Disparity image

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Hi, I am trying to make a stereo mapping. I am using 2 cameras of logitch. I did a stereo calibration and I think that the values are good. When I look the disparity image with the stereo_image_proc I see many speckles and not a predicted image. I tried to do the tutorial about the dynamic_reconfigure and change the parameters but nothing. I add a image from rviz that you can see what is the problem. I do not know if my stereo cameras are sync' and it is the root problem. does someone saw things like that and can help me? tnx