Use of square brackets

5 次查看（过去 30 天）
Lab Rat
Lab Rat 2012-11-25
I know this sounds a silly question, but what is the difference between using imshow(X); and using imshow(X,[]); ? For some images, I'm unable to display them using the first command.

请先登录，再回答此问题。

回答（1 个）

Image Analyst
Image Analyst 2012-11-25
You use [] to scale the image to the range 0-255. This will maximize the contrast. If you have a double or single image, then it expects the range to be 0-1. If your image is not in that range, then it will show as all white or all black depending on if it's more than 1 or less than 1. For example, if your image goes from -242.99 to +5782.123, then it will set -242.99 to 0, and 5782.123 to 255 and linearly scale everything in between.
  2 个评论
Lab Rat
Lab Rat 2012-11-26
Thanks. Is there any MATLAB function that will autoscale a double image back to the minimum as 0 and maximum as 1 ? Or do I have to use X = X - min(X); X = X/max(X); ?
Image Analyst
Image Analyst 2012-11-26
You can look into imadjust() or mat2gray().

请先登录，再进行评论。

类别

在 Help Center 和 File Exchange 中查找有关 Image Processing Toolbox 的更多信息

标签

Community Treasure Hunt

Find the treasures in MATLAB Central and discover how the community can help you!

Start Hunting!

Translated by