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David Legland


INRA, France

Last seen: Today Active since 2010

Research engineer in computer sciences, more precisely image processing and applied statistics. Interested in image analysis, geometrical modelling, image registration problems, estimation in discrete images, and polyhedral reconstruction. web page: http://www.pfl-cepia.inra.fr/ (in french) See also: http://github.com/mattools/matGeom http://github.com/mattools/matImage Professional Interests: image analysis, applied statistics, geometric computing, registration

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Answered
Masking data of 4D images
Hi Gina, I suppose that you want to repeat the binary mask along the missing dimension of your 4D data, right? One possibility...

3 years ago | 0

Answered
how to perform ANOVA on a matrix
Hi, If you want to test whether two column have same mean or not, you can check the ttest or ttest2 functions. [h12, p12...

7 years ago | 0

Answered
how to overlay multiple images into one single image
Hi, do you mean you want all images displayed at once? One way of doing is to use the montage function. This will create ...

7 years ago | 0

Answered
How can I iterate through a list of files using dlmread()?
Hi, The problem comes from you ask Matlab to open the file called 'file1', not the file whose name is stored in the variable ...

7 years ago | 1

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Answered
how to read 3-D medical image
Hi, there are plenty of contributions on the file exchange. In particular a contribution called "Read medical data 3D"... <...

9 years ago | 0

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Answered
How to find distance in binary image?
Hi maria, If you consider a label image (one label for each line), you can call "bwdist" function for each label "i". Then, for...

9 years ago | 0

Answered
How does this function "regionprops" to find the orientation of any object?
Hi Marian, the code is in the regionprops function, you can access it via "edit regionprops", and checking the "ComputeEllips...

9 years ago | 3

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Answered
superimpose points on image
Hi Milenko, One solution is to display the image (using etiher imshow, imagesc...), call "hold on", then plot the points at t...

9 years ago | 0

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Answered
How to rotate a plane in 3D around arbitrary point ?
Hi, Maybe you can decompose the procedure in two steps. First you apply the linear part of the transform to the normal vecto...

9 years ago | 0

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Answered
How do i calculate hessian matrix for an image?
Hi, you need to compute second derivatives in each direction, using something like: [gx, gy] = gradient(double(img)); [g...

9 years ago | 5

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Answered
How to extract the ROI using impoly?
Hi, You should use either imcrop, or impoly. Using imcrop, you can select a rectangular region of interset. By the way, th...

10 years ago | 0

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Answered
HOW TO FIND THE DIAMETER FOR THE IRREGULAR SHAPE OF AN IMAGE
Hi, in the image processing toolbox there is a function "regionprops" that gives you the equivalent diameter of a particle. Y...

10 years ago | 0

Answered
how to select a particular portion in am image automatically?
Hi, using imcrop you can also specify the coordinates of the box. Then you do not have to click. But you have to know the pos...

10 years ago | 0

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Answered
How to save triangulation mesh as a volume?
Hi, If your definition of volume is a 3D binary matrix/image, I would suggest using the polygon2Voxel tool from Dirk-Jan Kroo...

10 years ago | 2

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Answered
Plotting 3d Sphere with specific radius
Hi, maybe by specifying the radius as a scaling factor: surf(x*r+a, y*r+b, z*r+c); axis equal;

10 years ago | 4

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Answered
removing some connected component
Hi Selim, if your input is a label image, you can use the following syntax: img(img == ind) = 0; This will detect wh...

10 years ago | 1

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Answered
i couldn't understand convex area
Hi Selim, the 'convexArea' property corresponds the area of the convex hull of the region. The convex hull of a region is the...

10 years ago | 2

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Answered
Plotting an Ellipse
Hi, Maybe the best way to draw an ellipse is to use its parametric form: % compute points corresponding to axis-oriented...

10 years ago | 0