technology is still limited by the light intensity and distance of the light source. There is a scattering medium in the projection light path, and the light intensity attenuates quickly, which makes it impossible to perform long-distance imaging.

Images