清空筛选条件
清空筛选条件

How to convert the raw hyperspectral image (hawaii or yellowstone)into .mat file?

3 次查看（过去 30 天）
Shrish Bajpai
Shrish Bajpai 2019-5-9
评论： Walter Roberson 2019-5-10
I have raw images which I has taken from the link
https://aviris.jpl.nasa.gov/data/free_data.html
https://coding.jpl.nasa.gov/hyperspectral/
I need to convert this raw files to .mat file through the matlab, so that I can get the image band by band

请先登录，再回答此问题。

采纳的回答

Walter Roberson
Walter Roberson 2019-5-9
X = multibandread('hawaii_sc01.raw', [512, 614, 224], '*uint16', 0, 'bip', 'ieee-be');
The datatype is uint16 but the data is 12 bit, so the used portion is theoretically 0 to 4095 but in practice the range is 82 to 1006, so call it [0 1023]
According to the README, that particular file is the above size, and the maine file below it is a different size also 12 bit, and all of the rest of the files are 512 lines x 680 samples x 224 bands, instrument bit depth = 16 bits which would correspond to
X = multibandread(filename, [512, 680, 224], '*uint16', 0, 'bip', 'ieee-be');
You would have to examine the values to see what the actual data range is.
  4 个评论
显示 2更早的评论
Shrish Bajpai
Shrish Bajpai 2019-5-10
Respected Sir,
As per ypur suggestion, I used the following commands to draw the i image of the band 100, but I am not getting what I need to get get. It is image that contains only alt and pepper noise.
X = multibandread('aviris_sc0.raw', [224 680 512],'int16',0, 'bip', 'ieee-be');
X100=squeeze(X(100,:,:));
I request you kindly guide me if I am wrong.
Walter Roberson
Walter Roberson 2019-5-10
filename = 'aviris_sc0.raw';
X = multibandread(filename, [512, 680, 224], '*uint16', 0, 'bip', 'ieee-be');
X100 = fliplr(X(:,:,100));
imshow(X100,[])
Now compare to the first false-color image at https://coding.jpl.nasa.gov/hyperspectral/falsecolor.html and it will be obvious that the data has been extracted in the right order.

请先登录，再进行评论。

更多回答（1 个）

Shrish Bajpai
Shrish Bajpai 2019-5-10
Respected Sir,
It is working!!!
Thanks for guiding me and solving my problem which I was stuck for last six month (still hawaii is there which I am not able to convert).
Again I thanks to you by my folding hands (Indian Hindu culture) for guiding me on the issue.
Regards,
Shrish Bajpai
Detail Code as follows
Dim = [512,680,224]; % lines, samples, bands
dType = 'int16'; % for data type 2
hOffset = 0;
intlve = 'bip';
border = 'ieee-be'; % For byte order 1
X = multibandread('aviris_sc3.raw',Dim,dType,hOffset,intlve,border);
figure; imshow(X(:,:,1),[])
  1 个评论
Walter Roberson
Walter Roberson 2019-5-10
Earlier I posted
X = multibandread('hawaii_sc01.raw', [512, 614, 224], '*uint16', 0, 'bip', 'ieee-be');
Before I posted that I tested it and compared it to the sample images that they provided, so I was sure that the data was read properly.

请先登录，再进行评论。

类别

在 Help Center 和 File Exchange 中查找有关 Hyperspectral Image Processing 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