Camera scripting Andreas Mittelberger Outline 1. Nion Swift camera - - PowerPoint PPT Presentation

Camera scripting

Andreas Mittelberger

Outline

• 1. Nion Swift camera API
• 2. Scientific cameras
• 3. Webcams
• 4. “Simple” scientific cameras

Nion Swift camera API

Core (nionswift) User interface (nionui) extensions ... hardware control (nionswift-instrumentation)

Nion Swift camera API

nionswift-instrumentation scan device camera device video device

Nion Swift camera API

camera device video device

• Meant for scientific cameras
• Full control over the device (via the

frame_parameters object)

• Usually comes with a graphical user

interface (control panel)

• Meant for “simple” cameras
• Only supports “Play” and “Pause”
• No extra control panel, just the buttons in

the data item panel

• Can be controlled via API
• Data acquisition via API
• Usually high data rates (compared to scanning)

Camera panel types

camera device

camera_panel_type = "ronchigram" camera_panel_type = "eels" camera_panel_type = "andor_eels"

Webcams - built-in support

conda install -n nionswift -c nion nionswift-video-capture opencv pip install nionswift-video-capture opencv-python

First we have to install the nionswift-video-capture plugin: video device

Webcams - built-in support

Edit Preferences video device

Webcams - third party

video device Edit Preferences

“Simple” scientific camera

video device

“Simple” scientific camera

video device

“Simple” scientific camera

video device

Camera scripting

from nion.utils import Registry stem_controller = Registry.get_component("stem_controller") ronchigram = stem_controller.ronchigram_camera frame_parameters = ronchigram.get_current_frame_parameters() # adjust frame_parameters here if desired frame_parameters["exposure_ms"] = 200 # start the camera ronchigram.start_playing(frame_parameters) # grab two consecutive frames, with a guaranteed start time after the first call frame1 = ronchigram.grab_next_to_start()[0] frame2 = ronchigram.grab_next_to_finish()[0] # stop the camera ronchigram.stop_playing()

Get the code

• Webcam plugin:

https://github.com/Brow71189/SwiftCam

• “Simple” scientific camera: (careful this experimental code!)

https://github.com/Brow71189/matrix_vision

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Thank you for your attention