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How can i observe a 3 dimensional matrix(hdr) using pcolor command?

Asked by Nithya on 8 Nov 2013
Latest activity Edited by Nithya on 19 Nov 2013

I have with me,

file={'img1.jpg','img2.jpg','img3.jpg','img4.jpg','img5.jpg'};
hdr = makehdr(file);  

hdr is 1728x2592x3 single matrix

I want to display this image file in pseudocolor.

my aim is to get the light intensity values. What shall i do?

Thank you

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Nithya

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1 Answer

Answer by Walter Roberson on 8 Nov 2013
Edited by Walter Roberson on 8 Nov 2013
Accepted answer
image(rgb2gray(hdr));
colormap(gray(256))

5 Comments

Nithya on 18 Nov 2013

Okay, i can find a calibration factor for the software luminance calculated.And i hope this calibration factor will compensate for all those assumptions and errors. Am i right.

I have another doubt, whether the R G and B pixel values of the hdr=makehdr(file) are linearly proportional to the radiance or light falling on the scene.

Walter Roberson on 18 Nov 2013

It would be more like a calibration curve, not a single factor.

Whether the values are linearly proportional to the radiance or the light falling on the scene is going to depend on what kind of detector you are using. It is not uncommon for detectors to go non-linear at the extreme ends, usually with increased sensitivity in low low light and decreased sensitivity in bright light.

Nithya on 19 Nov 2013

Camera response curve will also work in this regard right. Thankyou for your help

Walter Roberson

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