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拍摄，自从智能手机普及之后就已经不再是小众爱好，使用手机拍摄记录生活几乎成了人们的日常。在巨量的需求下，美颜工具、美颜SDK已经被广泛应用于各大视频拍摄平台。虽然经常听到美颜SDK，但是大多数人并不了解它，下文小编就为大家深度讲解一下。

一、关键技术

1、人脸识别
它是一项根据人脸特征用于身份识别的生物技术。通过摄像头或者摄像机采集的面部信息，然后在已存储的照片中检测和匹配人脸，从而进行身份识别的技术。

2、人脸美化
人脸美化也是美颜SDK基于AI技术的一大创新，随着人们审美水平的不断提高，对照相质量的要求也越来越高。后期处理已经无法满足广大爱美人士的需求，实时人像处理也就应运而生。人脸美化技术可以在保留人物面部特征的情况下，对人像进行差异化一键美化处理，这项技术被广泛应用于美颜sdk中，这项技术现在受到越来越多人的喜爱。

二、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