如何减少图像处理中的图像大小（scipy / numpy / python） [英] How to reduce an image size in image processing (scipy/numpy/python)

问题描述

你好我有一个图像（1024 x 1024），我在numpy中使用fromfile命令将该图像的每个像素放入一个矩阵。

Hello I have an image ( 1024 x 1024) and I used "fromfile" command in numpy to put every pixel of that image into a matrix.

怎么能我通过修改矩阵来减小图像的大小（例如512 x 512）？

How can I reduce the size of the image ( ex. to 512 x 512) by modify that matrix a?

a = numpy.fromfile(( - path - ,'uint8').reshape((1024,1024))

我有不知道如何修改矩阵a以减小图像的大小。所以，如果有人有任何想法，请分享您的知识，我将不胜感激。谢谢

I have no idea how to modify the matrix a to reduce the size of the image. So if somebody has any idea, please share your knowledge and I will be appreciated. Thanks

编辑：

当我看到结果时，我发现读者已经阅读了图像并将其放入矩阵。所以我将数组更改为矩阵。

When I look at the result, I found that the reader I got read the image and put it into a "matrix". So I changed the "array" to matrix.

何塞告诉我，我只能采用偶数列甚至行并将其放入一个新矩阵。将图像缩小到一半。我需要使用scipy / numpy中的哪个命令来执行此操作？

Jose told me I can take only even column and even row and put it into a new matrix . That will reduce the image to half size. What command in scipy/numpy do I need to use to do that?

谢谢

推荐答案

我是nk最简单的方法是只取一些列和一些图像行。制作一个数组样本。例如，只有那些偶数行和偶数列，将它放在一个新的数组中，你将有一个半尺寸的新图像。

I think the easyiest way is to take only some columns and some rows of the image. Makeing a sample of the array. Take for example, only those even rows and the even columns, put it in a new array and you would have a half size new image.

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