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Hello! I have the same error:

stereo_image_proc: /tmp/buildd/ros-electric-vision-opencv-1.6.13/debian/ros-electric-vision-opencv/opt/ros/electric/stacks/vision_opencv/image_geometry/src/stereo_camera_model.cpp:30: bool image_geometry::StereoCameraModel::fromCameraInfo(const sensor_msgs::CameraInfo&, const sensor_msgs::CameraInfo&): Assertion `left_.fy() == right_.fy()' failed. Aborted

Here is my node launch file:

<group ns="xb3_short"> <node name="stereo_image_proc" pkg="stereo_image_proc" type="stereo_image_proc" args="_approximate_sync:=True _prefilter_size:=255 _prefilter_cap:=63 _correlation_window_size:=31 _min_disparity:=0 _disparity_range:=32 _uniqueness_ratio:=10 _texture_threshold:=100a _speckle_size:=400 _speckle_range:=15 __name:=xb3_short_stereo_proc"/> </group>

I checked the timestamps for left and right camera info topics and they match. Any idea? Thanks.