# Spandan Tiwari

### MathWorks

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Professional Interests: Image Processing, Computer Vision, Machine Learning,Signal Processing, Pattern Recognition, Partial Differential Equations

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**Feeds**

Is medfilt2 a zero-phase filter?

medfilt2 is a median filter, which is a non-linear filter. So, no, it cannot be considered a zero-phase filter.

mer än 9 år ago | 0

| accepted

What is moments of image?

Your question is very broad to be answered fully here. There are many tutorials on Zernike moments that you can find online with...

mer än 9 år ago | 0

How to use filter

The classical homomorphic filtering might be able to help here. See the following blog post on the blog Steve on Image Processin...

ungefär 10 år ago | 0

sharpening image and removing noise

Also for the image sharpening part, you can use the function IMSHARPEN in the Image Processing Toolbox. It has parameters that y...

ungefär 10 år ago | 0

blood vessel segmentation help

This may not be directly relevant but since you mentioned FCLAHE I wanted to point out that the ADAPTHISTEQ function in the Imag...

ungefär 10 år ago | 0

| accepted

Calculating the number of pixels inside a freehand region.

Since you are already using imfreehand, you can use the method named createMask available in the imfreehand object to rasterize ...

ungefär 10 år ago | 0

| accepted

Radius precision of circles when using "imfindcircles" to find circles?

The 'Phasecode' method inherently supports radius estimation with sub-pixel accuracy, and hence the results have floating-point ...

mer än 10 år ago | 0

| accepted

Use of Bresenham line algorithm to generate 1D profiles from a DTM

If you can morph the data into a 2D matrix, say as a 2D image, you can use the function *improfile* from the Image processing To...

mer än 10 år ago | 0

| accepted

detecting rectangle in real images

If your rectangle does not change orientation, you can try using normxcorr2 (in Image Processing Toolbox) with the rectangle as ...

mer än 10 år ago | 0

finding of mse and psnr

There's a function named psnr() in Image Processing Toolbox in R2014a for computing PSNR. MSE is also computed on the way to com...

mer än 10 år ago | 0

Exactly Which otsu extension is working at back end of multithresh.m in matlab2013a.

The algorithms are from the paper: Otsu, N., "A Threshold Selection Method from Gray-Level Histograms," IEEE Transactions on ...

mer än 10 år ago | 0

| accepted

need matlab code for image texture analysis

You can look at the functions graycomatrix and graycoprops for computing the popular Gray-Level Cooccurrence Matrix (GLCM) text...

mer än 10 år ago | 0

| accepted

Help with cropping a binary image?

Use IMCOMPLEMENT to invert the polarity of the binary images so that the object (fist) is white. Then use BWBOUNDARIES to get th...

mer än 10 år ago | 0

How to remove small CLUTTER from images?

BWAREAOPEN assumes that the objects are white. In your case the objects (regions that you want to remove) are black. So first co...

mer än 10 år ago | 1

how to find Windowed Fourier Transform of an image? If possible function script is needed.

STFT computation requires computing Fourier Transform of sub-blocks of the image. You can use fft2() to get Fourier Transform. F...

mer än 10 år ago | 0

| accepted

To fill a closed curve

If you can make a binary image for the closed curve, you can use imfill in Image Processing Toolbox.

nästan 11 år ago | 0

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dashed line imrect of imline

Something like this would help you make a dashed line using *imline* . h = imline(); h1 = get(h,'Children'); set(h1(...

nästan 11 år ago | 1

| accepted

how to divide into blocks of 8x8 pixels?

The function *blockproc* in the Image Processing Toolbox maybe a natural fit if you would like to do process the image in blocks...

nästan 11 år ago | 0

colour image segmentation using k means

Another alternative could be to use multi-level Otsu's thresholding to get the segmentation. You can use the function *multithre...

nästan 11 år ago | 1

how to compare the color image to another color image in directory?

One way to compare the images quickly would be compute a structural quality metric such as SSIM between the two images. It is a ...

ungefär 11 år ago | 0

directional filter for detecting edges on a circle and rectangle

Look at the function IMFINDCIRCLES in Image Processing Toolbox (R2012a onwards) for detecting circles in your image.

ungefär 11 år ago | 0

segmentation

No the initial mask can be any shape although it is preferable to start with a relatively smooth shape such as a circle. You...

mer än 11 år ago | 0

Best Segmentation technique for a structurally homogenous image

Try using the new function activecontour in the Image Processing Toolbox that shipped in R2013a. It should be useful for this pr...

mer än 11 år ago | 0

Looking for an implementation of the active contours without edges method which can be/is initialized with multiple contours?

There's a new function in Image Processing Toolbox in R2013a named activecontour which can do Chan-Vese segmentation and can be ...

mer än 11 år ago | 0

| accepted

how to cut out circle from an eye image

Can you show some code that you tried.

mer än 11 år ago | 0

Detecting circles in an image.

IMFINDCIRCLES allows you to specify a radius range which can include the entire range of expected radii.

mer än 11 år ago | 0

how to speed up imfindcircles

Two ways to get IMFINDCIRCLES run faster in your code are: 1) Sending in the image at a lower resolution. 2) Use smaller r...

mer än 11 år ago | 2

How can I use imfindcircles in real time video?

Two ways to get IMFINDCIRCLES run faster in your code are: 1) Sending in the image at a lower resolution. 2) Use smaller r...

mer än 11 år ago | 0

Optimize the edge detection

imopen might be more selective in removing segments based on their size.

mer än 12 år ago | 1

| accepted

change color "bwperim"

You can change the color by filling the perimeter pixels with a color value instead of a scalar 255. One possible way to do this...

mer än 12 år ago | 1