{"id":95,"date":"2016-11-16T16:45:14","date_gmt":"2016-11-16T15:45:14","guid":{"rendered":"http:\/\/blog.zhaw.ch\/high-performance\/?p=95"},"modified":"2016-11-16T16:45:14","modified_gmt":"2016-11-16T15:45:14","slug":"low-latency-highly-reliable-wireless-video-transmission-to-ipad","status":"publish","type":"post","link":"https:\/\/blog.zhaw.ch\/high-performance\/2016\/11\/16\/low-latency-highly-reliable-wireless-video-transmission-to-ipad\/","title":{"rendered":"Low Latency, Highly Reliable Wireless Video Transmission to iPad"},"content":{"rendered":"<p><strong>Institute of Embedded Systems, a research institute of Zurich University of Applied Sciences generated a reference design for a low latency, highly reliable wireless video transmission from a battery operated camera to an iPad or iPhone. The design is suitable for everything that requires a robust low latency video link such as vehicle remote control, industrial applications, automotive applications and others. Since the transmission is Wi-Fi based, no extra hardware to receive the video stream on an iPad or iPhone is required.<br \/>\nThe camera module consists of an Intel SoC-FPGA with integrated single core ARM-A9 with flexible interface to various types of cameras and SDIO interface to the Wi-Fi module. Optional LCD interfaces or an SD-card slot allow monitoring and recording of the video at the camera module.<\/strong><\/p>\n<p><img loading=\"lazy\" decoding=\"async\" class=\"aligncenter wp-image-98 size-full\" src=\"http:\/\/blog.zhaw.ch\/high-performance\/files\/2016\/11\/low_latency_camera_half.png\" alt=\"low_latency_camera_half\" width=\"960\" height=\"540\" srcset=\"https:\/\/blog.zhaw.ch\/high-performance\/files\/2016\/11\/low_latency_camera_half.png 960w, https:\/\/blog.zhaw.ch\/high-performance\/files\/2016\/11\/low_latency_camera_half-300x169.png 300w, https:\/\/blog.zhaw.ch\/high-performance\/files\/2016\/11\/low_latency_camera_half-768x432.png 768w, https:\/\/blog.zhaw.ch\/high-performance\/files\/2016\/11\/low_latency_camera_half-676x380.png 676w\" sizes=\"auto, (max-width: 960px) 100vw, 960px\" \/><\/p>\n<p>The low latency video compression algorithm is nearly lossless and always transmits full frames. While the compression is implemented in the FPGA fabric, control is accomplished by a Linux operating system in the ARM-A9.<br \/>\nError correction avoids pixel and frame drops even if Wi-Fi transmission is problematic, like in busy areas or in difficult topography. The Wi-Fi standard includes automatic retransmission of lost packets. However, there still remains a chance that packets are lost. To increase reliability even further, we add redundant packets. This slightly increases the bandwidth however does not add significant latency.<br \/>\nTo receive the video stream, it is enough to install a viewer app, no extra hardware is required. Video decompression and error correction are solely handled in the GPU and the CPU of the iPad.<br \/>\nThe FPGA IP requires only 2.9k logic cells, which is 18% of a 15k logic cell Intel Cyclone-V SoC.<br \/>\nThe transmitter IP controls an 802.11n Wi-Fi module like the Texas Instruments WL1835MOD, however other TI modules are supported as well.<br \/>\nThe measured glass to glass latency can be as low as 65 ms (2 video frames at 30 fps). However, dependent on the selected compression rate and the Wi-Fi channel quality, the latency might be higher.<br \/>\nFor more information, contact Tobias.Welti@zhaw.ch<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Institute of Embedded Systems, a research institute of Zurich University of Applied Sciences generated a reference design for a low latency, highly reliable wireless video transmission from a battery operated camera to an iPad or iPhone. The design is suitable for everything that requires a robust low latency video link such as vehicle remote control, [&hellip;]<\/p>\n","protected":false},"author":271,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"ngg_post_thumbnail":0,"footnotes":""},"categories":[1],"tags":[],"features":[],"class_list":["post-95","post","type-post","status-publish","format-standard","hentry","category-allgemein"],"yoast_head":"<!-- This site is optimized with the Yoast SEO Premium plugin v27.2 (Yoast SEO v27.2) - https:\/\/yoast.com\/product\/yoast-seo-premium-wordpress\/ -->\n<title>Low Latency, Highly Reliable Wireless Video Transmission to iPad - Embedded High Performance Multimedia Blog<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/blog.zhaw.ch\/high-performance\/2016\/11\/16\/low-latency-highly-reliable-wireless-video-transmission-to-ipad\/\" \/>\n<meta property=\"og:locale\" content=\"en_GB\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Low Latency, Highly Reliable Wireless Video Transmission to iPad\" \/>\n<meta property=\"og:description\" content=\"Institute of Embedded Systems, a research institute of Zurich University of Applied Sciences generated a reference design for a low latency, highly reliable wireless video transmission from a battery operated camera to an iPad or iPhone. The design is suitable for everything that requires a robust low latency video link such as vehicle remote control, [&hellip;]\" \/>\n<meta property=\"og:url\" content=\"https:\/\/blog.zhaw.ch\/high-performance\/2016\/11\/16\/low-latency-highly-reliable-wireless-video-transmission-to-ipad\/\" \/>\n<meta property=\"og:site_name\" content=\"Embedded High Performance Multimedia Blog\" \/>\n<meta property=\"article:published_time\" content=\"2016-11-16T15:45:14+00:00\" \/>\n<meta property=\"og:image\" content=\"http:\/\/blog.zhaw.ch\/high-performance\/files\/2016\/11\/low_latency_camera_half.png\" \/>\n<meta name=\"author\" content=\"gelk\" \/>\n<meta name=\"twitter:card\" content=\"summary_large_image\" \/>\n<meta name=\"twitter:label1\" content=\"Written by\" \/>\n\t<meta name=\"twitter:data1\" content=\"gelk\" \/>\n\t<meta name=\"twitter:label2\" content=\"Estimated reading time\" \/>\n\t<meta name=\"twitter:data2\" content=\"2 minutes\" \/>\n<script type=\"application\/ld+json\" class=\"yoast-schema-graph\">{\"@context\":\"https:\/\/schema.org\",\"@graph\":[{\"@type\":\"Article\",\"@id\":\"https:\/\/blog.zhaw.ch\/high-performance\/2016\/11\/16\/low-latency-highly-reliable-wireless-video-transmission-to-ipad\/#article\",\"isPartOf\":{\"@id\":\"https:\/\/blog.zhaw.ch\/high-performance\/2016\/11\/16\/low-latency-highly-reliable-wireless-video-transmission-to-ipad\/\"},\"author\":{\"name\":\"gelk\",\"@id\":\"https:\/\/blog.zhaw.ch\/high-performance\/#\/schema\/person\/f4fab1587a03110cf79f1bf51f32ebfa\"},\"headline\":\"Low Latency, Highly Reliable Wireless Video Transmission to iPad\",\"datePublished\":\"2016-11-16T15:45:14+00:00\",\"mainEntityOfPage\":{\"@id\":\"https:\/\/blog.zhaw.ch\/high-performance\/2016\/11\/16\/low-latency-highly-reliable-wireless-video-transmission-to-ipad\/\"},\"wordCount\":347,\"commentCount\":0,\"image\":{\"@id\":\"https:\/\/blog.zhaw.ch\/high-performance\/2016\/11\/16\/low-latency-highly-reliable-wireless-video-transmission-to-ipad\/#primaryimage\"},\"thumbnailUrl\":\"http:\/\/blog.zhaw.ch\/high-performance\/files\/2016\/11\/low_latency_camera_half.png\",\"articleSection\":[\"Allgemein\"],\"inLanguage\":\"en-GB\",\"potentialAction\":[{\"@type\":\"CommentAction\",\"name\":\"Comment\",\"target\":[\"https:\/\/blog.zhaw.ch\/high-performance\/2016\/11\/16\/low-latency-highly-reliable-wireless-video-transmission-to-ipad\/#respond\"]}]},{\"@type\":\"WebPage\",\"@id\":\"https:\/\/blog.zhaw.ch\/high-performance\/2016\/11\/16\/low-latency-highly-reliable-wireless-video-transmission-to-ipad\/\",\"url\":\"https:\/\/blog.zhaw.ch\/high-performance\/2016\/11\/16\/low-latency-highly-reliable-wireless-video-transmission-to-ipad\/\",\"name\":\"Low Latency, Highly Reliable Wireless Video Transmission to iPad - 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