美图云修人工智能修图解决方案的技术解析

{"type":"doc","content":[{"type":"paragraph","attrs":{"indent":0,"number":0,"align":null,"origin":null},"content":[{"type":"text","text":"后期修图在整个商业摄影工作流程中占主要比重，具有工作量大、周期长的特点。在拍摄旺季或拍摄任务多的情况下，从拍摄获取原片到拿到最终成片的整个周期长达一个月左右。"}]},{"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":"同时，培养一名合格的修图师往往需要付出高昂的人力和物力成本，即便是熟练的修图师也需要1-3个月的时间熟悉和适应不同影楼的修图风格和手法。但修图师的专业水平不同，审美差异、工作状态好坏等因素都会造成修图质量波动。除此之外，修图师流动率逐年上升的趋势也成为商业摄影行业一大难题。"}]},{"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":"为解决商业摄影上述痛点，基于美图成立12年来在人物影像领域积累的技术优势，美图技术中枢——美图影像实验室（MTlab）推出美图云修人工智能修图解决方案，大大提升了商业摄影的后期效率。修图过程中，AI技术在实现多场景的自适应识别调参，呈现完美光影效果的同时，还能够快速定位人像，修复人像瑕疵，实现人像的个性化修图。本文将重点分析美图云修人工智能修图解决方案的技术细节。"}]},{"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":"图1. 美图云修人像精修对比"}]},{"type":"heading","attrs":{"align":null,"level":2},"content":[{"type":"text","marks":[{"type":"strong"}],"text":"智能中性灰技术"}]},{"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":"在修图中经常提到中性灰修图，也称“加深减淡”操作，通过画笔来改变局部的深浅，在PS中需要手动建立一个观察图层，用以凸显脸部瑕疵，如斑点、毛孔、痘印等，然后在观察图层中逐一选取瑕疵区域对原人脸对应瑕疵区域进行祛除，在此之后对肤色不均匀的地方抹匀，最大限度地保留皮肤质感，但不少情况下仍需借助磨皮方法让肤色均匀，但磨皮会丢失皮肤质感。对每张人像图的皮肤区域重复该过程，可谓耗时耗力。传统PS中性灰的修图过程如图2所示。"}]}]}