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Real-Time Horizontal Text Detection

This demo uses a client written in Python to capture web camera frames and performs text spotting analysis via gRPC requests to OpenVINO Model Server. The client visualizes the results as bounding boxes overlaid on the original image frames using OpenCV. The client works efficiently, even over a slow network with high latency, thanks to image data compression and parallel execution for multiple frames.

horizontal text detection

Download model from OpenVINO Model Zoo

curl -L --create-dir https://storage.openvinotoolkit.org/repositories/open_model_zoo/2021.4/models_bin/3/horizontal-text-detection-0001/FP32/horizontal-text-detection-0001.bin -o horizontal-text-detection/1/model.bin https://storage.openvinotoolkit.org/repositories/open_model_zoo/2021.4/models_bin/3/horizontal-text-detection-0001/FP32/horizontal-text-detection-0001.xml -o horizontal-text-detection/1/model.xml
tree horizontal-text-detection/
horizontal-text-detection
└── 1
    ├── model.bin
    └── model.xml

Start the OVMS container:

docker run -d -u $(id -u):$(id -g) -v $(pwd)/horizontal-text-detection:/model -p 9001:9001 openvino/model_server:latest \
--model_path /model --model_name text --port 9001 --layout NHWC

Run the client

In the context of example_client directory, run the following commands.

Install python libraries:

pip3 install -r client_requirements.txt

Start the client

python3 camera_client.py --grpc_address [hostname] --grpc_port 9001

Initializing requesting thread index: 0
Initializing requesting thread index: 1
Initializing requesting thread index: 2
Initializing requesting thread index: 3
Launching requesting thread index: 0
Launching requesting thread index: 1
Launching requesting thread index: 2
Launching requesting thread index: 3
ThreadID:   0; Current FPS:    31.25; Average FPS:    25.64; Average latency:   140.98ms
ThreadID:   1; Current FPS:    31.23; Average FPS:    25.67; Average latency:   136.36ms
ThreadID:   2; Current FPS:    29.41; Average FPS:    25.70; Average latency:   130.88ms
ThreadID:   3; Current FPS:    30.30; Average FPS:    25.73; Average latency:   135.65ms
...

You can also change the camera ID:

python3 camera_client.py --grpc_address [hostname] --grpc_port 9001 --video_source 0

Or choose to work with video file as well:

python3 camera_client.py --grpc_address [hostname] --grpc_port 9001 --video_source ~/video.mp4

Note

Video source is cropped to 704x704 resolution to match model input size.

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