Thesis - Audio detection for preparation of video Rate-Controller

Job Title
Thesis - Audio detection for preparation of video Rate-Controller

Job Description

Category
Computer Science / Signal Processing / Encoding

Scope
2 students completing 30 credits (20 weeks) each

Background

The problem with real-time video encoding is that it is not known what size a frame will be, until the frame has been encoded, making it difficult to adopt to rapid changes. A typical surveillance scene is very static, which results in low compression rates in order to capture the static parts in great quality. Sudden changes in the scene causes large amounts of it to be encoded. Too much change in a frame and the bitrate becomes too high for transmission, resulting in a dropped frame.

A video stream normally has 30 frames per second, i.e. 33ms between frames.

Audio however, is sampled at a much higher rates, commonly at 44.1 kHz.

There are algorithms such as Gaussian Mixture Modelling(GMM), that can be used on audio data against a model to detect and trigger on anomalies in the sound environment. Since audio data is sampled at a much higher rate than video, audio could be used to inform the Rate-Controller about a sudden change imminent in the scene. This information can be used in the Rate-Controller to prevent a spike in the bitrate, avoiding a dropped frame.

Goal

Investigate/develop a system for using audio anomaly detection to inform the Rate-Controller

Use the information inside the Rate-Controller to adjust the encoding parameters. This would ideally lead to less dropped frames in a suddenly changing scene, and less bitrate overshoot.

Implement a prototype on an Axis camera if time allows.

Who are you?

For this Thesis proposal we target students with a strong interest in Signal Processing and algorithms. Most likely you are studying a Master Program in Computer Science or mathematics.

OK, I am interested! What do I do now?
You are valuable to us – how nice that you are interested in one of our proposals! There are a few things for you to keep in mind when applying.

  • Applications are accepted in both Swedish and English, and you apply via the proposal advert.
  • The announced thesis is open only to students affiliated with a Swedish University/College either directly or via an exchange program.
  • When the thesis proposal states that it includes two students working together, we would like you to apply in pairs. In these cases, send one application each but make sure to clearly state in your application who your co-applicant is. If you have any questions regarding this, please do not hesitate to contact us.
  • Please attach your CV and University/College grade summary.

Who to contact for any questions regarding the position!

Magnus Söderdahl, Engineering Manager

+46 46 272 18 00, magnus.soderdahl@axis.com

Type of Employment
Temporary Employment (Fixed Term)

Posting End Date
2020-12-08

About Axis Communications
Axis enables a smarter and safer world by creating network solutions that provide insights for improving security and new ways of doing business. As the industry leader in network video, Axis offers products and services for video surveillance and analytics, access control, and audio systems. Axis has more than 3,000 dedicated employees in over 50 countries and collaborates with partners worldwide to deliver customer solutions. Axis celebrates diversity and is committed to creating an inclusive environment for all employees.

For more information about Axis, please visit our website www.axis.com.


Företag

Axis Communications

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Sista ansökningsdag

2020-12-08


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