Methods and systems for detecting and monitoring defects in a sealing region of a container, including imaging at least part of the sealing region of the container using a camera operative at a wavelength in the range of 0.76 μm-14 μm; during and/or after the filling of the container with a filling material and prior to sealing of the container being completed; and identifying, based on at least one frame obtained from the imaging, defects in the sealing region.