美颜sdk人像美妆是非常重要的一个功能，目前深受广大用户喜爱，本篇文章小编将为大家讲解一下美颜sdk人像美妆功能的代码以及算法实现流程。

1、人像美妆算法流程

首先进行妆容模板制作，主要由Photoshop等编辑软件制作，最终由设计完成。人脸检测，特征点识别，这一步骤主要通过人脸检测、人脸对齐等技术来获得N个特征点。接下来基于人脸特征点，将模板变形，对齐到人脸五官区域。其中，变相算法有很多，包含仿射变化，IDW变换，MLS变换，RMLS变换等。最后将模板与人脸五官图像进行融合，融合算法主要有alpha融合，Photoshop图层混合，泊松融合等。由于篇幅原因，关于变换融合，就不再一一展开了。

2、代码分析
//
// MHOpenDemoUITests.m
// MHOpenDemoUITests
//
// Created by Apple on 2021/5/31.
//
//
//
//
//

#import <XCTest/XCTest.h>

@interface MHOpenDemoUITests : XCTestCase

@end

@implementation MHOpenDemoUITests

• (void)setUp {
  // Put setup code here. This method is called before the invocation of each test method in the class.

  // In UI tests it is usually best to stop immediately when a failure occurs.
  self.continueAfterFailure = NO;

  // In UI tests it’s important to set the initial state - such as interface orientation - required for your tests before they run. The setUp method is a good place to do this.
  }

• (void)tearDown {
  // Put teardown code here. This method is called after the invocation of each test method in the class.
  }

• (void)testExample {
  // UI tests must launch the application that they test.
  XCUIApplication *app = [[XCUIApplication alloc] init];
  [app launch];

  // Use recording to get started writing UI tests.
  // Use XCTAssert and related functions to verify your tests produce the correct results.
  }

• (void)testLaunchPerformance {
  if (@available(macOS 10.15, iOS 13.0, tvOS 13.0, *)) {
  // This measures how long it takes to launch your application.
  [self measureWithMetrics:@[[[XCTApplicationLaunchMetric alloc] init]] block:^{
  [[[XCUIApplication alloc] init] launch];
  }];
  }
  }

@end