ptam and cameracalibrator won't start [closed]

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Hi,

i'm trying to get ptam working but it doesn't start up. I use usb_cam and since it shouted that it had no calibrationfile i created one with the camera_calibrator node (not ptam). The resulted yaml file is in ~/.ros/camera_info/head_camera.yaml .

I tried to startup ptam with the launcher and just by running the node. Since running the Node resulted in

[ERROR] [1405509643.099105236]: Camera calibration is missing!

I thought perhaps i have to recalibrate it with the ptam cameracalibrator but that doesn't work either. For both launch files the console says that Gui is on but none of them starts.

For the ptam launch file i get

[FATAL] [1405526258.946873148]: ASSERTION FAILED
    file = /home/gerken/ROS/cat_workspace/src/ethzasl_ptam/ptam/src/System.cc
    line = 95
    cond = img->encoding == sensor_msgs::image_encodings::MONO8 && img->step == img->width

Could it be that i have to put the encoding to mono8 anyhow?

Camera Info is

---
header: 
  seq: 8394
  stamp: 
    secs: 1405526539
    nsecs: 828073023
  frame_id: head_camera
height: 480
width: 640
distortion_model: plumb_bob
D: [0.105716, -1.882404, -0.020112, 0.008704, 0.0]
K: [1043.949364, 0.0, 312.91979, 0.0, 1042.363345, 178.105619, 0.0, 0.0, 1.0]
R: [1.0, 0.0, 0.0, 0.0, 1.0, 0.0, 0.0, 0.0, 1.0]
P: [1036.78418, 0.0, 314.804614, 0.0, 0.0, 1031.130981, 173.315955, 0.0, 0.0, 0.0, 1.0, 0.0]
binning_x: 0
binning_y: 0
roi: 
  x_offset: 0
  y_offset: 0
  height: 0
  width: 0
  do_rectify: False
---

ptam.launch is

<launch>
    <node name="ptam" pkg="ptam" type="ptam" clear_params="true" output="screen">
        <remap from="image" to="$(optenv IMAGE /usb_cam/image_raw)" />
        <remap from="pose" to="pose"/>
        <rosparam file="$(find ptam)/PtamFixParams.yaml"/>
    </node>
</launch>

I didn't change PtamFixValues.yaml as the with and the height of the picture is the default value.

Thanks for your Help!

Andreas