This is a background replacement case based on AI basic visual services. After selecting an image from the device's photo album, it performs intelligent segmentation on the subject and supports dynamically changing the background color

// Keep the original code provided by the user intact here import { photoAccessHelper } from '@kit.MediaLibraryKit' import { fileIo } from '@kit.CoreFileKit' import image from '@ohos.multimedia.image' import { subjectSegmentation } from '@kit.CoreVisionKit' import { promptAction } from '@kit.ArkUI'

@Entry @ComponentV2 struct SubjectSegmentation { @Local chooseImage?: PixelMap @Local segmentedImage?: PixelMap @Local bgColor: ResourceColor = Color.White

  async segmentImage() {
    if (canIUse('SystemCapability.AI.Vision.SubjectSegmentation')) {
      const photoPicker: photoAccessHelper.PhotoViewPicker = new photoAccessHelper.PhotoViewPicker();
      const photoResult = await photoPicker.select({
        MIMEType: photoAccessHelper.PhotoViewMIMETypes.IMAGE_TYPE,
        maxSelectNumber: 1
      })
      const photoUri = photoResult.photoUris[0]
      const fileSource = await fileIo.open(photoUri, fileIo.OpenMode.READ_ONLY);
      const imageSource = image.createImageSource(fileSource.fd);
      this.chooseImage = await imageSource.createPixelMap();
      const visionInfo: subjectSegmentation.VisionInfo = {
        pixelMap: this.chooseImage,
      };
      try {
        const result = await subjectSegmentation.doSegmentation(visionInfo, {
          enableSubjectForegroundImage: true
        })
        this.segmentedImage = result.fullSubject.foregroundImage
      } catch (e) {
        promptAction.showToast({ message: e.message })
      }
    }
  }

  build() {
    Column({ space: 20 }) {
      Text('Original Image:')
      Image(this.chooseImage)
        .objectFit(ImageFit.Fill)
        .height('30%')
      Text('Background Removed:')
      Image(this.segmentedImage)
        .objectFit(ImageFit.Fill)
        .height('30%')
        .backgroundColor(this.bgColor)
      Button('Select Image')
        .onClick(() => this.segmentImage())
      Button('Change Background')
        .onClick(() => {
          const a = Math.round(Math.random() * 255)
          const b = Math.round(Math.random() * 255)
          const c = Math.round(Math.random() * 255)
          this.bgColor = `rgb(${a},${b},${c})`
        })
    }
    .padding(15)
    .height('100%')
    .width('100%')
  }
}