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This paper describes the development and implementation of such an in situ defect detection strategy for powder bed fusion ( PBF ) AM using supervised machine learning.During the build process , multiple images were collected at each build layer using a high resolution digital single-lens reflex ( DSLR ) camera .
 in situ, defect, powder bed fusion, PBF, AM, machine, build, images, build layer, high resolution, camera
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: manufacturing standard, machanical property, manufacturing process, material, engineering feature, process parameter, machine or equipment, application, process characterization, enabling technology, biomedical, concept or principle 
Text: {0} 
Answer:
 in situ, defect, powder bed fusion, PBF, AM, machine, build, images, build layer, high resolution, camera