In pore detection of digital image of the skin

influenced by the factors such as uneven lighting

spots

oil and hair

etc

false detection often occur. Aiming at this problem

a pore detection algorithm based on joint feature constraint is proposed. The algorithm takes full account of influence factors. Based on feature of color

pore is segmented by the threshold value which is computed by the improved Ostu algorithm. Based on the pore size and shape characteristics

the selected candidate targets were carefully selected to obtain accurate pore test results.Experimental result shows that this algorithm has high detection accuracy

high efficiency and good robustness.