类 AutoMaskingArgs

AutoMaskingArgs class

表示为自动掩码方法指定的参数。

public class AutoMaskingArgs : IMaskingArgs

构造函数

名称描述
AutoMaskingArgs()默认构造函数。

属性

名称描述
MaxIterationNumber { get; set; }获取或设置最大迭代次数。
NumberOfObjects { get; set; }获取或设置要将初始图像分割成的对象数量（可选），默认值为 2（对象和背景）。
ObjectsPoints { get; set; }获取或设置属于分离对象的点（可选）NumberOfObjects 坐标，这些坐标属于初始图像的 NumberOfObjects 个对象。此参数用于提高分割方法的精度。
ObjectsRectangles { get; set; }获取或设置属于分离对象的对象矩形（可选）。此参数用于提高分割方法的精度。
OrphanedPoints { get; set; }获取或设置不再属于任何对象的点（可选）。此参数仅在重新分割的情况下使用。
Precision { get; set; }获取或设置分割方法的精度（可选）。

示例

本示例展示了如何使用图像掩码和 K 均值分割算法将光栅图像分解为多个图像。图像掩码是一种用于将背景与前景图像对象分离的图像处理技术。

[C#]

string dir = "c:\\temp\\";

using (Aspose.Imaging.RasterImage image = (Aspose.Imaging.RasterImage)Aspose.Imaging.Image.Load(dir + "Blue hills.png"))
{
    Aspose.Imaging.Masking.Options.AutoMaskingArgs args = new Aspose.Imaging.Masking.Options.AutoMaskingArgs();

    // 设置簇的数量（分离的对象）。默认值为 2，即前景对象和背景。
    args.NumberOfObjects = 3;

    // 设置最大迭代次数。
    args.MaxIterationNumber = 50;

    // 设置分割方法的精度（可选）。
    args.Precision = 1;
        
    // 每个簇（段）将保存为单独的 PNG 文件。
    Aspose.Imaging.ImageOptions.PngOptions exportOptions = new Aspose.Imaging.ImageOptions.PngOptions();
    exportOptions.ColorType = Aspose.Imaging.FileFormats.Png.PngColorType.TruecolorWithAlpha;
    exportOptions.Source = new Aspose.Imaging.Sources.StreamSource(new System.IO.MemoryStream());

    Aspose.Imaging.Masking.Options.MaskingOptions maskingOptions = new Aspose.Imaging.Masking.Options.MaskingOptions();

    // 使用 K 均值聚类。
    // K 均值聚类允许将图像拆分为多个独立的簇（段）。
    maskingOptions.Method = Masking.Options.SegmentationMethod.KMeans;
    maskingOptions.Decompose = true;
    maskingOptions.Args = args;
        
    // 背景颜色将为橙色。
    maskingOptions.BackgroundReplacementColor = Aspose.Imaging.Color.Orange;
    maskingOptions.ExportOptions = exportOptions;

    // 创建 ImageMasking 类的实例。
    Aspose.Imaging.Masking.ImageMasking masking = new Aspose.Imaging.Masking.ImageMasking(image);

    // 将源图像划分为多个簇（段）。
    using (Aspose.Imaging.Masking.Result.MaskingResult maskingResult = masking.Decompose(maskingOptions))
    {
        // 从掩码结果中获取图像并保存为 PNG。
        for (int i = 0; i < maskingResult.Length; i++)
        {
            string outputFileName = string.Format("Blue hills.Segment{0}.png", maskingResult[i].ObjectNumber);
            using (Aspose.Imaging.Image resultImage = maskingResult[i].GetImage())
            {
                resultImage.Save(dir + outputFileName);
            }
        }
    }
}

使用分段掩码加速分割过程

[C#]

// 掩码导出选项
Aspose.Imaging.ImageOptions.PngOptions exportOptions = new Aspose.Imaging.ImageOptions.PngOptions();
exportOptions.ColorType = Aspose.Imaging.FileFormats.Png.PngColorType.TruecolorWithAlpha;
exportOptions.Source = new Aspose.Imaging.Sources.StreamSource(new System.IO.MemoryStream());

Aspose.Imaging.Masking.Options.MaskingOptions maskingOptions = new Aspose.Imaging.Masking.Options.MaskingOptions();
    
// 使用 GraphCut 聚类。
maskingOptions.Method = Masking.Options.SegmentationMethod.GraphCut;
maskingOptions.Decompose = false;
maskingOptions.Args = new Aspose.Imaging.Masking.Options.AutoMaskingArgs();

// 背景颜色将变为透明。
maskingOptions.BackgroundReplacementColor = Aspose.Imaging.Color.Transparent;
maskingOptions.ExportOptions = exportOptions;

string dir = "c:\\temp\\";
using (Aspose.Imaging.RasterImage image = (Aspose.Imaging.RasterImage)Aspose.Imaging.Image.Load(dir + "BigImage.jpg"))
{
    Aspose.Imaging.Size imageSize = image.Size;

    // 减小图像尺寸以加速分割过程
    image.ResizeHeightProportionally(600, Aspose.Imaging.ResizeType.HighQualityResample);

    // 创建 ImageMasking 类的实例。
    Aspose.Imaging.Masking.ImageMasking masking = new Aspose.Imaging.Masking.ImageMasking(image);

    // 将源图像划分为多个簇（段）。
    using (Aspose.Imaging.Masking.Result.MaskingResult maskingResult = masking.Decompose(maskingOptions))
    {
        // 获取前景掩码
        using (Aspose.Imaging.RasterImage foregroundMask = maskingResult[1].GetMask()) 
        {
            // 将掩码大小增至原始图像的尺寸
            foregroundMask.Resize(imageSize.Width, imageSize.Height, Aspose.Imaging.ResizeType.NearestNeighbourResample);

            // 将掩码应用于原始图像以获得前景段
            using (Aspose.Imaging.RasterImage originImage = (Aspose.Imaging.RasterImage)Aspose.Imaging.Image.Load(dir + "BigImage.jpg"))
            {
                Aspose.Imaging.Masking.ImageMasking.ApplyMask(originImage, foregroundMask, maskingOptions);
                originImage.Save(dir + "BigImage_foreground.png", exportOptions);
            }
        }
    }
}

本示例展示了如何为图像掩码算法指定建议，以提高分割（聚类）方法的精度。图像掩码是一种用于将背景与前景图像对象分离的图像处理技术。

[C#]

string dir = "c:\\temp\\";

using (Aspose.Imaging.RasterImage image = (Aspose.Imaging.RasterImage)Aspose.Imaging.Image.Load(dir + "Gorilla.bmp"))
{
    Aspose.Imaging.Masking.Options.AutoMaskingArgs args = new Aspose.Imaging.Masking.Options.AutoMaskingArgs();

    // 建议 #1。
    // 对图像进行目视分析并设置感兴趣区域。分割结果将仅包含完全位于该区域内的对象。
    args.ObjectsRectangles = new Rectangle[]
    {
        new Rectangle(86, 6, 270, 364),
    };

    // 建议 #2。
    // 对图像进行视觉分析并设置属于分离对象的点。
    args.ObjectsPoints = new Point[][]
    {
        new Point[] { new Point(103, 326) },
        new Point[] { new Point(280, 43) },
        new Point[] { new Point(319, 86) },
    };

    // 每个簇（段）将保存为单独的 PNG 文件。
    Aspose.Imaging.ImageOptions.PngOptions exportOptions = new Aspose.Imaging.ImageOptions.PngOptions();
    exportOptions.ColorType = Aspose.Imaging.FileFormats.Png.PngColorType.TruecolorWithAlpha;
    exportOptions.Source = new Aspose.Imaging.Sources.StreamSource(new System.IO.MemoryStream());

    Aspose.Imaging.Masking.Options.MaskingOptions maskingOptions = new Aspose.Imaging.Masking.Options.MaskingOptions();
        
    // 使用 GraphCut 聚类。
    maskingOptions.Method = Masking.Options.SegmentationMethod.GraphCut;
    maskingOptions.Decompose = false;
    maskingOptions.Args = args;

    // 背景颜色将为橙色。
    maskingOptions.BackgroundReplacementColor = Aspose.Imaging.Color.Orange;
    maskingOptions.ExportOptions = exportOptions;

    // 创建 ImageMasking 类的实例。
    Aspose.Imaging.Masking.ImageMasking masking = new Aspose.Imaging.Masking.ImageMasking(image);

    // 将源图像划分为多个簇（段）。
    using (Aspose.Imaging.Masking.Result.MaskingResult maskingResult = masking.Decompose(maskingOptions))
    {
        // 从掩码结果中获取图像并保存为 PNG。
        for (int i = 0; i < maskingResult.Length; i++)
        {
            string outputFileName = string.Format("Gorilla.Segment{0}.png", maskingResult[i].ObjectNumber);
            using (Aspose.Imaging.Image resultImage = maskingResult[i].GetImage())
            {
                resultImage.Save(dir + outputFileName);
            }
        }
    }
}

将遮罩会话保存到文件，以便长时间会话以及在其他环境中恢复会话的可能性。

[C#]

string dir = "c:\\temp\\";
string sessionBackupFile = dir + "session.bak";

// 掩码导出选项
Aspose.Imaging.ImageOptions.PngOptions exportOptions = new Aspose.Imaging.ImageOptions.PngOptions();
exportOptions.ColorType = Aspose.Imaging.FileFormats.Png.PngColorType.TruecolorWithAlpha;
exportOptions.Source = new Aspose.Imaging.Sources.StreamSource(new System.IO.MemoryStream());

Aspose.Imaging.Masking.Options.MaskingOptions maskingOptions = new Aspose.Imaging.Masking.Options.MaskingOptions();
    
// 使用 GraphCut 聚类。
maskingOptions.Method = Masking.Options.SegmentationMethod.GraphCut;
maskingOptions.Decompose = false;
maskingOptions.Args = new Aspose.Imaging.Masking.Options.AutoMaskingArgs();

// 背景颜色将为橙色。
maskingOptions.BackgroundReplacementColor = Aspose.Imaging.Color.Orange;
maskingOptions.ExportOptions = exportOptions;

// 首次启动会话并保存到文件
using (Aspose.Imaging.RasterImage image = (Aspose.Imaging.RasterImage)Aspose.Imaging.Image.Load(dir + "Gorilla.bmp"))
{
    // 创建 ImageMasking 类的实例。
    Aspose.Imaging.Masking.ImageMasking masking = new Aspose.Imaging.Masking.ImageMasking(image);

    using (Aspose.Imaging.Masking.IMaskingSession session = masking.CreateSession(maskingOptions))
    {
        using (Aspose.Imaging.Masking.Result.MaskingResult maskingResult = session.Decompose())
        {
            using (Aspose.Imaging.RasterImage segmentImage = maskingResult[1].GetImage())
            {
                segmentImage.Save(dir + "step1.png");
            }
        }

        session.Save(sessionBackupFile);
    }
}

// 从文件恢复遮罩会话
using (Aspose.Imaging.RasterImage image = (Aspose.Imaging.RasterImage)Aspose.Imaging.Image.Load(dir + "Gorilla.bmp"))
{
    // 创建 ImageMasking 类的实例。
    Aspose.Imaging.Masking.ImageMasking masking = new Aspose.Imaging.Masking.ImageMasking(image);

    using (Aspose.Imaging.Masking.IMaskingSession session = masking.LoadSession(sessionBackupFile))
    {
        Aspose.Imaging.Masking.Options.AutoMaskingArgs args = new Aspose.Imaging.Masking.Options.AutoMaskingArgs();

        // 对图像进行视觉分析并设置属于分离对象的点。
        args.ObjectsPoints = new Point[][]
                                     {
                                         new Point[]
                                             {
                                                 new Point(0, 0), new Point(0, 1), new Point(1, 0),
                                                 new Point(1, 1), new Point(2, 0), new Point(2, 1),
                                                 new Point(3, 0), new Point(3, 1)
                                             },
                                     };
        using (Aspose.Imaging.Masking.Result.MaskingResult maskingResult = session.ImproveDecomposition(args))
        {
            // 显式转移导出选项，因为它不可序列化
            maskingResult.MaskingOptions.ExportOptions = exportOptions;

            using (Aspose.Imaging.RasterImage segmentImage = maskingResult[1].GetImage())
            {
                segmentImage.Save(dir + "step2.png");
            }
        }
    }
}

另请参见

类 AssumedObjectData 类 AutoMaskingGraphCutOptions