VideoPopulation
extensions.image.ImagePopulation.VideoPopulation(
self,
geometry,
opencv_version='4',
name=None,
copied=False,
)Rate-coded Population allowing to feed a webcam input into the firing rate of a population (each neuron represents one pixel).
This extension requires the C++ library OpenCV >= 4.0 (apt-get/yum install opencv). pkg-config opencv4 --cflags --libs should not return an error. vtk might additionally have to be installed.
The extensions has to be explicitly imported:
import ANNarchy as ann
from ANNarchy.extensions.image import VideoPopulation
pop = VideoPopulation(geometry=(480, 640))
compile()
pop.start_camera(0)
while(True):
pop.grab_image()
simulate(10.0)About the geometry:
- If the geometry is 2D, it corresponds to the (height, width) of the image. Only the luminance of the pixels will be represented (grayscale image).
- If the geometry is 3D, the third dimension can be either 1 (grayscale) or 3 (color).
If the third dimension is 3, each will correspond to the RGB values of the pixels.
Warning: due to the indexing system of Numpy, a 640*480 image should be fed into a (480, 640) or (480, 640, 3) population.
Parameters
| Name | Type | Description | Default |
|---|---|---|---|
| geometry | tuple | population geometry as tuple. It must be fixed through the whole simulation. If the camera provides images of a different size, it will be resized. | required |
| opencv_version | str | OpenCV version (default=4). | '4' |
| name | str | unique name of the population (optional). | None |
Methods
| Name | Description |
|---|---|
| grab_image | Grabs one image from the camera and feeds it into the population. |
| release | Releases the camera: |
| start_camera | Starts the webcam with the corresponding device (default = 0). |
grab_image
extensions.image.ImagePopulation.VideoPopulation.grab_image()Grabs one image from the camera and feeds it into the population.
The camera must be first started with:
pop.start_camera(0)release
extensions.image.ImagePopulation.VideoPopulation.release()Releases the camera:
pop.release()start_camera
extensions.image.ImagePopulation.VideoPopulation.start_camera(camera_port=0)Starts the webcam with the corresponding device (default = 0).
On linux, the camera port corresponds to the number in /dev/video0, /dev/video1, etc.