清空筛选条件
清空筛选条件

[~, lowMap] = histeq(gra​yImage(bin​aryImageLo​w));

6 次查看（过去 30 天）
Maria
Maria 2013-7-3
what does the above code do ? and what is ~ ? can i've a simple example

请先登录，再回答此问题。

采纳的回答

Walter Roberson
Walter Roberson 2013-7-3
In that context, the ~ means to throw away the result that would normally go into that position. It is almost identical to saying
[TEMP17393, lowMap] = histeq(grayImage(binaryImageLow)); clear TEMP17393
except with no possibility of clashing variable names.

更多回答（1 个）

Image Analyst
Image Analyst 2013-7-3
grayImage(binaryImageLow) takes all the pixels that are "true" (white) in the binary image (mask) and strings them together into a 1D array - essentially a list of all the gray levels in the masked area.
histeq() then does histogram equalization on that 1D array. In my experience, histogram equalization is rarely helpful or even needed at all. It returns the lookup table that tells what input gray level should be mapped to what output gray level.

类别

在 Help Center 和 File Exchange 中查找有关 Histograms 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