OLT-Interactive Laser System Description
OLT utilizes the latest deep camera technology, with the standard version camera recommended for detection at a distance of 5 meters. Due to the suspension setup, the laser is typically suspended within 6 meters, taking into account the average human height. In addition to the previous tracking effects such as rectangles, rotated rectangles, Circle , Convex Hull, approximate polygon, and text, the latest version has added line effects, such as the automatic laser gate effect for head graphics.
System Introduction:
The hardware composition of this interactive system is quite simple. A depth camera is used to detect the position information of people. The OLT software processes the camera’s images and performs real-time calculations for laser effects. The laser signal is output to the laser fixture through the laserdock box, and the OLT software also supports direct output of the laser signal to the BEYOND software.
When actually installing, it is best to choose a mini PC so that all the hardware can be put together, which also avoids the trouble of long-distance wiring. Of course, when debugging, you still need to connect a display, which requires a long-distance HDMI cable. Mouse and keyboard can all use wireless devices. The suggestion for the computer configuration should not be too inferior.
When actually installing, ensure that the front panel of the camera is aligned with the body of the laser fixture, and the center of the camera is aligned vertically with the outlet of the laser fixture. The camera should be as close as possible to the outlet and be firmly fixed.
Features:
The software is roughly divided into three parts: the left side is for camera-related settings, debugging parameters, and preview images. The middle section is for tracking effect settings, and the right side is for laser setting parameters and previews.
1. In the camera settings, when a camera is correctly connected, you can activate the camera image by clicking on the camera active button. If the camera is not correctly connected, this button cannot be activated normally. When the Auto Exposure button is turned on, the exposure and gain sliders below it cannot be adjusted. In situations where the laser fixture is suspended at a high height and the desired detection distance is greater than what the auto exposure can achieve, manual adjustment of exposure and gain can be used to meet this need.
In the general settings, the “Capture” button can be used to take a base image when there is no subject in the frame, which is useful for tracking calculations in complex environments, focusing only on moving objects. For example, if there are clearly detectable stationary objects in the camera image during a blank capture, this image can be captured and compared with the image when there are people present to perform comparative calculations. If you have previously captured a blank image, you can click the “Reset Image” button to reset this base image to a blank state.
The “ImgSize-Image Size” option can be used to zoom in and out the camera’s image. Since the actual field of view (FOV) of the camera in use is 66 degrees, which is slightly larger than the 60-degree angle of the laser fixture, the camera image can be appropriately enlarged to better match the two images.
The “MapFac-Mapping Factor” option is used when the laser fixture is suspended too close to the ground, typically requiring a distance of more than 3 meters. If it’s less than 3 meters, it can cause significant deviation between the laser fixture image and the tracking position when people are near the edge of the image. In such cases, adjusting the mapping Factor can help with alignment. The default value is 1, ensuring that the camera and laser images are perfectly aligned.
The “X-offset” and “Y-offset” options are for correcting any misalignment between the camera and laser images due to installation errors. If the camera is accurately aligned with the laser fixture outlet vertically, the X-axis offset can remain at the default value of 0. When adjusting the Y-axis offset, ensure that the image size has been adjusted so that the widths of the laser and camera images are consistent, and then use the Y-axis offset to align the two images vertically.
If the camera is positioned farther from the laser light outlet, you might need to adjust the tilt correction(TiltCorr) option to better match the two images.
The “LowCut” option is for excluding the area below the ground, focusing on detecting moving objects above ground level. The “Filter” is for filtering within a certain time frames to enhance image stability. Increasing this value will increase image latency, and setting it to 1 will cause the image to fill in the effect. For effects that are based on real-time detection of object size (such as approximate polygon, ConvexHull, etc.), a setting of around 0.7 is usually recommended for improved stability.
The “DnSize-DenoiseSize” option is for edge noise reduction in the depth image; avoid setting this value too high.
The “Blur” option is another noise reduction method, adjust as needed, but don’t set this value too high either.
Below these settings is the camera’s depth image preview, allowing you to view the depth image and processing effects in real time.
The Rectangle style calculates the position and size of the tracking object based on the real-time camera image, and you can also view the calculation results in the camera’s real-time preview. This rectangle does not rotate.
![](https://i0.wp.com/www.r1gy.com/wp-content/uploads/2024/07/1721535995627.png?resize=427%2C716&ssl=1)
The Approximate Polygon style resamples the blocks in the real-time image to generate polygons with the set PolygonSample value.
![](https://i0.wp.com/www.r1gy.com/wp-content/uploads/2024/07/1721535933138.png?resize=424%2C723&ssl=1)
Summary:
This system is designed for interaction with a single laser device. If you need to arrange multiple lasers in a channel for interaction, customization can be made as required.
1 thoughts on “OLT-Interactive Laser System Description”
Version 2.0
Added a preset access system that automatically loads the first preset upon startup. You can click to select and load the corresponding preset parameters, and after making modifications, click ‘Save’ to overwrite the corresponding preset. These presets correspond to the respective DATA1-6.olt files in the presets folder. Additionally, two anti-tracking effects have been added, which are the wave and poly anti-tracking effects. The wave anti-tracking effect includes three types of waveforms: sine wave, triangle wave, and noise wave. The placement of the laser is not limited to suspension; it can also be placed flat. Furthermore, the entire UI has been adjusted to be suitable for remote control via an iPad.
Comments are closed.