IDOL 24.1

# Configure Object Recognition for Best Results

To ensure the most accurate object recognition, you can set several parameters in the configuration file.

## Perspective Effects

You can set the `Perspective` parameter to specify whether the object might appear at an angle, introducing perspective effects or ‘skew’ to the image. The `Perspective` parameter defaults to `True`, specifying that the object might be viewed at an angle. This default setting is the most generally applicable, and is normally the correct setting when the object is being viewed through a camera (for example, the board of sponsors’ logos that often appears in post-match interviews at sports events). However, for certain applications a 2-D geometry is more appropriate; for example, to detect a printed logo in a text document or scanned picture, or a broadcaster’s logo overlaid onto a video stream. For these cases, you can achieve much better false positive rates by setting `Perspective` to `False`. Media Server still allows for scaling, translation, and rotation in the plane, but does not allow tilting of the camera axis.

Going into more detail, `Perspective=True` implies a homography between the image and the model, which allows for arbitrary focal length and pixel aspect ratio but does require the camera to behave approximately as a pinhole camera (the small distortions present in most cameras should not usually cause a problem). Setting `Perspective` to `False` implies a similarity transform.

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Version 24.1 | Last updated December 2023

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Product: IDOL 24.1

Topic Title: Configure Object Recognition for Best Results