\section{Artificial Imagination}

 \label{sec-1}

 

 Imagine watching a video of someone skateboarding. When you watch

 the video, you can imagine yourself skateboarding, and your

 knowledge of the human body and its dynamics guides your

 interpretation of the scene. For example, even if the skateboarder

 is partially occluded, you can infer the positions of his arms and

 body from your own knowledge of how your body would be positioned if

 you were skateboarding. If the skateboarder suffers an accident, you

 wince in sympathy, imagining the pain your own body would experience

 if it were in the same situation. This empathy with other people

 guides our understanding of whatever they are doing because it is a

 powerful constraint on what is probable and possible. In order to

 make use of this powerful empathy constraint, I need a system that

 can generate and make sense of sensory data from the many different

 senses that humans possess. The two key proprieties of such a system

 are \emph{embodiment} and \emph{imagination}.

 

 \subsection{What is imagination?}

 \label{sec-1-1}

 

 One kind of imagination is \emph{sympathetic} imagination: you imagine

 yourself in the position of something/someone you are

 observing. This type of imagination comes into play when you follow

 along visually when watching someone perform actions, or when you

 sympathetically grimace when someone hurts themselves. This type of

 imagination uses the constraints you have learned about your own

 body to highly constrain the possibilities in whatever you are

 seeing. It uses all your senses to including your senses of touch,

 proprioception, etc. Humans are flexible when it comes to "putting

 themselves in another's shoes," and can sympathetically understand

 not only other humans, but entities ranging from animals to cartoon

 characters to \href{http://www.youtube.com/watch?v=0jz4HcwTQmU}{single dots} on a screen!

 

 

 \begin{figure}[htb]

 \centering

 \includegraphics[width=5cm]{./images/cat-drinking.jpg}

 \caption{A cat drinking some water. Identifying this action is beyond the state of the art for computers.}

 \end{figure}

 

 

 This is a basic test for the vision system.  It only tests the

 vision-pipeline and does not deal with loading eyes from a blender

 file. The code creates two videos of the same rotating cube from

 different angles. 

 

 

 \begin{clojurecode}

 (in-ns 'cortex.test.vision)

 

 (defn test-pipeline

   "Testing vision:

    Tests the vision system by creating two views of the same rotating

    object from different angles and displaying both of those views in

    JFrames.

 

    You should see a rotating cube, and two windows,

    each displaying a different view of the cube."

   ([] (test-pipeline false))

   ([record?]

      (let [candy

            (box 1 1 1 :physical? false :color ColorRGBA/Blue)]

        (world

         (doto (Node.)

           (.attachChild candy))

         {}

         (fn [world]

           (let [cam (.clone (.getCamera world))

                 width (.getWidth cam)

                 height (.getHeight cam)]

             (add-camera! world cam 

                          (comp

                           (view-image

                            (if record?

                              (File. "/home/r/proj/cortex/render/vision/1")))

                           BufferedImage!))

             (add-camera! world

                          (doto (.clone cam)

                            (.setLocation (Vector3f. -10 0 0))

                            (.lookAt Vector3f/ZERO Vector3f/UNIT_Y))

                          (comp

                           (view-image

                            (if record?

                              (File. "/home/r/proj/cortex/render/vision/2")))

                           BufferedImage!))

             (let [timer (IsoTimer. 60)]

               (.setTimer world timer)

               (display-dilated-time world timer))

             ;; This is here to restore the main view

             ;; after the other views have completed processing

             (add-camera! world (.getCamera world) no-op)))

         (fn [world tpf]

           (.rotate candy (* tpf 0.2) 0 0))))))

 \end{clojurecode}

 

 

 \begin{itemize}

 \item This is test1 \cite{Tappert77}.

 \end{itemize}