[decoder/bounding_box] Add decoder for yolov5 @open sesame 01/03 18:03

[anyj0527]

• Add a feature for decoding yolov5 model's output
• Tested with tflite models from https://github.com/ultralytics/yolov5/releases/tag/v6.0

issue #3623
sample gst-launch pipelines:

• for 640x640 model

$ gst-launch-1.0 \
v4l2src ! videoscale ! videoconvert ! video/x-raw,width=640,height=640,format=RGB,framerate=30/1,pixel-aspect-ratio=1/1 ! tee name=t \
  t. ! queue ! tensor_converter ! other/tensors,num_tensors=1,types=uint8,format=static,dimensions=3:640:640:1 ! \
    tensor_transform mode=arithmetic option=typecast:float32,add:0.0,div:255.0 ! queue leaky=2 max-size-buffers=2 ! \
    tensor_filter framework=tensorflow2-lite model=./yolov5s-fp16.tflite ! \
    other/tensors,num_tensors=1,types=float32,format=static,dimensions=85:25200:1:1 ! \
    tensor_decoder mode=bounding_boxes option1=yolov5 option2=./coco.txt option4=640:640 option5=640:640 ! \
    video/x-raw,width=640,height=640,format=RGBA ! mix.sink_0 \
  t. ! queue ! mix.sink_1 \
compositor name=mix sink_0::zorder=2 sink_1::zorder=1 ! videoconvert ! ximagesink

• for 320x320 model

$ gst-launch-1.0 \
v4l2src ! videoscale ! videoconvert ! video/x-raw,width=320,height=320,format=RGB,framerate=30/1,pixel-aspect-ratio=1/1 ! tee name=t \
  t. ! queue ! tensor_converter ! other/tensors,num_tensors=1,types=uint8,format=static,dimensions=3:320:320:1 ! \
    tensor_transform mode=arithmetic option=typecast:float32,add:0.0,div:255.0 ! queue leaky=2 max-size-buffers=2 ! \
    tensor_filter framework=tensorflow2-lite model=./yolov5s-fp16-320.tflite ! \
    other/tensors,num_tensors=1,types=float32,format=static,dimensions=85:6300:1:1 ! \
    tensor_decoder mode=bounding_boxes option1=yolov5 option2=./coco.txt option4=320:320 option5=320:320 ! \
    video/x-raw,width=320,height=320,format=RGBA ! mix.sink_0 \
  t. ! queue ! mix.sink_1 \
compositor name=mix sink_0::zorder=2 sink_1::zorder=1 ! videoconvert ! ximagesink

REF: https://github.com/ultralytics/yolov5

Self evaluation:

1. Build test: [X]Passed [ ]Failed [ ]Skipped
2. Run test: [X]Passed [ ]Failed [ ]Skipped

[taos-ci]

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[taos-ci]

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