# Integrating with Tensorflow

Discover how to integrate OpenCV and Tensorflow, two powerful computer vision tools, for seamless development of deep learning applications. Follow our comprehensive guide with code examples to understand the theory behind integration, how to preprocess images and use pre-trained models, and why integrating OpenCV and Tensorflow can provide higher accuracy and performance in your applications.

Updated March 21, 2023

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Welcome to this tutorial on integrating OpenCV and Tensorflow. OpenCV is the most popular computer vision library, while Tensorflow is a powerful deep learning framework. Integrating OpenCV and Tensorflow can allow for seamless development of computer vision and deep learning applications.

In this tutorial, we will explore how to integrate OpenCV and Tensorflow. We will discuss the theory behind integration, provide multiple code examples to illustrate the concept, and explain how and why someone would use this integration.

## Theory

OpenCV and Tensorflow are both popular tools for computer vision and deep learning. OpenCV provides a range of image processing techniques and tools, while Tensorflow is a powerful deep learning framework for building neural networks.

Integrating OpenCV and Tensorflow allows for seamless development of computer vision and deep learning applications. OpenCV can be used to preprocess images, perform feature extraction, and create custom datasets, while Tensorflow can be used to train deep learning models and perform classification or object detection tasks.

## Code Examples

We will use Python for our examples, but the concept applies to other programming languages supported by OpenCV and Tensorflow.

### Preprocessing Images

To preprocess images with OpenCV and Tensorflow, we can use the following code:

```
import cv2
import tensorflow as tf
# Load the image
img = cv2.imread('sample_image.jpg')
# Resize the image
img = cv2.resize(img, (224, 224))
# Convert the image to a tensor
img_tensor = tf.convert_to_tensor(img)
# Normalize the image
img_tensor = img_tensor / 255.0
# Expand the dimensions of the tensor
img_tensor = tf.expand_dims(img_tensor, 0)
# Preprocess the image for Tensorflow
img_tensor = tf.keras.applications.resnet.preprocess_input(img_tensor)
# Use the preprocessed image for further processing with Tensorflow
```

In the above code, we first load the image using OpenCV and resize it to 224x224 pixels, which is the input size required by many pre-trained models in Tensorflow.

Next, we convert the image to a tensor using Tensorflow, normalize the tensor to values between 0 and 1, and expand the dimensions of the tensor to match the expected input shape of many pre-trained models.

Finally, we preprocess the tensor for use with Tensorflow by using the `preprocess_input()`

function from the Keras API, which applies normalization and converts the image to the format expected by the pre-trained model.

### Using Pre-Trained Models

To use pre-trained models with OpenCV and Tensorflow, we can use the following code:

```
import cv2
import tensorflow as tf
# Load the image
img = cv2.imread('sample_image.jpg')
# Preprocess the image
img = cv2.resize(img, (224, 224))
img_tensor = tf.convert_to_tensor(img)
img_tensor = img_tensor / 255.0
img_tensor = tf.expand_dims(img_tensor, 0)
img_tensor = tf.keras.applications.resnet.preprocess_input(img_tensor)
# Load the pre-trained model
model = tf.keras.applications.ResNet50(weights='imagenet')
# Use the pre-trained model to make predictions
predictions = model.predict(img_tensor)
# Decode the predictions
decoded_predictions = tf.keras.applications.resnet.decode_predictions(predictions, top=5)
# Display the top 5 predictions
for i in range(len(decoded_predictions[0])):
label = decoded_predictions[0][i][1]
confidence = decoded_predictions[0][i][2]
print(f"{i+1}. {label}: {confidence*100}%")
```

In the above code, we first preprocess the image as in the previous example.

Next, we load a pre-trained ResNet50 model using the ResNet50() function from the Keras API, which is pre-trained on the ImageNet dataset.

We then use the pre-trained model to make predictions on the preprocessed image by passing it through the predict() function. The output of this function is a vector of class probabilities.

Finally, we decode the predictions using the `decode_predictions()`

function from the Keras API, which converts the class probabilities to class labels and confidence scores, and display the top 5 predictions.

## Why Use OpenCV and Tensorflow Integration?

Integrating OpenCV and Tensorflow can provide several benefits when developing computer vision and deep learning applications. OpenCV provides a range of image processing tools and techniques, which can be used to preprocess images, perform feature extraction, and create custom datasets. Tensorflow, on the other hand, provides a powerful deep learning framework for building neural networks and performing classification or object detection tasks.

Integrating OpenCV and Tensorflow can allow for seamless development of computer vision and deep learning applications. By using OpenCV to preprocess images and Tensorflow to perform deep learning tasks, developers can take advantage of the strengths of both libraries and achieve higher accuracy and performance in their applications.

## Conclusion

In this tutorial, we explored how to integrate OpenCV and Tensorflow. We discussed the theory behind integration, provided multiple code examples to illustrate the concept, and explained how and why someone would use this integration.

Integrating OpenCV and Tensorflow can provide several benefits when developing computer vision and deep learning applications. By taking advantage of the strengths of both libraries, developers can achieve higher accuracy and performance in their applications.

We hope that this tutorial has been helpful and informative for beginners and those looking to explore the world of computer vision and deep learning. For further information, please refer to the OpenCV and Tensorflow documentation and explore the different image processing and deep learning techniques and their applications.