The projector is an optical instrument that uses optical elements to enlarge the contour of the workpiece and project it onto the screen. It can be used for profile measurement with transmitted light, and can also be used for reflected light to measure the surface shape of non-through holes and observe the surface of parts. The projector is particularly suitable for measuring complex contours and small workpieces, such as watch parts, stamping parts, electronic components, templates, molds, threads, gears and forming tools, etc. It has high inspection efficiency and is easy to use; it is widely used in measurement rooms and production workshops. It is especially suitable for the instrumentation and clock industry.
In today’s society, the use of projectors can be seen everywhere, leisure, shopping, entertainment and education, office places. Projector brands are also blooming everywhere, BenQ, Panasonic, Epson, XGIMI, Optoma. Wait, as a company specializing in the sales of projectors and office equipment in Chongqing, Jinlang Technology, you have to understand the working principle of the projector quite professionally. How does the interactive projection work? Jinlang editor for you answer.
The operating principle of the interactive projection system is to first capture the target image (such as the participant) through the capture device (sensor), and then analyze it by the image analysis system to generate the motion of the captured object. The motion data is combined with the real-time image interactive system , So that the interaction between the participants and the screen is closely integrated.
The light projected by the projector is the visible part, and its infrared part is filtered out by its internal filter, so that the camera cannot see the content projected by the projector. If the infrared is strong, the camera can see the human body. . How to enhance the image of the object seen by the camera? Fortunately, the infrared active emission technology on the market is very mature. For example, the night vision camera sold in the surveillance market can emit near infrared (850 nm) with greater power. There is a special long-distance infrared pair, the night vision camera can reach a distance of 5m, so it is not necessary. The night vision camera actively emits infrared, and then the ccd sensor accepts the infrared, then the difficult part of interactive projection, the segmentation of the human body and the background virtual object is solved, the camera obtains a black and white monochrome background including human images. The next step is to detect the movement of the human body. The image difference technology is used. The difference is to subtract two consecutive frames of images obtained by the camera. Then what is obtained? What is obtained is the moving part, so as long as the person is moving , The difference will intercept the moving part. The next step is to analyze the data, and then project the virtual part. Of course, complex interactive projection is not just these technologies, these are just the basic principles, which also involve camera calibration, optical flow method to find the direction of movement, performance optimization processing, and special effects.