题目内容
（请给出正确答案）
A.影像较暗，对比度较大
B.影像较亮，对比度较大
C.影像较暗，对比度较小
D.影像较亮，对比度较小
参考答案
简答题官方参考答案
（由简答题聘请的专业题库老师提供的解答）
网友提供的答案
更多“一幅影像的直方图均值较小而方差较大，意味着（）。”相关的问题
B．直方图的小山越靠右,图像越亮。小山越靠左,图像越暗。
C．从直方图分布上,可以判断一幅图像的亮度状态和存在的问题。
D．直方图没有什么实际用处,处理图片时可以不管直方图。
A．空间冗余
B．时间冗余
C．信息熵冗余
D．视觉冗余
Please translate this passage into Chinese： In general terms, an image is a digital picture or representation of an object. Remotely sensed image data are digital representations of the Earth. Image data are stored in data files, also called image files, on magnetic tapes, computer disks, or other media. The data consist only of numbers. These representations form images when they are displayed on a screen or are output to hardcopy. Each number in an image file is a data file value. Data file values are sometimes referred to as pixels. The term pixel is abbreviated from picture element. A pixel is the smallest part of a picture (the area being scanned) with a single value. The data file value is the measured brightness value of the pixel at a specific wavelength. Raster image data are laid out in a grid similar to the squares on a checkerboard. Each cell of the grid is represented by a pixel, also known as a grid cell. In remotely sensed image data, each pixel represents an area of the Earth at a specific location. The data file value assigned to that pixel is the record of reflected radiation or emitted heat from the Earth’s surface at that location.
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请使用3´3模板对其进行中值滤波处理，写出处理过程和结果，注意边缘像素不处理。
