# Mehri Mehrnia

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Question

reduce resolution of an MRI image

to reduce the resolution of grayscale MRI image, I cut the sorrounding area of k-space(FFT of the image). the rsult I get is rea...

12 months ago | 2 answers | 0

### 2

answerswhat is wrong with ifft process on this image?

what is that division by m??

12 months ago | 0

Question

dilate a shell while keeping openings

I have a shell which is not concrete. while dilating, the opennings are going to be closed. how can I solve this problem. I've i...

1 year ago | 1 answer | 0

### 1

answer### 1

answerpearson and Spearman correlation and the corresponding 95% and 99% confidence level in Matlab

Is "corrcoef" for Spearman correlation?

1 year ago | 0

How to add Rician noise to an image?

what you have done looks wrong for me. if you ignore imaginary part of image then noisy image is same as original one.

1 year ago | 0

Save all the plots

Based on the answers, it means there is no 1 line of code which can save all open plots?

2 years ago | 0

Question

spline for corner object

I have a contour that I have extracted important points of it based on detectHarrisFeatures. Now I need to connect these points ...

2 years ago | 2 answers | 0

### 2

answersQuestion

extract control points of curve with spline

I almost studied whole matlab help and mathwork posts about spline. But, nobody wants to extract control points out of a give...

2 years ago | 2 answers | 0

### 2

answersQuestion

norm vector of pixels on edge of an image

I need to show norm vectors of of each pixels on edge of image. an example is attached

2 years ago | 1 answer | 0

### 1

answerhow to find the gradient of pixels in angular direction?

If I want to find the norm of edge, should I replace 30 with 90 in the above formula? Is "H*cosd(30)+V*sind(30)" a vector or p...

2 years ago | 0

Question

change histogram to PDF

I have attached a histogram which is attached. This histogram is computed step by step based on milions of samples. If I don't...

2 years ago | 1 answer | 0

### 1

answerHow can we calculate probability density of a histogram?

I have the same problem , just at I want to have same edges in both before normalization and after normalization. I got an str...

2 years ago | 0

Question

pair-was operation on 3D image(3D matrix)

I have 3D image, in fact it's slices of heart which is a 3D matrix(i.e N=640*640*64). I want to do an operation such as asb(diff...

2 years ago | 2 answers | 0

### 2

answersEnlarging an image with spline interpolation

Hi, I really appreciate this Q/A, helped me. I have a countour which is a complex shape(left atrial of heart). I want to sele...

2 years ago | 0

Question

difference of SSIM and multissim?

I work on MRI images and now I assess different k-space trajectories on mri images. I used ssim and nrmse to assess the qualit...

2 years ago | 1 answer | 0

### 1

answerWhat's the difference between imagesc and imshow?

I work with cardiac MRI images(grayscale). it happens repeatedly that "imagesc" shows the image while "imshow" shows a nonsence ...

2 years ago | 1

Find differences in a set of points without a for loop

I have the question to find all pair-wise difference in a group without loop! My array in scale of milions!

2 years ago | 0

Spline smoothing in images

I have the same question. In all spline questins, we map coordinates of points and then interpolate. But, for imaging, how I c...

2 years ago | 0

how to fill boxes in Boxplot with different colors

I want facecolor with command "boxplot" not "boxchart". Can anyone help? The reason that I use boxplot, it's more handy for "le...

3 years ago | 2