使用Matlab的bitget（）选择8位平面。显示8位平面？

Question

我正在尝试使此代码正常工作，但我无法解决问题...

img = imread('cameraman.tif');

for i = 1:8
    a{i}=bitget(img,i);
    subplot(2,4,i), imshow(logical(a{i})), title('Bit plane');
end

输出错误是

Unable to perform assignment because brace indexing is not supported for variables of this type.
    Error in (line 15)
        a{i}=bitget(img,i);

您看到问题出在哪里吗？谢谢

Answer 1

该错误消息表明a不支持大括号索引。这意味着在运行代码之前，a已经被定义。

要编写可靠的代码，应始终初始化所有变量。在这种情况下，请在循环前写入a = {};。这样可以确保a的类型正确。

更好的方法是预先分配a使其具有正确的大小，这样就不会在每次循环迭代时都调整其大小：

a = cell(8,1);

Answer 2

我使用 MATLAB 进行了 8位平面的工作，这是我的代码供您参考：）

class SellPageViewModel : ViewModelBase
{
    public SellPageViewModel()
    {
        Vehicle = new Vehicle();
        SaveVehicleCommand = new Command(SaveVehicle);
        SetNewCommand = new Command(SetNew);
        SetUsedCommand = new Command(SetUsed);
    }

    private Vehicle vehicle;

    public Vehicle Vehicle
    {
        get { return vehicle; }
        set
        {
            SetProperty(ref vehicle, value);
            Console.WriteLine("Vehicle details entered");
        }
    }

    private object categorySelection;

    public object CategorySelection
    {
        get { return categorySelection; }
        set
        {
            SetProperty(ref categorySelection, value);
            Category catToInt = (Category)value;
            if (value != null)
                Vehicle.CategoryId = catToInt.Id;
            
        }
    }

    private int selectIndex;
    public int SelectIndex
    {
        get { return selectIndex; }
        set
        {
            if (value != -1)
                SetProperty(ref selectIndex, value);
        }
    }



    public Command SetNewCommand { get; }
    public Command SetUsedCommand { get; }
    public Command SaveVehicleCommand { get; }

    void SetNew()
    {
        Vehicle.Condition = "New";
    }

    void SetUsed()
    {
        Vehicle.Condition = "Used";
    }
    async void SaveVehicle()
    {
        Console.WriteLine("Save Button Clicked");
        Console.WriteLine(Vehicle.Title);
        Console.WriteLine(Vehicle.Price);
        Console.WriteLine(Vehicle.CategoryId);
        Console.WriteLine(Vehicle.Condition);


        SelectIndex = 0;

        Vehicle = new Vehicle();
        
        
    }
}