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Blue Channel Not Separating from Image
Your image is a gray scale image; it is NOT a RGB true color image. There is no blue channel. You can make your code more robu...

presque 3 ans il y a | 0

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Energy (uniformity) of an image
Depends on what you mean by energy. Pixel values are, for a reflective image like taken with a regular video camera, already in...

presque 3 ans il y a | 0

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How to zoom in to a particular point of an image?
Try changing the axis limit by calling xlim and ylim to be the ranges you want. help xlim

presque 3 ans il y a | 1

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dilate a shell while keeping openings
Not sure what the "problem" is. You didn't say. Yes, dilation will make gaps closer, of course. Do you not want the gaps to g...

presque 3 ans il y a | 0

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Is there something similar to polyval for circle fitting?
What's wrong with downloaded functions? I'm attaching one I use, along with a paper for more general purpose one.

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find what is the bounding box that encircles the whole objects as one unit?
No looping and using min() and max() needed. Just use bwconvhull and regionprops. Something like (untested): % Read the image...

presque 3 ans il y a | 0

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How do I determine the thickness of the ice at the leading edge of the airfoil from the image?
Subtract the first image from the icy image using imabsdiff. Then call bwareaopen to throw out blobs too small to consider. Th...

presque 3 ans il y a | 0

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collect all same coins in each figure
This is just what my tutorial does. See my Image Segmentation Tutorial in my File Exchange: Image Analyst's File Exchange It'...

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How I can normalize a range of columns of an image
It doesn't matter that the values in those columns vary. But if img is of type uint8, you need to cast it to double otherwise w...

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(kmeans clustering) Why doesn't image resulting from labeloverlay have the same size as original image?
Don't do [0,5]. That argument does not apply to RGB images (like what labeloverlay returns), it only applies to gray scale imag...

presque 3 ans il y a | 0

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How to change the pixel value int16 to new value?
Not sure I understand this: "I want to convert all the pixel value with new value IMG_cps" but why can't you just say IMG(:,:) ...

presque 3 ans il y a | 0

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How to find a concentric irregular polygon
I'd just find the centroid of the shape, then run around the perimeter finding the distance to the centroid. Then use normal tr...

presque 3 ans il y a | 0

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How to calculate the pixel value segmentation
I believe the total pixel count would be numel(P~=0).

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how to separate and show original color of foreground and background image in matlab?
You need to "segment" your image. How you do that depends on what your foreground and background look like. I'm attaching a de...

presque 3 ans il y a | 0

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how to show color of image in a pixel coordinate?
After you display the image, do this: impixelinfo

presque 3 ans il y a | 0

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How to rotate some part of image?
You can use the radon transform to determine the angle you need to rotate by. See how I rotated the football in the attached de...

presque 3 ans il y a | 0

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Why does it take MATLAB so long to print hello world?
What MATLAB commands did you issue from the command line? What you gave does not work: >> $ time matlab -nojvm -noFigureWindow...

presque 3 ans il y a | 2

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how velocize operation boolean
You asked : "(i want to find idx element that change from 0 to 1 )" So do this: a = [5, 0, 1, 9, 0, 1]; index = strfind(a, [...

presque 3 ans il y a | 0

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how velocize operation boolean
That code has nothing to do with your subject line. You want logicalIndexes = a == 1 % or linearIndexes = find(a == 1) Same...

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How to get the coordinates of the peak from normxcorr2 between a ROI and a template
See attached demo.

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Estimating the diameter and frontal area of evaporating droplets
Try this: % Demo by Image Analyst clc; % Clear the command window. close all; % Close all figures (except those of imtool...

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Image combination of a selected feature / image processing
You want to invert your mask (second image) and use it as logical indexes to your original image (grayImage). grayImage(~mask) ...

presque 3 ans il y a | 0

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Operation with logical data. Which is better?
Those are different things you're showing. "a.*(a<5)" is a double vector. Your A only shows positive values, while B shows non-...

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There is anyway that I can plot a graph like this in MatLab with standard deviation ?
Do you mean like the "errorbar" LinePlot shown about half way down the page here: https://www.mathworks.com/products/matlab/plo...

presque 3 ans il y a | 0

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How to detect marker with specific feature on it?
Try this. Note that I only found 2 markers because one of them is not surrounded by a solid black circle -- it has a gap, like ...

presque 3 ans il y a | 1

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How to find number of intensity levels in an image
Just mentioning imhist in case you wanted the number of pixels at each gray level (distribution) instead the number of unique gr...

presque 3 ans il y a | 2

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find the coordinates 5 first white pixels in an image
Try this: % Find coordinates of the last and first white pixel % First image pix_amarelor = imread('pac14_e.png'); [row1firs...

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Insert an external image in a video
You can paste your image on top of your frame before you send it to videoWriter. See my attached copy and paste demo. I've als...

presque 3 ans il y a | 0

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I am trying to find the radius of an arc in an image.
Try this. I'm using find() to get the x and y of the mask rather than a double for loop like @William Rose. The computed radiu...

presque 3 ans il y a | 2

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Does MATLAB Mobile count as a license install?
I don't believe so. I have installed it on my phone and it does not show up at all in my list of licenses. You can try it. Ju...

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