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-# Guidelines for Reference Images
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+# Guidelines for Images
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-Some images are more suitable for tracking than others. For best results, pick images that are distinct, asymmetric and detailed. Let me show you some examples.
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+Not all images are suitable for tracking. For best results, pick images that are distinct, asymmetric, detailed and that have little or no text.
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## Distinct
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A distinct image has distinguishable areas - quite unlike a repetitive pattern!
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-| Distinct :heavy_check_mark: | Not distinct :x: |
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-| --------------------------- | ---------------- |
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-| [](./img/guidelines-for-images-10.jpg){ ._blank } | [](./img/guidelines-for-images-1.jpg){ ._blank } |
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-| [](./img/guidelines-for-images-9.jpg){ ._blank } | [](./img/guidelines-for-images-4.jpg){ ._blank } |
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+| Suitable :heavy_check_mark: | Unsuitable :x: |
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+| --------------------------- | -------------- |
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+| [](./img/guidelines-for-images-10.jpg){ ._blank } | [](./img/guidelines-for-images-1.jpg){ ._blank } |
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+| [](./img/guidelines-for-images-9.jpg){ ._blank } | [](./img/guidelines-for-images-4.jpg){ ._blank } |
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## Asymmetric
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Asymmetric images help the engine determine their orientation. When evaluating symmetry, you must not take colors into account.
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-| Asymmetric :heavy_check_mark: | Symmetric :x: |
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-| ----------------------------- | ------------- |
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-| [](./img/guidelines-for-images-12.jpg){ ._blank } | [](./img/guidelines-for-images-2.jpg){ ._blank } |
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-| [](./img/guidelines-for-images-11.jpg){ ._blank } | [](./img/guidelines-for-images-5.jpg){ ._blank } |
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+| Suitable :heavy_check_mark: | Unsuitable :x: |
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+| --------------------------- | -------------- |
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+| [](./img/guidelines-for-images-12.jpg){ ._blank } | [](./img/guidelines-for-images-2.jpg){ ._blank } |
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+| [](./img/guidelines-for-images-11.jpg){ ._blank } | [](./img/guidelines-for-images-5.jpg){ ._blank } |
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## Detailed
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-A detailed image has lots of details with sufficient contrast. There's not much blank space!
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+A detailed image has lots of different details with sufficient contrast. There isn't much blank space!
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-| Detailed :heavy_check_mark: | Not detailed :x: |
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-| ---------------------------------- | ----------------------- |
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-| [](./img/guidelines-for-images-3.jpg){ ._blank } | [](./img/guidelines-for-images-7.jpg){ ._blank } |
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-| [](./img/guidelines-for-images-8.jpg){ ._blank } | [](./img/guidelines-for-images-6.jpg){ ._blank } |
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+| Suitable :heavy_check_mark: | Unsuitable :x: |
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+| --------------------------- | -------------- |
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+| [](./img/guidelines-for-images-3.jpg){ ._blank } | [](./img/guidelines-for-images-7.jpg){ ._blank } |
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+| [](./img/guidelines-for-images-8.jpg){ ._blank } | [](./img/guidelines-for-images-6.jpg){ ._blank } |
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+## Little or no text
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+It follows from the other recommendations that images with too much text - particularly small text - are unsuitable for tracking. Feature points will tend to cluster around the letters and will not be distinct enough. A little bit of text is okay.
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+| Suitable :heavy_check_mark: | Unsuitable :x: |
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+| --------------------------- | -------------- |
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+| [](./img/guidelines-for-images-14.jpg){ ._blank } | [](./img/guidelines-for-images-13.jpg){ ._blank } |
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+| [](./img/guidelines-for-images-16.jpg){ ._blank } | [](./img/guidelines-for-images-15.png){ ._blank } |
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## Other considerations
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alemart
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