[en] Image processing technology with image sensors have replaced the optical microscopes used for for watching tree initiation and development in organic isolation materials. A new method of diagnosing the treeing degradation by image processing and online video monitoring of treeing degradation process has been described in this article. Holographic sizing of contaminants provides with video acquisition of impurities and sizes in the high voltage insulators used in power industries. Holography is used to measure the size of particles in high voltage cross-linked polyethylene cable. Twin beam laser scattering system technique have been used to measure the size of microparticle in HV vacuum gaps. (A.B.)