我测试了一下，直接传参的方式传递pixelMap确实不行，pixelMap是程序中真实的是内存地址，跨模块可能会有问题，可以采用共享内存或者文件路径的方式实现，我写了一个示例代码，可以参考一下：

import { image } from '@kit.ImageKit';

@Entry
@Component
struct TestHsp {
  @State message: string = 'Hello World';

  build() {
    Column() {
      Row() {
        SymbolGlyph($r("sys.symbol.arrow_left")).onClick(() => {
          this.getUIContext().getRouter().back()
        })
      }.width('100%').justifyContent(FlexAlign.Start)
      Row(){
        Button("打开HSP").onClick(()=>{
          let file = this.getUIContext().getHostContext()?.filesDir+"/"+"test.jpg"
          let imageSource = image.createImageSource(file)
          let pixelMap = imageSource.createPixelMapSync()
          AppStorage.setOrCreate('HspSharedPixelMap', pixelMap);
          this.getUIContext().getRouter().pushUrl({
            url: '@bundle:cn.com.demos/myHsp/ets/pages/Index',
            params: {
              filePath:file,
            }
          }).catch((err: BusinessError) => {
            console.error(`跳转失败, code: ${err.code}, message: ${err.message}`);
          });

        })
      }
    }
  }
}

HSP代码：

@Entry
@Component
struct Index {

  @State fileName:string=""

  @StorageLink("HspSharedPixelMap") image:PixelMap|undefined=undefined


  aboutToAppear(): void {
    const params = this.getUIContext().getRouter().getParams() as Record<string, Object>;

    if(params && params['filePath']){
      this.fileName = params['filePath'] as string
      console.log(`${this.fileName}`)
    }
  }

  build() {
    Column() {
      Image(this.image).width(200).height(200).objectFit(ImageFit.Contain)
      Image("file://"+this.fileName).width(200).height(200).objectFit(ImageFit.Contain)
      Button("返回").onClick(()=>{
        this.getUIContext().getRouter().back()
      })
    }
    .width('100%').height('100%')
  }
}