Extracting wavelength vector from an .hdr file

Question

Findus 2019-6-11

1
链接

此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/466502-extracting-wavelength-vector-from-an-hdr-file

回答： Subhadeep Koley 2020-11-16

Hi all,

I am fairly new to MATLAB.

I'd like to extract a number of wavelengths as a vector from an .hdr file (see below). They are one value per line, preceded by four spaces, followed by a comma, and start at line 21 and stop at line 224 of the file.

How can I read them into matlab?

Thank you in advance!

.hdr file contents:

ENVI
description = {Data recorded with Specim IQ}
samples = 512
lines = 512
bands = 204
header offset = 0
file type = ENVI
data type = 12
interleave = BIL
sensor type = SPECIM IQ
byte order = 0
default bands = {70,53,19}
latitude = 0.00000000
longitude = 0.00000000
acquisition date = 23-05-2019
errors = none
binning = {1,1}
tint = 3
fps = 150
wavelength = {
32,
20,
09,
97,
85,
74,
63,
52,
40,
29,
19,
08,
97,
87,
76,
66,
56,
45,
35,
25,
16,
06,
96,
87,
77,
68,
59,
50,
41,
32,
23,
14,
06,
97,
89,
80,
72,
64,
56,
48,
40,
33,
25,
18,
10,
03,
96,
89,
82,
75,
68,
62,
55,
49,
43,
36,
30,
24,
18,
12,
07,
01,
96,
90,
85,
80,
75,
70,
65,
60,
55,
51,
46,
42,
38,
34,
30,
26,
22,
18,
15,
11,
08,
04,
01,
98,
95,
92,
89,
87,
84,
81,
79,
77,
75,
73,
71,
69,
67,
65,
64,
62,
61,
60,
58,
57,
57,
56,
55,
54,
54,
53,
53,
53,
53,
53,
53,
53,
53,
54,
54,
55,
56,
56,
57,
58,
60,
61,
62,
64,
65,
67,
68,
70,
72,
74,
77,
79,
81,
84,
86,
89,
92,
95,
98,
01,
04,
07,
11,
14,
18,
22,
25,
29,
33,
37,
42,
46,
50,
55,
60,
64,
69,
74,
79,
84,
90,
95,
01,
06,
12,
18,
24,
30,
36,
42,
48,
55,
61,
68,
74,
81,
88,
95,
02,
10,
17,
24,
32,
40,
47,
55,
63,
71,
79,
88,
96,
05,
13,
22,
31,
40,
49,
58
}

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Answer 1

Subhadeep Koley 2020-11-16

1
链接

此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/466502-extracting-wavelength-vector-from-an-hdr-file#answer_546378

在 MATLAB Online 中打开

You can use the enviinfo function to achieve the same.

% Load the HDR information
info = enviinfo('yourFile.hdr');
% Extract out the wavelength values
wavelengthValues = info.Wavelength;

The above mentioned feture comes under Image Processing Toolbox's Hyperspectral Imaging Library support package, and can be downloaded from here. For more information on Hyperspectral Imaging Library see the documentation.