清空筛选条件
清空筛选条件

Code about getting different features from the image

2 次查看（过去 30 天）
Ayesha
Ayesha 2014-1-29
评论： Image Analyst 2014-1-30
Hello everyone,
I have attached an image which is basically the output of my code. It performs in the same way as dwt2 function does except that I have written it myself this time. I've been wondering: why is the background black while it should be grey. What are your intuitive thoughts at the first look?

请先登录，再回答此问题。

采纳的回答

Image Analyst
Image Analyst 2014-1-29
It may be a uint8 image. They clip negative numbers so the lowest you get is 0. So you're seeing only the positive numbers, and they're dark. If you have an image that went from, say, -5 to +5 doing imshow(doubleImage) will show only values from 0 to +5 and they'll be 0 to +5. If you use imshow(doubleImage, []) then it will scale so that -5 shows as 0, +5 shows as 255 (brightest white), and 0 (which is in the middle) will show as 128, which is the gray you were expecting.
  6 个评论
显示 4更早的评论

请先登录，再进行评论。

更多回答（0 个）

类别

在 Help Center 和 File Exchange 中查找有关 Discrete Multiresolution Analysis 的更多信息

标签

产品

Community Treasure Hunt

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

Start Hunting!

Translated by