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image_proc unsynchonized by the topic ?

please help me :(

$ rosrun image_transport republish compressed in:=usb_cam/image raw out:=usb_cam/image

$ ROS_NAMESPACE=usb_cam rosrun image_proc image_proc image_raw:=image _approximate_s=true _queue_size:=20

Image messages received:      0
CameraInfo messages received: 45
Synchronized pairs:           0

image_proc unsynchonized by the topic ?

please help me :(

$ rosrun image_transport republish compressed in:=usb_cam/image raw out:=usb_cam/image

$ ROS_NAMESPACE=usb_cam rosrun image_proc image_proc image_raw:=image _approximate_s=true _queue_size:=20

Image messages received:      0
CameraInfo messages received: 45
Synchronized pairs:           0

image_proc unsynchonized by the topic ?

please help me :(

$ rosrun image_transport republish compressed in:=usb_cam/image raw out:=usb_cam/image

$ ROS_NAMESPACE=usb_cam rosrun image_proc image_proc image_raw:=image _approximate_s=true _queue_size:=20

Image messages received:      0
CameraInfo messages received: 45
Synchronized pairs:           0

image_proc unsynchonized by the topic ?

please help me :(

$ rosrun image_transport republish compressed in:=usb_cam/image raw out:=usb_cam/image

$ ROS_NAMESPACE=usb_cam rosrun image_proc image_proc image_raw:=image _approximate_s=true _queue_size:=20

Image messages received:      0
CameraInfo messages received: 45
Synchronized pairs:           0

image_proc unsynchonized by the topic ?[image_transport] Topics '/usb_cam/image_color' and '/usb_cam/camera_info' do not appear to be synchronized

please help me :(

$ rosrun image_transport republish compressed in:=usb_cam/image raw out:=usb_cam/image

$ ROS_NAMESPACE=usb_cam rosrun image_proc image_proc image_raw:=image _approximate_s=true _queue_size:=20

Image messages received:      0
CameraInfo messages received: 45
Synchronized pairs:           0