MaskingOptions

MaskingOptions class

代表常用的图像遮罩选项。

public class MaskingOptions

构造函数

姓名描述
MaskingOptions()默认构造函数。

特性

姓名描述
Args { get; set; }获取或设置分段算法的参数。
BackgroundReplacementColor { get; set; }获取或设置背景替换颜色。
Decompose { get; set; }获取或设置一个值，该值指示 是否不需要将每个Shape 从蒙版中分离为单独的对象，或者作为与背景分离的蒙版中的联合对象。
ExportOptions { get; set; }获取或设置图像导出选项。
MaskingArea { get; set; }获取或设置遮蔽区域。
Method { get; set; }获取或设置分割方法。

字段

姓名描述
const BackgroundObjectNumber背景物体编号

例子

此示例说明如何使用图像掩蔽和 K-means 分割算法将光栅图像分解为多个图像。图像遮罩是一种图像处理技术，用于将背景与前景图像对象分开。

[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（分离对象）的数量。默认值为 2，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）将被存储到一个单独的 PNG 文件中。
    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-means 聚类。
    // K-means 聚类允许将图像分割成几个独立的簇（段）。
    maskingOptions.Method = Masking.Options.SegmentationMethod.KMeans;
    maskingOptions.Decompose = true;
    maskingOptions.Args = args;
        
    // 背景颜色为橙色。
    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);

    // 将源图像分成几个簇（段）。
    using (Aspose.Imaging.Masking.Result.MaskingResult maskingResult = masking.Decompose(maskingOptions))
    {
        // 从遮罩结果中获取图像并将其保存为 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);
            }
        }
    }
}

使用分段掩码加快分段过程

[C#]

// 屏蔽导出选项
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();

// 背景颜色将是透明的。
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;

    // 减小图像大小以加快分割过程
    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);

    // 将源图像分成几个簇（段）。
    using (Aspose.Imaging.Masking.Result.MaskingResult maskingResult = masking.Decompose(maskingOptions))
    {
        // 获取前景蒙版
        using (Aspose.Imaging.RasterImage foregroundMask = maskingResult[1].GetMask()) 
        {
            // 将蒙版的大小增加到原始图像的大小
            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);
            }
        }
    }
}

此示例说明如何使用图像遮罩和手动遮罩将光栅图像分解为多个图像。图像遮罩是一种图像处理技术，用于将背景与前景图像对象分开。

[C#]

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

// 定义手动掩码。
Aspose.Imaging.GraphicsPath manualMask = new Aspose.Imaging.GraphicsPath();
Aspose.Imaging.Figure figure = new Aspose.Imaging.Figure();
figure.AddShape(new Aspose.Imaging.Shapes.EllipseShape(new RectangleF(50, 50, 40, 40)));
figure.AddShape(new Aspose.Imaging.Shapes.RectangleShape(new RectangleF(10, 20, 50, 30)));
manualMask.AddFigure(figure);

// 每个簇（段）将被存储到一个单独的 PNG 文件中。
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());

// 设置手动掩码。
Aspose.Imaging.Masking.Options.ManualMaskingArgs args = new Aspose.Imaging.Masking.Options.ManualMaskingArgs();
args.Mask = manualMask;

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

    // 使用手动聚类算法。
    maskingOptions.Method = Masking.Options.SegmentationMethod.Manual;

    // 构成蒙版的所有形状都将合并为一个。 
    maskingOptions.Decompose = false;
    maskingOptions.Args = args;

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

    // 将应用遮罩的源图像区域。
    maskingOptions.MaskingArea = new Rectangle(50, 50, 120, 120);

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

    // 将源图像分成几个簇（段）。
    using (Aspose.Imaging.Masking.Result.MaskingResult maskingResult = masking.Decompose(maskingOptions))
    {
        // 从遮罩结果中获取图像并将其保存为 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);
            }
        }
    }
}

此示例说明如何为图像掩蔽算法指定建议以提高分割（聚类）方法的精度。图像遮罩是一种图像处理技术，用于将背景与前景图像对象分开。

[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。
    // 对图像进行可视化分析并设置感兴趣的区域。分割结果将仅包括将完全位于该区域内的对象。
    args.ObjectsRectangles = new Rectangle[]
    {
        new Rectangle(86, 6, 270, 364),
    };

    // 建议 #2。
    // 对图像进行可视化分析，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）将被存储到一个单独的 PNG 文件中。
    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);

    // 将源图像分成几个簇（段）。
    using (Aspose.Imaging.Masking.Result.MaskingResult maskingResult = masking.Decompose(maskingOptions))
    {
        // 从遮罩结果中获取图像并将其保存为 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);
            }
        }
    }
}

将屏蔽会话保存到文件以用于长时间会话，以及在另一个环境中恢复会话的可能性。

[C#]

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

// 屏蔽导出选项
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);
    }
}

// 从文件恢复屏蔽会话
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();

        // 对图像进行可视化分析，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))
        {
            // 导出选项的显式传输，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");
            }
        }
    }
}

也可以看看

ManualMaskingArgs SegmentationMethod