1. A method for editing an image stream comprising a plurality of image frames and captured by an in-vivo imaging device that passes through the gastrointestinal (GI) tract, the method comprising: estimating progress of the imaging device along the GI tract; based on the estimated progress, detecting oscillating motion segments of the imaging device along the GI tract, wherein oscillating motion includes backward motion segments of the imaging device traveling along the GI tract; excluding image sequences from the image stream, to produce an edited image stream, wherein the excluded image sequences are selected from the detected oscillating motion segments; and displaying the edited image stream.