python Numpy 图像 - 将矩阵旋转 270 度
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Numpy image - rotate matrix 270 degrees
提问by Mikesname
I've got a Numpy 2d array that represents a grey-scale image and I need to rotate it 270 degrees. Might be being a bit thick here but the two ways I can find to do this seem quite... circulous:
我有一个代表灰度图像的 Numpy 2d 数组，我需要将它旋转 270 度。这里可能有点厚，但我能找到的两种方法似乎很......循环：
rotated = numpy.rot90(numpy.rot90(numpy.rot90(orignumpyarray)))
rotated = numpy.fliplr(numpy.flipud(numpy.rot90(orignumpyarray)))
I'm thinking there must be a better way to do this in one operation. Basically a rot270() function? Any ideas?
我认为必须有更好的方法在一次操作中做到这一点。基本上是一个 rot270() 函数？有任何想法吗？
回答by Anders Lindahl
You can tell rot90to rotate several times, this should work:
你可以告诉rot90给旋转几次，这应该工作：
rotated = numpy.rot90(orignumpyarray,3)
回答by Krunal Degamdiya
rotated_array =numpy.rot90(orignumpyarray,3)
Explanation of the function:
功能说明：
numpy.rot90(a,b)
a =Array which you want to rotate
b =How many times you want to rotate it by 90 degrees. For here you want 270° so
90° * 3 = 270° that is why b = 3 here.
numpy.rot90(a,b)
a =要旋转的数组
b =要旋转 90 度的次数。因为这里你想要 270° 所以 90° * 3 = 270° 这就是为什么这里 b = 3。
