# 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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Respondida
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.

más de 9 años hace | 0

Respondida
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...

más de 9 años hace | 0

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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...

casi 10 años hace | 0

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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...

alrededor de 10 años hace | 0

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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...

alrededor de 10 años hace | 0

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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 ...

alrededor de 10 años hace | 0

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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 ...

alrededor de 10 años hace | 0

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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...

alrededor de 10 años hace | 0

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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 ...

alrededor de 10 años hace | 0

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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...

más de 10 años hace | 0

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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 ...

más de 10 años hace | 0

Respondida
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...

más de 10 años hace | 0

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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...

más de 10 años hace | 0

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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...

más de 10 años hace | 1

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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...

más de 10 años hace | 0

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

casi 11 años hace | 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(...

casi 11 años hace | 1

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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...

casi 11 años hace | 0

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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...

casi 11 años hace | 1

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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 ...

alrededor de 11 años hace | 0

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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.

alrededor de 11 años hace | 0

Respondida
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...

más de 11 años hace | 0

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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...

más de 11 años hace | 0

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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 ...

más de 11 años hace | 0

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how to cut out circle from an eye image
Can you show some code that you tried.

más de 11 años hace | 0

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Detecting circles in an image.
IMFINDCIRCLES allows you to specify a radius range which can include the entire range of expected radii.

más de 11 años hace | 0

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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...

más de 11 años hace | 2

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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...

más de 11 años hace | 0

Respondida
Optimize the edge detection
imopen might be more selective in removing segments based on their size.

más de 12 años hace | 1