Darknet in opencv faster

darknet in opencv faster

Darknet in opencv faster

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We can get good FPS when running inference on real-time videos for object detection and image segmentation applications. For example, let us take a look at image classification inference speed for different frameworks. The above results are inference timing for the DenseNet model. The above benchmarks are done using the latest versions at the time of this writing.

They are PyTorch 1. All tests are done on Google Colab which has Intel Xeon processors 2. Because of its fast inference time, even on CPUs, it can act as an excellent deployment tool on edge devices where computation power is limited. The edge devices based on ARM processors are some of the best examples of this. The following graph is good proof of that. The results are very impressive. The above few graphs show optimized OpenCV, and how fast it is for neural network inference.

We have established that by using the OpenCV DNN module, we can carry out deep-learning based computer vision inference on images and videos. Let us take a look at all the functionalities it supports. Interestingly, most of the deep learning and computer vision tasks that we can think of are supported.

The following list will give us a pretty good idea of the features. The list is extensive and provides a lot of practical deep learning use cases. The impressive fact is that there are many models to choose from depending on systems hardware, compute capability we will see them a bit later.

Starting from really compute-intensive models for state-of-the-art results to models which can run on low powered edge devices, we can find a model for every use case. Observe that it is impossible to go through all the above use cases in a single blog post. Hence, we will discuss Object Detection and human pose estimation in detail to give an idea of the working of select, different models using OpenCV DNN.

To support all the applications that we discussed above, we need a lot of pre-trained models. Moreover, there are many state-of-the-art models to choose from. The following table lists out some of the models according to the different deep learning applications. The models mentioned above are not exhaustive. There exist many more models. As noted earlier, complete listing or discussing each in detail in a single blog is almost impossible. The above list gives us a pretty good idea of how practical the DNN module can be to explore deep learning in computer vision.

Actually, no. One is the model. The other one is the model architecture file which has a. To get a clear idea of how this file looks, please visit this link. For loading pre-trained TensorFlow models, we also need two files. The model weights file and a protobuf text file contains the model configuration. The weight file has a. If you have worked with TensorFlow before, you would know that the.

The model configuration is held in the protobuf text file, which has a. Note: In newer versions of TensorFlow the model weight file might not be in. This is also true if you are trying to use one of your own saved models which may be in. In that case, there are some intermediate steps to be performed before the models can be used with the OpenCV DNN module. In such cases, converting the models to ONNX format and then to.

For loading Torch model files, we need the file containing the pre-trained weights. Generally, this file has a. But with the latest PyTorch models having a. Generally, to load the Darknet models, we need one model weights file having the. The network configuration file will always be a. Please visit the official OpenCV documentation to know about the different frameworks, their weight files and the configuration files.

Most probably, the above list covers all the famous deep learning frameworks. In theory, any model from any of the above frameworks should work with the DNN module. We only need to find the correct weight file and the corresponding neural network architecture file. Things will clarify more when we will start the coding part of this tutorial. We have covered enough theory. Let us dive into the coding part of this tutorial.

Then we will carry out object detection using the DNN module. We will cover each step in detail to clear everything by the time we end this section. We will use a neural network model trained on the very famous ImageNet dataset using the Caffe framework. Specifically, we will use the DensNet deep neural network model for the classification task. The advantage being it is pre-trained on classes from the ImageNet dataset. We can expect that whatever image we want to classify will already have been seen by the model.

This allows us to choose from an extensive range of images. Remember that we discussed that the DenseNet model we will use had been trained on the ImageNet classes. We will need some way to load these classes into memory and have easy access to them. Such classes are typically available in text files. Each new line contains all the labels or class names that are specific to a single image. For example, the first line contains tench, Tinca Tinca.

These are two names that belong to the same kind of fish. Similarly, the second line has two names belonging to the goldfish. Typically, the first name is the most common name that almost everyone recognizes. Let us see how we can load such a text file and extract the first name from each line to use them as labels while classifying images.

First, we open the text file containing all the class names in reading mode and split them using each new line. However, we need the first name from each line only. That is what the second line of code does. Now, the list will look like the following.

As discussed earlier, we will use a pre-trained DenseNet model that has been trained using the Caffe deep learning framework. We will need the model weight files. Along with the readNet function, the DNN module also provides functions to load models from specific frameworks, where we do not have to provide the framework argument. The following are those functions. This blog post will stick with the readNet function to load the pre-trained models.

We will use the same function in the object detection section as well. Note there are a few other details that we need to take care of. The pre-trained models that we load using the DNN module do not directly take the read image as input.

We need to do some preprocessing before that. While reading the image, we assume that it is two directories previous to the current directory and inside the input folder. The next few steps are essential. We have a blobFromImage function which prepares the image in the correct format to be fed into the model. Let us go over all the arguments and learn about them in detail. There is one other thing to note here. All the deep learning models expect input in batches.

However, we only have one image here. Nevertheless, the blob output that we get here actually has a shape of [1, 3, , ]. Observe that one extra batch dimension has been added by the blobFromImage function.

This would be the final and correct input format for the neural network model. The outputs , which is an array, holds all the predictions. But before we can see the outputs and class labels correctly, there are a few preprocessing steps that we need to complete. Currently, outputs has a shape of 1, , 1, 1 and it is difficult to extract the class labels as it is. So, the following block of code reshapes the outputs , after which we can easily get the correct class labels and map the label ID to the class names.

Facenet is developed by Google in , the result of the net is the Euclidean embedding of human face. By careful defined triplet loss function, facenet achieves high accuracy on LFW 0. Darknet is a fast, easy to read DL framework. Yolo is running based on it. VJ method is faster, but the unstable cropping may slightly influence recognition accuracy.

KNN is the final classification method, but it is suffered for openset problem. The d feature before bottleneck layer with normalization is used for KNN, because it has better result in openset than original facenet model, but you can still try the original network configure yourself just replacing facenet. The facenet. Skip to content. Star Face recognition using facenet 29 stars 9 forks. This commit does not belong to any branch on this repository, and may belong to a fork outside of the repository.

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