创建一个程序读入并显示一幅图像 a. 允许用户在图像中选择一个矩形区域，然后通过按住鼠标画一个矩形。当鼠标放开，高亮显示矩形框，注意，在内存中保留一个原始图像的副本，以防止修改图像时改变原始图像的数据。在下一次点击鼠标按键是，恢复图像并重新开始绘制矩形 b. 在另一个独立的窗口中，使用画图函数画一个图表，分别用蓝、绿和红色表示选中每种颜色的像素数量。这是选定区域的颜色直方图。x 坐标系表示像素值范围在0-31，32-63……，223-255，y 坐标表示在选定区域中对应像素的数量。对每一个颜色通道（BGR）

ex4_8.cpp

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