Image Segmentation Python* Demo

This topic demonstrates how to run the Image Segmentation demo application, which does inference using image segmentation networks like FCN8.

How It Works

Upon the start-up the demo application reads command line parameters and loads a network and an image to the Inference Engine plugin. When inference is done, the application creates an output image.

NOTE: By default, Inference Engine samples and demos expect input with BGR channels order. If you trained your model to work with RGB order, you need to manually rearrange the default channels order in the sample or demo application or reconvert your model using the Model Optimizer tool with --reverse_input_channels argument specified. For more information about the argument, refer to When to Specify Input Shapes section of Converting a Model Using General Conversion Parameters.

Running

Running the application with the -h option yields the following usage message:

python3 segmentation_demo.py -h

The command yields the following usage message:

usage: segmentation_demo.py [-h] -m MODEL -i INPUT [INPUT ...]
                            [-l CPU_EXTENSION] [-pp PLUGIN_DIR] [-d DEVICE]
                            [-nt NUMBER_TOP] [-ni NUMBER_ITER] [-pc]

Options:
  -h, --help            Show this help message and exit.
  -m MODEL, --model MODEL
                        Required. Path to an .xml file with a trained model.
  -i INPUT [INPUT ...], --input INPUT [INPUT ...]
                        Required. Path to a folder with images or path to an
                        image files
  -l CPU_EXTENSION, --cpu_extension CPU_EXTENSION
                        Optional. Required for CPU custom layers. Absolute
                        MKLDNN (CPU)-targeted custom layers. Absolute path to
                        a shared library with the kernels implementations
  -pp PLUGIN_DIR, --plugin_dir PLUGIN_DIR
                        Optional. Path to a plugin folder
  -d DEVICE, --device DEVICE
                        Optional. Required for CPU custom layers Specify the target device to infer on; CPU,
                        GPU, FPGA, HDDL or MYRIAD is acceptable. Sample will
                        look for a suitable plugin for device specified (CPU
                        by default)
  -nt NUMBER_TOP, --number_top NUMBER_TOP
                        Optional. Number of top results
  -ni NUMBER_ITER, --number_iter NUMBER_ITER
                        Optional. Number of inference iterations
  -pc, --perf_counts    Optional. Report performance counters

Running the application with the empty list of options yields the usage message given above and an error message.

To run the sample, you can use public or pre-trained models. You can download the pre-trained models with the OpenVINO Model Downloader or from https://download.01.org/opencv/.

NOTE: Before running the sample with a trained model, make sure the model is converted to the Inference Engine format (*.xml + *.bin) using the Model Optimizer tool.

You can use the following command do inference on Intel&reg CPU; Processors on an image using a trained FCN8 network:

python3 segmentation_demo.py -i <path_to_image>/inputImage.bmp -m <path_to_model>/fcn8.xml

Demo Output

The application outputs are a segmented image (out.bmp).

See Also

• Using Inference Engine Samples
• Model Downloader