美圖雲修人工智能修圖解決方案的技術解析

{"type":"doc","content":[{"type":"paragraph","attrs":{"indent":0,"number":0,"align":null,"origin":null},"content":[{"type":"text","text":"後期修圖在整個商業攝影工作流程中佔主要比重，具有工作量大、週期長的特點。在拍攝旺季或拍攝任務多的情況下，從拍攝獲取原片到拿到最終成片的整個週期長達一個月左右。"}]},{"type":"paragraph","attrs":{"indent":0,"number":0,"align":null,"origin":null}},{"type":"paragraph","attrs":{"indent":0,"number":0,"align":null,"origin":null},"content":[{"type":"text","text":"同時，培養一名合格的修圖師往往需要付出高昂的人力和物力成本，即便是熟練的修圖師也需要1-3個月的時間熟悉和適應不同影樓的修圖風格和手法。但修圖師的專業水平不同，審美差異、工作狀態好壞等因素都會造成修圖質量波動。除此之外，修圖師流動率逐年上升的趨勢也成爲商業攝影行業一大難題。"}]},{"type":"paragraph","attrs":{"indent":0,"number":0,"align":null,"origin":null}},{"type":"paragraph","attrs":{"indent":0,"number":0,"align":null,"origin":null},"content":[{"type":"text","text":"爲解決商業攝影上述痛點，基於美圖成立12年來在人物影像領域積累的技術優勢，美圖技術中樞——美圖影像實驗室（MTlab）推出美圖雲修人工智能修圖解決方案，大大提升了商業攝影的後期效率。修圖過程中，AI技術在實現多場景的自適應識別調參，呈現完美光影效果的同時，還能夠快速定位人像，修復人像瑕疵，實現人像的個性化修圖。本文將重點分析美圖雲修人工智能修圖解決方案的技術細節。"}]},{"type":"paragraph","attrs":{"indent":0,"number":0,"align":null,"origin":null}},{"type":"image","attrs":{"src":"https:\/\/static001.geekbang.org\/infoq\/2d\/2d72217b22fe1905a0dffbd0591ef4db.jpeg","alt":null,"title":null,"style":null,"href":null,"fromPaste":true,"pastePass":true}},{"type":"paragraph","attrs":{"indent":0,"number":0,"align":null,"origin":null},"content":[{"type":"text","text":"圖1. 美圖雲修人像精修對比"}]},{"type":"heading","attrs":{"align":null,"level":2},"content":[{"type":"text","marks":[{"type":"strong"}],"text":"智能中性灰技術"}]},{"type":"paragraph","attrs":{"indent":0,"number":0,"align":null,"origin":null}},{"type":"paragraph","attrs":{"indent":0,"number":0,"align":null,"origin":null},"content":[{"type":"text","text":"在修圖中經常提到中性灰修圖，也稱“加深減淡”操作，通過畫筆來改變局部的深淺，在PS中需要手動建立一個觀察圖層，用以凸顯臉部瑕疵，如斑點、毛孔、痘印等，然後在觀察圖層中逐一選取瑕疵區域對原人臉對應瑕疵區域進行祛除，在此之後對膚色不均勻的地方抹勻，最大限度地保留皮膚質感，但不少情況下仍需藉助磨皮方法讓膚色均勻，但磨皮會丟失皮膚質感。對每張人像圖的皮膚區域重複該過程，可謂耗時耗力。傳統PS中性灰的修圖過程如圖2所示。"}]}]}