====== Client - User Application (GUI) ======

{{:client_user_application.jpg?direct&600|}}´

====== Server - Data Acquisition ======

Data Acquisition on the Frontend: Server for Multiple Clients

Image Acquisition and Processing      
  * image acquisition
  * software crop
  * rotation (90°, 180°, 270°)
  * mirror 
  * simple image scaling
  * projections
  * simple analysis neglecting further perspective distortion
    * histogram
    * position of brightest pixel
    * center-of-brightness
    * FWHM

Camera / Software Settings (if suppported)
  * acquisition mode (free running / triggered)
  * exposure time
  * binning
  * gain boost
  * contrast
  * brightness
  * rotation / mirror
  * area-of-interest (fixed during runtime)       

====== Perspective Distortion ======

scintillating screen typically mounted under 45° with respect to the optical axis
  * short distance leads to visible perspective distortion
  * position in SI units can be calculated for each pixel by

{{:perspective_distortion.jpg?nolink&400|}}       

  * we do not rectify the image!

{{:perspective_distortion2.jpg?direct&200|}}

scintillating screen typically mounted under 45° with respect to the optical axis
  * standard target holder contains alignment marks
  * all scale factors are determined from the marks
  * vertically mounted assemblies
    * Δs xx = 0 and Δs yx = 0
  * horizontally mounted assemblies
    * Δs xy = 0 and Δs yy = 0

{{:technical_drawing_left.jpg?direct&200|}}

perspective distortion is solely handled by the Client
  * overlay a grid showing the perspective distortion
  * display pixel coordinates in SI units taking perspective into account

{{::perspective_distortion3.jpg?direct&400|}}