New software is able to analyze exactly how many hairs there are in a patch of skin and could help in testing the effectiveness of baldness(秃头) treatments and depilatory(脱毛的) creams, say Australian researchers.

　　Researchers from CSIRO Mathematical and Information Sciences in Sydney report their findings in the November issue of the journal Skin Research and Technology.

　　The software, developed with a UK company, will make it easier for researchers developing hair removal creams to accurately assess how well they work, says Dr Pascal Vallotton.

　　"Up to now they were counting the number of hairs that survived after treatment by hand. That's hard work and it's difficult because you may count a hair twice or you may miss it." he said.

　　The software relies on images captured by a small flatbed scanner(扫描仪) pressed onto the skin. Using a mathematical algorithm(算法), the software then identifies and traces each individual hair based on an understanding of a hair's unique features, such as its relative straightness.

　　The software is able to distinguish between hairs and other features on the skin such as wounds or moles(痣).

　　"Our skin irregularities(不规则) make it difficult to say this is a hair or this is a mole," Dr Vallotton said.

　　Comparison between earlier and later images can also determine if hair is growing quickly or slowly, he says.

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