使用MATLAB,实现编写实现图像全局直方图、局部直方图统计程序、基于直方图的全局均值及方差计算程序、局部方差及方差计算程序、选择性局部图像增强程序
时间: 2024-10-24 15:04:07 浏览: 86
在MATLAB中,你可以通过一些内置函数和自定义函数来实现图像处理相关的各种任务:
1. **图像全局直方图**:可以使用`imhist()`函数获取整幅图像的灰度直方图。例如:
```matlab
img = imread('your_image.jpg'); % 加载图片
histData = imhist(img(:), 256); % 获取灰度直方图数据,256表示256个灰度级别
```
2. **局部直方图统计**:可以使用`regionprops()`或`imlocalmax()`配合`histcounts()`来计算感兴趣区域(ROI)的直方图。例如:
```matlab
roi = ...; % 定义ROI
localHist = histcounts(regionprops(img, 'Intensity', roi), 256);
```
3. **直方图统计的全局均值和方差计算**:
```matlab
globalMean = mean(img(:));
globalVariance = var(img(:));
```
4. **局部方差和方差计算**:同样使用`regionprops()`,提取每个像素邻域的方差:
```matlab
localVar = cellfun(@(x) var(x.Intensity), regionprops(img, 'PixelList'), 'UniformOutput', false);
```
5. **选择性局部图像增强**:可以利用直方图的信息调整局部亮度、对比度等。如使用`imadjust()`进行局部直方图均衡化:
```matlab
enhancedImg = imadjust(img, [min(localHist) max(localHist)], []);
```
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