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Alejandro Sánchez


Active since 2015

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After i use dcraw convrting the pic in tiff, then apply J = demosaic(I,'bggr'); in matlab. how many correction do i need to do to convert this picture in srgb using matlab???? thanks before hand
i used dcraw -d -W -g 1 1 -o 0 -t 0 -T image.cr2

8 years ago | 0 answers | 0

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every camera has different filters and sensors, so you can get different rgb values using different cameras taking pics in the same conditions and the same scene. How accurate is srgb2lab when you convert multi cameras pictures???
when you take pictures from different cameras, and that pics you convert them using srgb2lab, is this exact, provided that every...

8 years ago | 0 answers | 0

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when i am going to convert from srgb2XYZ with a camera using non-standard illuminants, i calculate these illuminants through a spectroradiometer, Do i have to calcaulate anything else??
seeing the code od this transformation i noted you always use this matrix M = [0.4124 0.3576 0.1805; 0.2126 0.7152 0.0722; 0.01...

8 years ago | 0 answers | 0

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how can i characterize a camera which use non-standard illuminants,cause this is an step to convert srgb2lab. i use a ring with UV, white, blue leds to irradiate an area???
when i´m goig to transform from rgb into CIELab (srgb2lab) the illuminant is part of the calculations. Matlab has illuminants li...

8 years ago | 1 answer | 0

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let me explain myself better .how can i characterize a camera which use non-standard illuminants,cause this is an step to convert srgb2lab. i use a ring with UV, white, blue leds to irradiate an area???
let me explain myself better, what im going to do is to take using a camera, skin lesions pictures using different source of lig...

8 years ago | 0 answers | 0

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hi,im trying toget the images of L,a,b of CIELab but when i make thetransformation from srgbtolab iget the images ingrayscale,L must be gray-scale color but A shouldbe redness to greenness and b yellowness to blueness. what code i canuse to get this?
If i imread a picture ex, %load rgb image src = 'patio.jpg'; rgbI = imread(src); %convert to lab labTransform...

8 years ago | 1 answer | 0

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im trying to get L,A,B images using CT=makecform('srgb2lab'); lab=applycform(I,CT);(labL(:,:,1));(labL(:,:,2));(labL(:,:,3)); but A,B are graysscale images. shouldnt be A red2green and B blue2yellow images?? dont get it????? thanks beforehand
im trying to get L,A,B images using CT=makecform('srgb2lab'); lab=applycform(I,CT);(labL(:,:,1));(labL(:,:,2));(labL...

8 years ago | 1 answer | 0

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why matlab represents the images of A,B of CIElab in greyscale??? how can represent A image frongreen to red colors and B fron yellow to blue colors as correspond, and the lab image does not correspond to the sama image in RGB??? thanksss
why matlab represents the images of A,B of CIElab in greyscale??? how can represent A image from green to red colors and B from ...

8 years ago | 1 answer | 0

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