Increasing the resolution of a grayscale image 16-times the original

Question

med-sweng 2013-11-16

0
链接

此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/106388-increasing-the-resolution-of-a-grayscale-image-16-times-the-original

评论： Image Analyst 2013-11-16

Say that you were required to increase the resolution of a `grayscale` image by `16` times. How would that be done in `MATLAB`?

Thanks.

0 个评论
显示 -2更早的评论隐藏 -2更早的评论

请先登录，再进行评论。

请先登录，再回答此问题。

Answer 1

Image Analyst 2013-11-16

1
链接

此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/106388-increasing-the-resolution-of-a-grayscale-image-16-times-the-original#answer_115413

在 MATLAB Online 中打开

To increase the number of pixels in the image by 16 in each dimension:

bigImage = imresize(originalImage, 16);

2 个评论
显示无隐藏无

med-sweng 2013-11-16

@ImageAnalyst. Thanks for your reply. So, does increasing the number of pixels in the image by `16` refer to the same meaning as increasing the resolution of the image by * 16 times * ? When someone says increasing the image 16 times in resolution, you feel it is more than just adding 16-pixels to each dimension. Am I wrong here?

Image Analyst 2013-11-16

Increasing the number of pixels will not increase the spatial resolution of your image anywhere except in Hollywood. You simply have more pixels, not more resolving power. Computer people talk of resolution in terms of how many pixels it has. Optics people (like me) talk about resolution in terms of how small are the details in the image that you can see. If you have a shot of a person sitting on a cliff a half mile away, then increasing the number of pixels by 16 will make the person larger but can't increase the spatial resolution so all you'll have is a larger but still very blurry picture of the person. You will not suddenly be able to see facial features, etc. if you couldn't in the original image. You can do spatial filtering to increase the resolution if you know the point spread function - it will improve resolution but it's not perfect and there's a limit to how much it can get improved.

请先登录，再进行评论。