The special technique based on the probabilistic- statistical approach 
for the obtained infrared images analysis is presented. 
The technique is based on thermal image processing using statistical approaches. 
The entity if this technique is that integral similarity test 
for the tested object and virtual template is calculated. 
When calculating this test generated by obtained thermal images histograms 
are used and this histograms differences by the shape, 
by the height as well as the position on the temperature axis are taken into account. 
For the sorting by the proposed integral test the versatile decision rule is proposed. 
The given technique approval on the real objects allowed to reveal the number 
of faulty units that was confirmed by the aggregate breakup. 
Developed technique can be applied also to any other objects which answer 
the concepts of thermography and hold the enough number of single-type units.