Free Download Mage Detection Tutor
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free download Mage Detection Tutor
The reason this method works is due to the definition of the Laplacian operator itself, which is used to measure the 2nd derivative of an image. The Laplacian highlights regions of an image containing rapid intensity changes, much like the Sobel and Scharr operators. And, just like these operators, the Laplacian is often used for edge detection. The assumption here is that if an image contains high variance then there is a wide spread of responses, both edge-like and non-edge like, representative of a normal, in-focus image. But if there is very low variance, then there is a tiny spread of responses, indicating there are very little edges in the image. As we know, the more an image is blurred, the less edges there are.
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In this tutorial, you will learn how to perform liveness detection with OpenCV. You will create a liveness detector capable of spotting fake faces and performing anti-face spoofing in face recognition systems.
In order to perform face detection, we need to create a blob from the image (Lines 53 and 54). This blob has a 300300 width and height to accommodate our Caffe face detector. Scaling the bounding boxes will be necessary later, so Line 52, grabs the frame dimensions.
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The visualize_predictions function is a helper method used to visualize the input images to our autoencoder as well as their corresponding output reconstructions. Both the original and reconstructed (recon) images will be arranged side-by-side and stacked vertically according to the number of samples parameter. This code should look familiar if you read either my introduction to autoencoders guide or denoising autoencoder tutorial.
Notice here how we are manually specifying our --confidence command line argument of 0.7, meaning that object detections with a predicted probability > 70% will be considered a true-positive detection (if you remember, the detect_image.py script defaults the minimum confidence to 90%).
In our previous section, you learned how to apply object detection to single images at PyTorch. This section will show you how to use PyTorch to apply object detection to video streams.
Detecting the circles is handled by the cv2.HoughCircles function on Line 17. We pass in the image we want to detect circles as the first argument, the circle detection method as the second argument (currently, the cv2.cv.HOUGH_GRADIENT method is the only circle detection method supported by OpenCV and will likely be the only method for some time), an accumulator value of 1.5 as the third argument, and finally a minDist of 100 pixels.
Lines 2-5 handle our imports. Notice that we import our custom quantify_image function to calculate features on our input image. We also import pickle to load our anomaly detection model. OpenCV will be used for loading, preprocessing, and displaying images.
This step is fairly intuitive and straightforward. As we learned from our tutorial on smoothing and blurring, smoothing an image allows us to ignore much of the detail and instead focus on the actual structure.
We've added a new algorithm to detect free standing objects on plain backgrounds. The API will add background space or remove superfluous areas when the aspect ratio is changed. This way the object in your image will remain free-standing and does not get cut-off at the edges when resizing.
Future efforts in fire/smoke detection research should focus less on the actual deep learning architectures/training methods and more on the actual dataset gathering and curation process, ensuring the dataset better represents how fires start, smolder, and spread in natural scene images.
Note: Make sure to download and install opencv and and opencv-contrib releases for OpenCV 3.3. This will ensure that the deep neural network (dnn) module is installed. You must have OpenCV 3.3 (or newer) to run the code in this tutorial.
scikit-image will only search for images stored in the default directory.Only specify the directory if you wish to download the images to your ownfolder for a particular reason. You can access the location of the defaultdata directory by inspecting the variable skimage.data.data_dir.