How can I downsample an image?
显示 更早的评论
Hello
I want to downsample an image and I want to replace one pixel in new Image with average of four pixel in first image.
Could you help me ?
采纳的回答
Walter Roberson
2015-7-2
Letting the image be IM and assuming it is double(),
NewImage = (IM(1:2:end, 1:2:end) + IM(2:2:end, 1:2:end) + IM(1:2:end, 2:2:end) + IM(2:2:end, 2:2:end)) / 4;
3 个评论
bkshn
2015-7-4
Walter Roberson
2015-7-5
This formula processes all pixels in the image at the same time. I just noticed that it will fail if the height or width are odd.
It works by taking the average of the pixels at (I,J), (I+1,J), (I,J+1), (I+1,J+1), doing so for every second row and ever second column.
bkshn
2015-7-8
更多回答（0 个）
类别
在 帮助中心 和 File Exchange 中查找有关 Read, Write, and Modify Image 的更多信息
Community Treasure Hunt
Find the treasures in MATLAB Central and discover how the community can help you!
Start Hunting!
Translated by 
