add euslisp image processing example from ROS iamge

roseus_tutorials/src/image-processing.l

@@ -0,0 +1,44 @@
+#!/usr/bin/env roseus
+
+(ros::load-ros-manifest "sensor_msgs")
+
+;; vision callback
+(defun cb (msg)
+  (let (img width height)
+    (setq width (send msg :width)
+          height (send msg :height))
+    (ros::ros-info "w: ~A, h: ~A, encoding: ~A" width height (send msg :encoding))
+    (setq img (instance color-image24 :init width height (send msg :data)))
+    ;; debug
+    ;; (write-image-file "image.png" img)
+    ;; show original image
+    (if (not (boundp '*v-color*))
+        (setq *v-color* (instance x::xwindow :create :width width :height height)))
+    (swap-rgb img)
+    (send *v-color* :putimage (img . entity))
+    (send *v-color* :flush)
+
+    ;; show gray image
+    (if (not (boundp '*v-gray*))
+        (setq *v-gray* (instance x::xwindow :create :width width :height height)))
+    (setq gray-image (send img :monochromize))
+    (send *v-gray* :putimage ((send gray-image :to24). entity)) ;; to24 for x::window????
+    (send *v-gray* :flush)
+
+    ;; function not found
+    ;; (send gray-image :edge1)
+    ))
+
+;; init roseus
+(ros::roseus "image-processing")
+(ros::subscribe "image" sensor_msgs::Image #'cb))
+
+;; main loop
+(warning-message 2 "start main loop~%")
+(ros::rate 10)
+(while (ros::ok)
+  (ros::spin-once)
+  (ros::sleep)
+  ;(x::window-main-one)
+  )
+(ros::exit)