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 **Face Detectors** - [`Demo`](https://youtu.be/GZ2p2hj2H5k)
 
-Face detection and alignment are early stages of a modern face recognition pipeline. Experiments show that just alignment increases the face recognition accuracy almost 1%. [`OpenCV`](https://sefiks.com/2020/02/23/face-alignment-for-face-recognition-in-python-within-opencv/), [`SSD`](https://sefiks.com/2020/08/25/deep-face-detection-with-opencv-in-python/), [`Dlib`](https://sefiks.com/2020/07/11/face-recognition-with-dlib-in-python/),  [`MTCNN`](https://sefiks.com/2020/09/09/deep-face-detection-with-mtcnn-in-python/) and [`RetinaFace`](https://sefiks.com/2021/04/27/deep-face-detection-with-retinaface-in-python/) detectors are wrapped in deepface. OpenCV is the default detector.
+Face detection and alignment are important early stages of a modern face recognition pipeline. Experiments show that just alignment increases the face recognition accuracy almost 1%. [`OpenCV`](https://sefiks.com/2020/02/23/face-alignment-for-face-recognition-in-python-within-opencv/), [`SSD`](https://sefiks.com/2020/08/25/deep-face-detection-with-opencv-in-python/), [`Dlib`](https://sefiks.com/2020/07/11/face-recognition-with-dlib-in-python/),  [`MTCNN`](https://sefiks.com/2020/09/09/deep-face-detection-with-mtcnn-in-python/) and [`RetinaFace`](https://sefiks.com/2021/04/27/deep-face-detection-with-retinaface-in-python/) detectors are wrapped in deepface.
+
+<p align="center"><img src="https://raw.githubusercontent.com/serengil/deepface/master/icon/detector-portfolio.png" width="95%" height="95%"></p>
+
+All functions in the deepface interface accept an optional detector backend input argument. You can switch among those detectors with this argument. OpenCV is the default detector.
 
 ```python
 backends = ['opencv', 'ssd', 'dlib', 'mtcnn', 'retinaface']
@@ -131,9 +135,15 @@ df = DeepFace.find(img_path = "img.jpg", db_path = "my_db", detector_backend = b
 demography = DeepFace.analyze(img_path = "img4.jpg", detector_backend = backends[4])
 ```
 
-<p align="center"><img src="https://raw.githubusercontent.com/serengil/deepface/master/icon/deepface-detectors.png" width="90%" height="90%"></p>
+Face recognition models are actually CNN models and they expect standard sized inputs. So, resizing is required before representation. To avoid deformation, deepface adds black padding pixels after detection and alignment.
 
-[RetinaFace](https://sefiks.com/2021/04/27/deep-face-detection-with-retinaface-in-python/) and [MTCNN](https://sefiks.com/2020/09/09/deep-face-detection-with-mtcnn-in-python/) seem to overperform in detection and alignment stages but they are slower than others. If the speed of your pipeline is more important, then you should use opencv or ssd. On the other hand, if you consider the accuracy, then you should use retinaface or mtcnn.
+<p align="center"><img src="https://raw.githubusercontent.com/serengil/deepface/master/icon/deepface-detectors-v2.jpg" width="90%" height="90%"></p>
+
+[RetinaFace](https://sefiks.com/2021/04/27/deep-face-detection-with-retinaface-in-python/) and [MTCNN](https://sefiks.com/2020/09/09/deep-face-detection-with-mtcnn-in-python/) seem to overperform in detection and alignment stages but they are much slower. If the speed of your pipeline is more important, then you should use opencv or ssd. On the other hand, if you consider the accuracy, then you should use retinaface or mtcnn.
+
+The performance of RetinaFace is very satisfactory even in the crowd as seen in the following illustration.
+
+<p align="center"><img src="https://raw.githubusercontent.com/serengil/deepface/master/icon/retinaface-results.jpeg" width="70%" height="70%"></p>
 
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 **Ensemble learning for face recognition** - [`Demo`](https://youtu.be/EIBJJJ0ECXU)