| In many fields such as industrial design,visual technology,and art,2D screens are unable to provide viewers with the spatial information of objects and scenes in 3D space,making it difficult to achieve design expectations or achieve realistic visual effects.Therefore,with the continuous development of display technology,stereoscopic display has become one of the important research directions in the field of display technology,and there is still a lot of room for development in this technology.This paper mainly studies a dualscreen stereoscopic display scheme based on front and back screens to achieve a 3D spatial visual effect.The front display screen uses a transparent LCD screen to display the neardistance scene(foreground),while the back screen is a normal LCD screen that displays the far-distance scene(background)that can be seen through the front screen,forming a depth of field visual effect.The existing near and far truncated planes of the projection transformation in 3D graphics were first utilised to split the foreground background in order to display to the front and back screens respectively,verifying the stereoscopic visual effect.The Windows 3D graphics function library Direct3 D was used and the 3D model was expressed using a mesh created using Direct3D’s COM interface ID3 DXMesh.Different distances of the far and near intercepting planes were chosen to set up the projection transformation matrix to split the3 D virtual scene into foreground and background,which were shown in the stereoscopic display system of the front and rear screens respectively,with the transparent LCD screen showing the foreground and the rear monitor showing the background,and the pixel fill of the foreground and background complementing each other,with the foreground pixels corresponding to the background set to white and transparent,through the front transparent screen to see the background of the rear monitor,to obtain a stereoscopic display of The real sense of reality is obtained by looking at the background of the rear monitor through the front transparent screen,which further generates the visual depth of the front and rear screens.Secondly,this paper also uses line laser scanning to detect actual scenes for imaging experiments on foreground/background separation,connecting the industrial camera to the PC side through a USB adapter cable as the image acquisition end,and taking different colour lasers for different indoor and outdoor scenes respectively.Based on the theory related to the projection algorithm for mapping objects in 3D space to 2D planes,software algorithms were designed on the PC side to separate the foreground and background of the actual scene by converting the depth disparity of the scene into the left and right deviation of the viewing direction through laser scanning illumination,thus distinguishing them in the2 D image.The front and back screen stereoscopic display system constructed in this paper can basically obtain a sense of realism and depth of the stereoscopic display.The significance of the dual screen stereoscopic display system is that it can realise the 3D spatial visualisation of engineering design,examine the design results more intuitively and at the same time apply to visual technology/art products to achieve higher cost performance. |
