matlab app中小波包热力图实现代码

下面是一个简单的MATLAB App示例，用于实现小波包热力图。该示例使用了MATLAB的小波包分析工具箱，并使用了MATLAB App Designer。

1. 创建一个新的MATLAB App，并将布局设置为"Grid Layout"。将布局分为两个区域，一个用于显示小波包热力图，另一个用于控制小波包分析参数。

2. 在控制区域中添加一个下拉菜单，用于选择小波包分析的基函数。添加一个滑块，用于设置小波包分析的层数。添加一个按钮，用于更新小波包热力图。

3. 在小波包分析函数中，使用下拉菜单和滑块的值来设置小波包分析的参数。使用小波包分析工具箱中的函数进行小波包分析，并将结果保存在一个矩阵中。

4. 使用MATLAB的热力图函数将小波包矩阵显示为热力图。在热力图上添加一个色条，用于显示不同的颜色代表的值。

下面是一个MATLAB App示例的代码，用于实现小波包热力图：

classdef WaveletApp < matlab.apps.AppBase

    % Properties that correspond to app components
    properties (Access = public)
        UIFigure          matlab.ui.Figure
        GridLayout        matlab.ui.container.GridLayout
        HeatmapAxes        matlab.ui.control.UIAxes
        ControlPanel      matlab.ui.container.GridLayout
        WaveletTypeLabel  matlab.ui.control.Label
        WaveletTypeMenu   matlab.ui.control.DropDown
        WaveletLevelLabel matlab.ui.control.Label
        WaveletLevelSlider matlab.ui.control.Slider
        UpdateButton      matlab.ui.control.Button
    end

    properties (Access = private)
        WaveletMatrix     % Matrix for storing wavelet packet coefficients
    end

    % Callbacks that handle component events
    methods (Access = private)

        % Button pushed function: UpdateButton
        function UpdateButtonPushed(app, event)
            % Get wavelet packet parameters from UI
            waveletType = app.WaveletTypeMenu.Value;
            waveletLevel = app.WaveletLevelSlider.Value;

            % Compute wavelet packet coefficients
            [C, L] = wavedec2(app.ImageData, waveletLevel, waveletType);
            app.WaveletMatrix = wpcoef(wcodemat(C,255),L,waveletType);

            % Update heatmap
            imagesc(app.HeatmapAxes, app.WaveletMatrix);
            colormap(app.HeatmapAxes, jet);
            colorbar(app.HeatmapAxes);
        end

        % Value changed function: WaveletLevelSlider
        function WaveletLevelSliderValueChanged(app, event)
            value = app.WaveletLevelSlider.Value;
            app.WaveletLevelLabel.Text = ['Wavelet Level (' num2str(value) ')'];
        end

        % Close request function: UIFigure
        function UIFigureCloseRequest(app, event)
            delete(app);
        end
    end

    % App initialization and construction
    methods (Access = private)

        % Create UIFigure and components
        function createComponents(app)
            % Create UIFigure and configure properties
            app.UIFigure = uifigure('Visible', 'off');
            app.UIFigure.Position = [100 100 640 480];
            app.UIFigure.Name = 'Wavelet Packet Heatmap';

            % Create GridLayout
            app.GridLayout = uigridlayout(app.UIFigure);
            app.GridLayout.ColumnWidth = {'1x', '1x'};
            app.GridLayout.RowHeight = {'1x'};

            % Create HeatmapAxes
            app.HeatmapAxes = uiaxes(app.GridLayout);
            title(app.HeatmapAxes, 'Wavelet Packet Heatmap');
            xlabel(app.HeatmapAxes, 'Horizontal');
            ylabel(app.HeatmapAxes, 'Vertical');
            app.HeatmapAxes.XTick = [];
            app.HeatmapAxes.YTick = [];
            app.HeatmapAxes.Box = 'on';
            app.HeatmapAxes.Position = [1 1 1 1];

            % Create ControlPanel
            app.ControlPanel = uigridlayout(app.GridLayout);
            app.ControlPanel.RowHeight = {25, 25, '1x'};
            app.ControlPanel.ColumnWidth = {150, '1x'};
            app.ControlPanel.Layout.Row = 1;
            app.ControlPanel.Layout.Column = 2;

            % Create WaveletTypeLabel
            app.WaveletTypeLabel = uilabel(app.ControlPanel);
            app.WaveletTypeLabel.HorizontalAlignment = 'right';
            app.WaveletTypeLabel.Layout.Row = 1;
            app.WaveletTypeLabel.Layout.Column = 1;
            app.WaveletTypeLabel.Text = 'Wavelet Type';

            % Create WaveletTypeMenu
            app.WaveletTypeMenu = uidropdown(app.ControlPanel);
            app.WaveletTypeMenu.Items = {'haar', 'db1', 'db2', 'db3', 'db4', 'db5'};
            app.WaveletTypeMenu.ValueChangedFcn = createCallbackFcn(app, @UpdateButtonPushed, true);
            app.WaveletTypeMenu.Layout.Row = 1;
            app.WaveletTypeMenu.Layout.Column = 2;
            app.WaveletTypeMenu.Value = 'haar';

            % Create WaveletLevelLabel
            app.WaveletLevelLabel = uilabel(app.ControlPanel);
            app.WaveletLevelLabel.HorizontalAlignment = 'right';
            app.WaveletLevelLabel.Layout.Row = 2;
            app.WaveletLevelLabel.Layout.Column = 1;
            app.WaveletLevelLabel.Text = 'Wavelet Level (1)';

            % Create WaveletLevelSlider
            app.WaveletLevelSlider = uislider(app.ControlPanel);
            app.WaveletLevelSlider.Limits = [1 10];
            app.WaveletLevelSlider.ValueChangedFcn = createCallbackFcn(app, @WaveletLevelSliderValueChanged, true);
            app.WaveletLevelSlider.Layout.Row = 2;
            app.WaveletLevelSlider.Layout.Column = 2;

            % Create UpdateButton
            app.UpdateButton = uibutton(app.ControlPanel, 'push');
            app.UpdateButton.ButtonPushedFcn = createCallbackFcn(app, @UpdateButtonPushed, true);
            app.UpdateButton.Layout.Row = 3;
            app.UpdateButton.Layout.Column = [1 2];
            app.UpdateButton.Text = 'Update Heatmap';

            % Show the figure after all components are created
            app.UIFigure.Visible = 'on';
        end

        % App initialization
        function appInit(app)
            % Load default image
            app.ImageData = imread('peppers.png');

            % Perform initial wavelet packet analysis
            app.WaveletTypeMenu.Value = 'db2';
            app.WaveletLevelSlider.Value = 4;
            app.UpdateButtonPushed();
        end
    end

    % App creation and deletion
    methods (Access = public)

        % Construct app
        function app = WaveletApp()
            % Create UIFigure and components
            createComponents(app)

            % Initialize app
            appInit(app)
        end

        % Code that executes before app deletion
        function delete(app)

            % Delete UIFigure when app is deleted
            delete(app.UIFigure)
        end
    end
end

这是一个简单的示例，用于演示如何在MATLAB App中实现小波包热力图。可以根据具体需要进行修改和扩展。