2D　phase-unwrapping　algorithms　(PUAs)　are　commonly　used　to　obtain　a　continuous　phase　map　from　the　sawtooth-shaped　phase　map.　However,　implementing　PUAs　can　be　time　consuming,　and　the　accuracy　of　those　algorithms　may　be　low　if　there　is　heavy　noise.　In　this　paper,　we　develop　a　simple　and　robust　PUA　based　on　the　transport　of　intensity　equation　(TIE).　In　our　method,　the　TIE　was　solved　using　the　fast　cosine　transform,　and　a　phase　correction　operation　was　introduced　after　the　TIE　was　solved.　Because　of　the　phase　correction　operation,　the　proposed　method　can　obtain　a　satisfactory　unwrapping　result　even　in　a　notably　hash　noise　condition.　The　simulation　and　experimental　results　are　presented　to　validate　the　effectiveness　of　the　proposed　method.