- LL is the approximate image of input image it is low frequency subband so it is used for further decomposition process.
- LH subband extract the horizontal features of original image.
- HL subband gives vertical features .
- HH subband gives diagonal features .
What are LL,LH,HL,HH in DWT?
99 ビュー (過去 30 日間)
古いコメントを表示
Hello everyone, I have a small project where my first step is to decompose an image using DWT. Could anyone help me explain
1:what are LL,LH,HL,HH in DWT?
2: what code do i need to write if I want to do a second level and even third level decompostion to extract the value of LL
0 件のコメント
回答 (1 件)
Saurav Chaudhary
2020 年 11 月 5 日
DWT is an algorithm used to reduce dimensionality of an image, feature extraction process. DWT algorithm decomposes the image into 4 sub-band (sub-image) ie,LL,LH,HL,HH.
You can decompose LL band image further, look at the following MATLAB answer to get an idea.https://www.mathworks.com/matlabcentral/answers/163844-how-to-write-matlab-code-for-third-level-dwt
2 件のコメント
Dominic Mathew
2021 年 3 月 17 日
I had tried to do hyperchaotic image encryption for the decomposed LL image but it is showing error could you explain why and how to resolve it.
参考
カテゴリ
Help Center および File Exchange で Discrete Multiresolution Analysis についてさらに検索
Community Treasure Hunt
Find the treasures in MATLAB Central and discover how the community can help you!
Start Hunting!