discern between someone or something and someone or something
to detect the difference between people and things. I cannot discern between the dark trees and the dark sky behind them. I cannot discern between the person and the background.
discern someone or something from something (else)
to detect the difference between someone or something and something else. I can hardly discern Tom from the busy background in this picture. I can't discern anything from that cluttered scene.
discern something from someone or something
to learn or determine something from someone or something. We discerned a lot from the eyewitnesses. We discerned a lot from our discussions with the past president.