<transcript><audio_153>infrared spectrum so that the actor or artist who's moving around in these motion capture studios does not feel the interference or is not blinded by the lights so you can make these</transcript><video><caption><image_154>The image shows a man standing in front of a green chalkboard. He is wearing a blue t-shirt with a red and yellow logo on it. He has short dark hair and is holding a piece of paper in his right hand. He appears to be giving a presentation or explaining something, as he is gesturing with his left hand and is looking directly at the camera with a serious expression.</caption><caption><image_155>The image shows a man standing in front of a green chalkboard. He is wearing a blue t-shirt with a yellow logo on it and is holding a white folder in his right hand. He appears to be giving a presentation or explaining something, as he is gesturing with his left hand as if he is explaining something. The man has short dark hair and is looking directly at the camera with a serious expression.</caption><caption><image_156>The image shows a young man standing in front of a green chalkboard. He is wearing a blue t-shirt with a yellow logo on it and is holding a piece of paper in his left hand. He appears to be speaking or giving a presentation. The man has short dark hair and is looking off to the side with a serious expression on his face.</caption><caption><image_157>The image shows a man standing in front of a green chalkboard. He is wearing a blue t-shirt and appears to be in a classroom or a classroom setting. The man is holding a piece of paper in his left hand and is looking towards the right side of the image. The chalkboard is blank, with no writing or illustrations on it. The image is taken from a low angle, with the man's shadow cast on the chalkboard in the background.</caption></video><transcript><audio_158>infrared leds so just exploit the fact that we can't see in that range and then you put the features</transcript><video><caption><image_159>The image shows a man standing in front of a green chalkboard. He is wearing a blue t-shirt and appears to be writing on the chalkboard with a marker. On the left side of the image, there is a whiteboard with various mathematical equations and diagrams written on it. The equations are written in black chalk and appear to be related to physics or chemistry. The man is standing with his back to the camera, and his hands are resting on his knees. The background is blurred, but it seems like he is in a classroom or a classroom setting.</caption><caption><image_160>The image shows a young man standing in front of a green chalkboard. He is wearing a blue t-shirt with a logo on it and is holding a piece of paper in his hand. On the chalkboard, there are various mathematical equations and formulas written in white chalk. The equations appear to be related to physics or mathematics. The man is looking at the camera with a serious expression on his face.</caption><caption><image_161>The image shows a green chalkboard with a person standing in front of it. The person is wearing a blue t-shirt and appears to be a teacher or a student. On the chalkboard, there are various mathematical equations written in white chalk. The equations are written in a neat and organized manner, with some of them overlapping each other. The background of the image is blurred, but it seems like the person is standing in a classroom or a classroom setting.</caption></video><transcript><audio_162>which are called retroreflective markers retro reflective markers you can buy special paint and you can</transcript><transcript><audio_163>paint tiny objects you may have seen what look like deer antlers sticking out of objects before in these kinds of systems and you have gray tiny painted spheres this is retroreflective paint what will</transcript><transcript><audio_164>happen is that the amount of light coming back to the source so if i shine a light an ir light onto the source and then i look at the reflected light back it will be independent of the angle at which the light hits this object so there will tend to be a very bright spot</transcript><caption><image_165>The image shows a young man standing in front of a green chalkboard. He is wearing a blue t-shirt and khaki pants and is holding a white folder in his left hand. He appears to be in a classroom or a lecture hall, as there is a blackboard on the left side of the image and a projector screen on the right side. The man is pointing to the chalkboard with his right hand and has a serious expression on his face. On the chalk board, there are various mathematical equations and formulas written in white chalk.</caption><transcript><audio_166>coming back so very nice for that so that's retro reflective it's as if you're shining into a mirror regardless of the orientation which is a very unusual property right normal if you want to have the light bounce back in you have to have the mirror perfectly aligned this is as if you have all orientations of mirrors</transcript> infrared spectrum so that the actor or artist who's moving around in these motion capture studios does not feel the interference or is not blinded by the lights so you can make these infrared leds so just exploit the fact that we can't see in that range and then you put the features which are called retroreflective markers retro reflective markers you can buy special paint and you can paint tiny objects you may have seen what look like deer antlers sticking out of objects before in these kinds of systems and you have gray tiny painted spheres this is retroreflective paint what will happen is that the amount of light coming back to the source so if i shine a light an ir light onto the source and then i look at the reflected light back it will be independent of the angle at which the light hits this object so there will tend to be a very bright spot coming back so very nice for that so that's retro reflective it's as if you're shining into a mirror regardless of the orientation which is a very unusual property right normal if you want to have the light bounce back in you have to have the mirror perfectly aligned this is as if you have all orientations of mirrors
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