Implementation and Performance of a New Teleconference System by High Definition Omni-Directional Video Transmission over IP Network

2007 ◽  
Author(s):  
Yosuke Sato ◽  
Yuya Maita ◽  
Koji Hashimoto ◽  
Yoshitaka Shibata
Keyword(s):  
Video Transmission ◽  
High Definition ◽  
Ip Network ◽  
And Performance

scholarly journals A low-cost wireless endoscope camera: a preliminary report

2021 ◽  
Vol 27 (1) ◽  
Author(s):  
J. M. Lazarus ◽  
M. Ncube
Keyword(s):  
Minimally Invasive Surgery ◽  
Minimally Invasive ◽  
Video Transmission ◽  
Low Cost ◽  
Battery Life ◽  
Resource Constrained ◽  
High Definition ◽  
Industry Standard ◽  
Constrained Environments ◽  
The Cost

Abstract Background Technology currently used for surgical endoscopy was developed and is manufactured in high-income economies. The cost of this equipment makes technology transfer to resource constrained environments difficult. We aimed to design an affordable wireless endoscope to aid visualisation during rigid endoscopy and minimally invasive surgery (MIS). The initial prototype aimed to replicate a 4-mm lens used in rigid cystoscopy. Methods Focus was placed on using open-source resources to develop the wireless endoscope to significantly lower the cost and make the device accessible for resource-constrained settings. An off the shelf miniature single-board computer module was used because of its low cost (US$10) and its ability to handle high-definition (720p) video. Open-source Linux software made monitor mode (“hotspot”) wireless video transmission possible. A 1280 × 720 pixel high-definition tube camera was used to generate the video signal. Video is transmitted to a standard laptop computer for display. Bench testing included latency of wireless digital video transmission. Comparison to industry standard wired cameras was made including weight and cost. The battery life was also assessed. Results In comparison with industry standard cystoscope lens, wired camera, video processing unit and light source, the prototype costs substantially less. (US$ 230 vs 28 000). The prototype is light weight (184 g), has no cables tethering and has acceptable battery life (of over 2 h, using a 1200 mAh battery). The camera transmits video wirelessly in near real time with only imperceptible latency of < 200 ms. Image quality is high definition at 30 frames per second. Colour rendering is good, and white balancing is possible. Limitations include the lack of a zoom. Conclusion The novel wireless endoscope camera described here offers equivalent high-definition video at a markedly reduced cost to contemporary industry wired units and could contribute to making minimally invasive surgery possible in resource-constrained environments.

Optimal transmission of high definition video transmission in WiMedia systems

2010 ◽  
Vol 17 (2) ◽  
pp. 291-303 ◽  
Author(s):  
Tung-Yu Wu ◽  
Tzu-Tsung Chuang ◽  
Ching Yao Huang
Keyword(s):  
Video Transmission ◽  
High Definition ◽  
High Definition Video

Wireless video transmission into the MRI magnet room: implementation and evaluation at 1.5T, 3T and 7T

2019 ◽  
Vol 64 (4) ◽  
pp. 373-382
Author(s):  
Bennet Hensen ◽  
Urte Kägebein ◽  
Marcel Gutberlet ◽  
Kristina I. Ringe ◽  
Van Dai Vo-Chieu ◽  
...  
Keyword(s):  
Image Quality ◽  
Video Transmission ◽  
Continuous Wave ◽  
Signal To Noise Ratio ◽  
Noise Spectrum ◽  
Video Stream ◽  
Wireless Video ◽  
High Definition ◽  
Wireless Video Transmission ◽  
Field Strengths

Abstract Purpose To analyze the interference between a wireless high definition multimedia interface (WHDMI) and magnetic resonance imaging (MRI) image quality at 1.5T, 3T and 7T. Materials and methods A wireless video transmission system (WVTS) consisting of a WHDMI and a projector was used to transmit and display a video stream into the magnet room. MR image quality was analyzed at 1.5T, 3T and 7T. Signal-to-noise-ratio $(\overline {{\rm{SNR}}} )$ and radio frequency (RF)-noise spectrum were measured at three transmitter positions (A: inside the cabin, B: in front of the waveguide and C: in the control room). WVTS system functionality tests included measurements of reliability, delay and image quality. Results With the WVTS mean $\overline {{\rm{SNR}}} $ values significantly decreased in comparison to the reference for all positions and fieldstrenghts, while the spectra’s baseline is elevated at 1.5T and 3T. Peaks related to continuous wave interferences are apparent at all field strenghts. For WHDMI alone mean $\overline {{\rm{SNR}}} $ values were stable without significant differences to the reference. No elevation of the spectra’s baseline could be observed. Functionality measurements confirmed high connection reliability with stable image quality and no delays for all field strengths. Conclusion We conclude that wireless transmission of video streams into the MRI magnet room is feasible at all field strengths without hampering image quality.

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