converting one topic to another (front_cam/camera/image to sensor_msgs/image)

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Hello,

I am thinking of incorporating visual odometry onto hector-quadrotor which currently uses LIDAR. There is a front cam functionality ( topics like:

/front_cam/camera/image
/front_cam/camera/image/compressed
/front_cam/camera/image/compressed/parameter_descriptions
/front_cam/camera/image/compressed/parameter_updates
/front_cam/camera/image/compressedDepth
/front_cam/camera/image/compressedDepth/parameter_descriptions
/front_cam/camera/image/compressedDepth/parameter_updates
/front_cam/camera/image/theora
/front_cam/camera/image/theora/parameter_descriptions
/front_cam/camera/image/theora/parameter_updates

while the visual odometry (viso2_ros subscribes to sensor_msgs/image).

Is it possible to covert from front_cam/camera/image to sensor_msgs/image . Tried to look up for /front_cam but couldn't find any documentation relating to that

Thanks