wiki:v2:some_tips_on_generating_color_signatures_2
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wiki:v2:some_tips_on_generating_color_signatures_2 [2018/05/23 22:27] pixycam |
wiki:v2:some_tips_on_generating_color_signatures_2 [2018/05/28 20:48] jfrench minor edit |
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| Like a camera, Pixy2 needs to get the correct exposure setting or its images won't contain enough dynamic range, and detection accuracy will suffer. PixyMon has a feature that highlights regions of the image that are overexposed. You can enable it by clicking on the box next to **Highlight overexposure** in the **PixyMon Parameters** tab (see below). | Like a camera, Pixy2 needs to get the correct exposure setting or its images won't contain enough dynamic range, and detection accuracy will suffer. PixyMon has a feature that highlights regions of the image that are overexposed. You can enable it by clicking on the box next to **Highlight overexposure** in the **PixyMon Parameters** tab (see below). | ||
| - | {{wiki:img:6e0753847f2cb647409312f25cd109d4743c54c7.jpg?400}} | + | {{wiki:v2:image_218.png}} |
| When this is enabled, overexposed parts of the image will be highlighted as black, as shown below: | When this is enabled, overexposed parts of the image will be highlighted as black, as shown below: | ||
| - | {{wiki:img:d777a70b0e3c2e701f27e1a54293a89e8b4bb638.jpg?400}} | + | {{wiki:v2:image_217.png}} |
| We highly recommend enabling overexposure highlighting, because if the object you want to detect is overexposed, detection accuracy will suffer. So, after enabling overexposure highlighting, go to the **Tuning** tab in **Pixy Parameters** and choose a good setting for **Camera Brightness** by adjusting the slider (see below). | We highly recommend enabling overexposure highlighting, because if the object you want to detect is overexposed, detection accuracy will suffer. So, after enabling overexposure highlighting, go to the **Tuning** tab in **Pixy Parameters** and choose a good setting for **Camera Brightness** by adjusting the slider (see below). | ||
| - | {{wiki:img:65a67a4cd1aa9fe49575f34a0dd638aec24d8afb.jpg?400}} | + | {{wiki:v2:image_221.png}} |
| - | A good exposure setting leaves almost all of the pixels in your object correctly exposed, but not too dark (underexposed). It's OK for small parts of your object to be overexposed, especially if your object is shiny. See the picture below -- note that a small part of the object (yellow ball) has a black region indicating overexposure. This is fine. | + | A good exposure setting leaves almost all of the pixels in your object correctly exposed, but not too dark (underexposed). It's OK for small parts of your object to be overexposed, especially if your object is shiny. See the picture below -- note that a small part of the object (red ball) has a black region indicating overexposure. This is fine. |
| - | {{wiki:img:540b3dabc96bcaf5cb1856b09e419a4e832a29bc.jpg?400}} | + | {{wiki:v2:image_220.png}} |
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| ==== Adjust the signature teach threshold ==== | ==== Adjust the signature teach threshold ==== | ||
| - | One of Pixy2's goals is to be able to easily learn different objects without needing to hook it up to a computer. The button-press teaching method allows you to do this. But for certain objects and/or lighting conditions, the button-press method might need some adjusting. The **Signature teach threshold** setting in the **Expert** tab allows you to adjust how inclusive Pixy2 is when determining which pixels are part of the object during teaching. You can adjust the **Signature teach threshold** while Pixy2 is in teach mode, so you can get "live" feedback while choosing a good threshold. The video below shows the **Signature teach threshold** in action. | + | One of Pixy2's goals is to be able to easily learn different objects without needing to hook it up to a computer. The button-press teaching method allows you to do this. But for certain objects and/or lighting conditions, the button-press method might need some adjusting. The **Signature teach threshold** setting in the **Expert** tab allows you to adjust how inclusive Pixy2 is when determining which pixels are part of the object during teaching. You can adjust the **Signature teach threshold** while Pixy2 is in teach mode, so you can get "live" feedback while choosing a good threshold. |
| - | {{youtube>tJ7CZfvsbz8?480x360)}} | + | {{wiki:v2:image_230.png}} |
| - | {{wiki:img:96850007a4625a986b35498b8eb11450232fb235.jpg?400}} | + | The picture below is an example of a threshold that is too inclusive. Note the regions that are not part of the green duck (the intended object). In this case, you should reduce the threshold. |
| - | The picture below is an example of a threshold that is too inclusive. Note the regions that are not part of the purple dinosaur (the intended object). In this case, you should reduce the threshold. | + | {{wiki:v2:image_235.png}} |
| - | {{wiki:img:5ad10fe37bce71897bf181fee9077186af974a9c.jpg?400}} | + | The picture below is an example of a threshold that is not inclusive enough. Note that the regions do not include much of thegreen duck. In this case, you should increase the threshold. |
| - | The picture below is an example of a threshold that is not inclusive enough. Note that the regions do not include much of the purple dinosuar. In this case, you should increase the threshold. | + | {{wiki:v2:image_238.png}} |
| - | {{wiki:img:8a6cd13952d3307cb98ba56df1c334b980c64f9b.jpg?400}} | + | The picture below is an example of a good threshold. |
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| + | {{wiki:v2:image_231.png}} | ||
wiki/v2/some_tips_on_generating_color_signatures_2.txt · Last modified: 2018/09/28 19:58 by jfrench
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