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Using image rotation to optimise coverage and bandwidth usage

March 8th, 2017 by Nathan Mount

Demonstrating how rotating the image is beneficial

When choosing a camera for video surveillance in narrow scenes such as long corridors, staircases, aisles and tunnels, the traditional landscape-oriented setup may not be the optimal choice. If you’re monitoring a narrow corridor or passageway, a sizeable portion of the scene is going to be walls either side, making a lot of your image redundant. The full area and resolution of the camera’s image sensor is not being fully utilised and this means that evidence of events occurring outside this limited area of coverage may be missed. These redundant sections either side of the image also consume bandwidth and storage that could really be put to better use.

This is where the ability to rotate the image proves to be very handy. This feature allows you to obtain a portrait-oriented video stream – effectively turning an HD camera’s 16:9 aspect ratio to a 9:16 aspect ratio. By filming in this orientation, you are ensuring that the whole sensor covers the area of interest, maximising coverage and eliminating bandwidth and storage waste.

Let’s take a look at the difference image rotation would make in this typical corridor scene.

Traditional landscape camera view Camera using image rotation

You can see why this technique is often used in locations such as the corridors of schools and colleges, warehouse aisles, office stairwells and even access roads on large manufacturing sites.

Most IP camera manufacturers provide this feature – the terminology varies (Corridor Format, Corridor View, Rotate Mode and Upright View) but they’re all designed to do the same thing. Image rotation can be achieved in a few different ways:

  • During installation the camera body can be physically rotated and then the image is rotated 90° (or 270°) using the camera’s configuration settings
  • Alternatively, some models can rotate the lens / sensor unit itself after it is mounted
  • Other models will simply crop the image digitally (the two methods above produce better quality results)

Now you’re aware of the advantages of image rotation, you can bear this feature in mind when choosing your next IP CCTV camera. To make the process even easier, we’ve put together a list of popular network cameras where image rotation is included the feature set.

We’ve included models in a wide price range, starting with an affordable mini-dome right up to an advanced, multi-sensor dome. Additional features vary by camera but all models will deliver vertically-oriented video to help you monitor tall and narrow scenes more effectively.

Axis M3045-V: indoor vandal-resistant mini-dome

AAxis M3045-V indoor vandal-resistant mini-dome IP camera

This best selling model provides HD 1080p resolution at up to 25fps with a 106° field of view. With a compact IK08-rated vandal-resistant casing (it’s about the size of your palm) this camera is a perfect option for unobtrusive monitoring in areas that can be prone to tampering.

More details for the Axis M3045-V

Sony SNC-XM637: outdoor mini-dome IP camera with HD 1080p

Sony SNC-XM637 outdoor mini dome IP camera

This compact outdoor mini-dome IP camera delivers HD 1080p resolution images with a 113° wide viewing angle. The SNC-XM637 features a host of intelligent video analytics such as removed object detection, face and intrusion detection.

More details for the Sony SNC-XM637

Bosch DINION IP 4000: outdoor bullet with 30m night vision

Bosch DINION IP 4000 outdoor bullet with 30m IR

An HD outdoor-ready bullet from Bosch that has a varifocal lens, built-in IR LEDs for up to 30m of night vision, and an IK08-rated aluminium housing. This robust model also includes imaging technologies such as intelligent defog and noise reduction for improved image clarity.

More details for the Bosch DINION IP 4000

Axis M3106-LVE: outdoor mini-dome with 15m night vision

Axis M3106-LVE outdoor mini-dome IP camera

This robust mini-dome from Axis produces 4MP resolution images at up to 25 frames per second (fps) for clear, smooth footage. Its innovative flat-faced design will help to reduce light reflections, improving image capture in low light.

More details for the Axis M3106-LVE

Sony SNC-EB630: indoor fixed network camera with full HD 1080p

Sony SNC-EB630 IP camera

The Sony SNC-EB630 includes a variety of advanced image technologies such as View-DR wide dynamic range, which improves image quality in high-contrast scenes, and image stabilisation which ensures images remain clear in the event of camera movement.

More details for the Sony SNC-EB630

Hikvision DS-2CD4A65F-IZS: outdoor IP camera with 6MP resolution

Hikvision DS-2CD4A65F-IZS outdoor IP camera

This outdoor IP camera can produce 6MP resolution at up to 24 frames per second. Infrared (IR) night vision is enhanced using an IR anti-reflection panel which increases IR light transmittance, and Smart IR to provide a clearer long-range image at night (up to 50m).

More details for the Hikvision DS-2CD4A65F-IZS

Hikvision DS-2CD4185F-IZ: indoor vandal-resistant 4K dome IP camera

Hikvision DS-2CD4185F-IZ 4MP IP Camera

This vandal-resistant unit is capable of delivering 4K resolution and includes imaging technologies such as digital wide dynamic range (DWDR), smart IR and 3D noise reduction for improved image quality in challenging light conditions.

More details for the Hikvision DS-2CD4185F-IZ

Bosch DINION IP Starlight 7000: high sensitivity indoor IP camera

Bosch DINION IP Starlight 7000 indoor IP camera

Producing HD 720p video at up to 60 fps, this model can capture full colour images in near-darkness, using Bosch’s Starlight technology. Built-in Intelligent Video Analytics enhance security monitoring and situational awareness with a range of configurable alarms.

More details for the Bosch DINION IP Starlight 7000

Axis P1428-E: 4K outdoor bullet with digital autotracking

Axis P1428-E 4K outdoor bullet IP camera

An outdoor bullet IP camera that delivers 4K ultra-HD resolution, including Axis’ digital autotracking technology which automatically detects, zooms in (with 3x optical zoom) and follows moving objects for precise surveillance.

More details for the Axis P1428-E

Axis P3707-PE: outdoor IP camera with four HD 1080p sensors

Axis P3707-PE multi-sensor IP camera

This versatile and robust outdoor IP camera consists of four varifocal camera heads to provide all-round coverage. Each HD sensor is fitted onto a circular track and can be moved +/-90° for optimum positioning. It’s an ideal choice for use at intersections on corridors, aisles or roads.

More details for the Axis P3707-PE

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