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【单选题】
在灰度线性变换 s=ar+b中，要使输出图像对比度降低，则：题目分析：线性变换，对比度降低，就是把灰度值范围进行线性压缩，s=ar+b这是一条以a为斜率的直线（r是输入灰度值，s是输出灰度值），参数b只是截距，与压缩拉伸灰度值无关，那么只能考虑a的问题。a=1，说明斜率未变，s和r的范围相同。a>1，说明斜率变大了，s的范围比r大，灰度值拉伸了。a<1，说明斜率变小，s比r的范围变小，也就是灰度值压缩了。A.
a>1
B.
a<1< /div>
C.
a=1
D.
b>1
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