Hello Image Classification

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This basic introduction to OpenVINO™ shows how to do inference with an image classification model.

A pre-trained MobileNetV3 model from Open Model Zoo is used in this tutorial. For more information about how OpenVINO IR models are created, refer to the TensorFlow to OpenVINO tutorial.


import cv2
import matplotlib.pyplot as plt
import numpy as np
from openvino.runtime import Core

Load the Model

ie = Core()
model = ie.read_model(model="model/v3-small_224_1.0_float.xml")
compiled_model = ie.compile_model(model=model, device_name="CPU")

output_layer = compiled_model.output(0)

Load an Image

# The MobileNet model expects images in RGB format.
image = cv2.cvtColor(cv2.imread(filename="../data/image/coco.jpg"), code=cv2.COLOR_BGR2RGB)

# Resize to MobileNet image shape.
input_image = cv2.resize(src=image, dsize=(224, 224))

# Reshape to model input shape.
input_image = np.expand_dims(input_image, 0)

Do Inference

result_infer = compiled_model([input_image])[output_layer]
result_index = np.argmax(result_infer)
# Convert the inference result to a class name.
imagenet_classes = open("../data/datasets/imagenet/imagenet_2012.txt").read().splitlines()

# The model description states that for this model, class 0 is a background.
# Therefore, a background must be added at the beginning of imagenet_classes.
imagenet_classes = ['background'] + imagenet_classes

'n02099267 flat-coated retriever'