Intelligent Media Management：點雲壓縮

壓縮資訊

• 專案名稱：test-project

• 點雲檔案的OSS地址：oss://test-bucket/test-object.pcd

• 壓縮演算法：Octree

• 輸出檔案的OSS地址：oss://test-bucket/test-target-object

壓縮演算法簡介

八叉樹（Octree）是一種常用的壓縮演算法，主要用於三維資料的壓縮和表示。它將三維空間劃分為一系列等大小的立方體，每個立方體被劃分為八個子立方體，這些子立方體又可以進一步劃分為更小的子立方體，以此類推。

八叉樹通過只儲存包含有效資料的節點，可以顯著減少儲存空間。常用於點雲資料、體積資料等三維資料的壓縮和表示。通過適當選擇劃分策略和合并策略，可以在保持資料精度的同時減小儲存和傳輸開銷。

請求樣本

{
    "ProjectName": "test-project",
    "SourceURI": "oss://test-bucket/test-object.pcd",
    "UserData": "{\"ID\":\"testuid\",\"Name\": \"test-user\",\"Avatar\": \"http://test.com/testuid\"}",
    "TargetURI": "oss://test-bucket/test-target-object",
    "PointCloudFileFormat": "pcd",
    "CompressMethod": "octree",
    "PointCloudFields": "[\"xyz\"]",
    "OctreeOption": "{\"PointResolution\": 0.001, \"OctreeResolution\": 0.01, \"DoVoxelGridDownDownSampling\": false, \"LibraryName\": \"pcl\"}",
    "KdtreeOption": "{\"CompressionLevel\": 8, \"QuantizationBits\": 10, \"LibraryName\": \"draco\"}"
}

返回樣本

{
    "TaskId": "PointCloudCompress-091d9b4a-8726-47bf-b699-d24c7daff63c",
    "RequestId": "8B0EEA2E-35FE-500F-BCDB-E2E7CA11DF7A",
    "EventId": "180-1S7Q8gHbVXJf2lekgesKvlNM1VR"
}

範例程式碼

以Python SDK為例，點雲壓縮的完整範例程式碼如下。

# -*- coding: utf-8 -*-
# This file is auto-generated, don't edit it. Thanks.
import os
import sys

from typing import List

from alibabacloud_imm20200930.client import Client as imm20200930Client
from alibabacloud_tea_openapi import models as open_api_models
from alibabacloud_imm20200930 import models as imm_20200930_models
from alibabacloud_tea_util import models as util_models
from alibabacloud_tea_util.client import Client as UtilClient


class Sample:
    def __init__(self):
        pass

    @staticmethod
    def create_client(
        access_key_id: str,
        access_key_secret: str,
    ) -> imm20200930Client:
        """
        使用AccessKey ID&AccessKey Secret初始化帳號Client。
        @param access_key_id:
        @param access_key_secret:
        @return: Client
        @throws Exception
        """
        config = open_api_models.Config(
            access_key_id=access_key_id,
            access_key_secret=access_key_secret
        )
        # 填寫訪問的IMM網域名稱。
        config.endpoint = f'imm.cn-beijing.aliyuncs.com'
        return imm20200930Client(config)

    @staticmethod
    def main(
        args: List[str],
    ) -> None:
        # 阿里雲帳號AccessKey擁有所有API的存取權限，建議您使用RAM使用者進行API訪問或日常營運。
        # 強烈建議不要把AccessKey ID和AccessKey Secret儲存到工程代碼裡，否則可能導致AccessKey泄露，威脅您帳號下所有資源的安全。
        # 本樣本通過從環境變數中讀取AccessKey，來實現API訪問的身分識別驗證。
        imm_access_key_id = os.getenv("AccessKeyId")
        imm_access_key_secret = os.getenv("AccessKeySecret")
        client = Sample.create_client(imm_access_key_id, imm_access_key_secret)
        octree_option = imm_20200930_models.OctreeOption(
            point_resolution=0.001,
            octree_resolution=0.01,
            do_voxel_grid_down_down_sampling=False,
            library_name='pcl'
        )
        create_compress_point_cloud_task_request = imm_20200930_models.CreateCompressPointCloudTaskRequest(
            source_uri='oss://test-bucket/test-object.pcd',
            target_uri='oss://test-bucket/test-target-object',
            point_cloud_file_format='pcd',
            compress_method='octree',
            point_cloud_fields=[
                '[\"xyz\"]'
            ],
            project_name='test-project',
            octree_option=octree_option
        )
        runtime = util_models.RuntimeOptions()
        try:
            # 複製代碼運行請自行列印API的傳回值。
            client.create_compress_point_cloud_task_with_options(create_compress_point_cloud_task_request, runtime)
        except Exception as error:
            # 如有需要，請列印錯誤資訊。
            UtilClient.assert_as_string(error.message)

    @staticmethod
    async def main_async(
        args: List[str],
    ) -> None:
        # 阿里雲帳號AccessKey擁有所有API的存取權限，建議您使用RAM使用者進行API訪問或日常營運。
        # 強烈建議不要把AccessKey ID和AccessKey Secret儲存到工程代碼裡，否則可能導致AccessKey泄露，威脅您帳號下所有資源的安全。
        # 本樣本通過從環境變數中讀取AccessKey，來實現API訪問的身分識別驗證。
        imm_access_key_id = os.getenv("AccessKeyId")
        imm_access_key_secret = os.getenv("AccessKeySecret")
        client = Sample.create_client(imm_access_key_id, imm_access_key_secret)
        octree_option = imm_20200930_models.OctreeOption(
            point_resolution=0.001,
            octree_resolution=0.01,
            do_voxel_grid_down_down_sampling=False,
            library_name='pcl'
        )
        create_compress_point_cloud_task_request = imm_20200930_models.CreateCompressPointCloudTaskRequest(
            source_uri='oss://test-bucket/test-object.pcd',
            target_uri='oss://test-bucket/test-target-object',
            point_cloud_file_format='pcd',
            compress_method='octree',
            point_cloud_fields=[
                '[\"xyz\"]'
            ],
            project_name='test-project',
            octree_option=octree_option
        )
        runtime = util_models.RuntimeOptions()
        try:
            # 複製代碼運行請自行列印API的傳回值。
            await client.create_compress_point_cloud_task_with_options_async(create_compress_point_cloud_task_request, runtime)
        except Exception as error:
            # 如有需要，請列印錯誤資訊。
            UtilClient.assert_as_string(error.message)


if __name__ == '__main__':
    Sample.main(sys.argv[1:])