Electrical impedance and image analysis methods in detecting and measuring Scots pine heartwood from a log end during tree harvesting. - Antti Raatevaara; Heikki Korpunen; Markku Tiitta; Laura Tomppo; Sampo Kulju; Jukka Antikainen; Jori Uusitalo (Comput. Electron. Agric., 2020)