8. Adjusting your Camera

Shutter Speed and Brightness

To achieve good recognition results, it is critical that the camera is adjusted to produce optimal images. This can be done under Settings / Camera:

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If you have constant indoor lighting, it is recommending to set your Shutter Speed to a fixed value (typically 1/30 or 1/15 will produce good results). You can then adjust the ISO setting to obtain a bright and clear face.

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If you have variable lighting and you cannot relocate your iPad, you should set your Shutter Speed to Automatic. You can then adjust the Brightness setting to obtain a bright and clear face.

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Back Light

If you have strong back light (ie: light coming from directly behind people from a nearby window or spotlight) NoahFace will not be able to recognise people because their facial features will not be clear. An extreme example of this is below, with the camera facing directly at a window:

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Even if you adjust the brightness on the image, this will not help, because the contrast will not be sufficient to identify facial features.

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If you have back light issues, the only answers are:

• Change the mounting location. Consider moving the iPad to a new mounting location that is away from windows and does not have strong back lighting.
• Add physical shading. Consider installing permanent window shades, window tinting, or awnings.
• Increase front lighting. Consider putting a spotlight close to the wall above the iPad, which will illuminate faces.

Also make sure you are running a recent model iPad. If you are trying to run NoahFace on an older model iPad, the camera is nowhere near as good at eliminating back light.

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