That is noise / offset pixels or unexpected dark or light strips fringing an object.
Data from airborne multispectral or hyperspectral imaging scanners shows a pronounced striping pattern due to varying offsets in the multielement detectors. This effect can be further exacerbated by unfavorable sun angle. These artifacts can be minimized by correcting each scanline to a scene-derived average ( Kruse, 1988).
Use the Image Interpreter or the Spatial Modeler to implement algorithms to eliminate striping.The Spatial Modeler editing capabilities allow you to adapt the algorithms to best address the data. The IMAGINE Radar Interpreter Adjust Brightness function also corrects some of these problems.
or by using low pass filter on the image.
or in fourier analysis try using perodic noise removal.
hope it helps.