<transcript><audio_177>on a headset then i have to power these lights so that's another alternative that's what's used in the lab and instead of having retroreflective</transcript><video><caption><image_178>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. The chalkboard has various mathematical equations and formulas written on it in white chalk. The man is standing with his back to the camera, facing away from the camera and his head tilted slightly to the side. The background is blurred, but it seems to be a classroom or a classroom setting.</caption><caption><image_179>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 white chalk. The chalkboard is covered in green chalk and there is a whiteboard at the top of the image. The man is holding a white marker in his right hand and is writing on it with his left hand. The background is a plain white wall.</caption></video><transcript><audio_180>i have these special markers that i've designed and these are just infrared leds and we're also taking advantage of the fact of leds becoming increasingly more powerful and low cost</transcript><transcript><audio_181>and and very compact as well earlier leds were larger they had a huge lens across them so you could see them looking bright from different angles now they emit a much greater amount of light infrared light in this case very low cost very small footprint</transcript><transcript><audio_182>so now it's essentially if you want to set up this visibility situation and think about the amount of polities leds have to have you've cut it in half in order to be able to see them in the image with the same in the same way and also there's the efficiency of the retro-reflective material which i haven't covered as well</transcript><caption><image_183>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 pointing towards the chalkboard with his right hand, as if he is explaining something. The chalkboard is blank and there is a shadow of a person on it. The image is taken from a low angle, so the man is not visible in the frame.</caption> on a headset then i have to power these lights so that's another alternative that's what's used in the lab and instead of having retroreflective i have these special markers that i've designed and these are just infrared leds and we're also taking advantage of the fact of leds becoming increasingly more powerful and low cost and and very compact as well earlier leds were larger they had a huge lens across them so you could see them looking bright from different angles now they emit a much greater amount of light infrared light in this case very low cost very small footprint so now it's essentially if you want to set up this visibility situation and think about the amount of polities leds have to have you've cut it in half in order to be able to see them in the image with the same in the same way and also there's the efficiency of the retro-reflective material which i haven't covered as well
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