Imhist not working matlab


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imhist not working matlab

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MathWorks Answers Support. Open Mobile Search. Trial software. You are now following this question You will see updates in your activity feed. You may receive emails, depending on your notification preferences. Trouble using imhist in image. Margarida Moura on 24 Nov Vote 0. Commented: Image Analyst on 24 Nov Accepted Answer: Image Analyst. I want to see the histogram of my image, but I don't know why, it doesn't show.

Here's my code:. The error is :" Error using imhist.

Lesson 26 Histogram Matching in Image Processing using Matlab

Expected input number 1, I or X, to be two-dimensional. Error in imhist line Error in Process line 3. My image is xx3 uint8. Thank you very much. Accepted Answer. Image Analyst on 24 Nov Cancel Copy to Clipboard. Edited: Image Analyst on 24 Nov You're passing in a color image and imhist is not set up for that. If you want 3 histograms, extract each color channel independently.Sign in to comment.

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Problem with Imhist method

Unable to complete the action because of changes made to the page. Reload the page to see its updated state. Choose a web site to get translated content where available and see local events and offers. Based on your location, we recommend that you select:. Select the China site in Chinese or English for best site performance. Other MathWorks country sites are not optimized for visits from your location. Toggle Main Navigation.

Search Answers Clear Filters. Answers Support MathWorks. Search Support Clear Filters. Support Answers MathWorks. Search MathWorks. MathWorks Answers Support. Open Mobile Search. Trial software. You are now following this question You will see updates in your activity feed. You may receive emails, depending on your notification preferences. Shel on 9 Aug Vote 0. Commented: Shel on 15 Aug I tried to write the code as following however it does not work. I will highly appreciate any suggestions on how to remove the error s and plot the histogram of the image in this regard.

Cancel Copy to Clipboard. If you do not want to use imhist for whatever reasonwhy dont you use one of the others like histogram?

imhist not working matlab

Image Analyst on 9 Aug Why do you think imhist is inaccurate? Can you attach your dcm file? And a screenshot of what it looks like, and what you expected it to look like? Very short Tutorial to format your code. Thorsten on 9 Aug It is more likely that your data or your interpretation of the histogram is corrupted or wrong rather than the imhist function. Shel on 10 Aug Thanks for your response: here is the filtering both by matlab and imagej. As it can be seen in imagej the domain becomes shorter and the peak value increase but in matlab it seems that the domain in the X axis has become wider.

Also, there is a lot of difference between the images and histograms that is plotted by the two software. I have attached the original pic in the ZIp file because dicom files are not supported here.Sign in to comment.

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You may receive emails, depending on your notification preferences. Why imhist do not run? Vote 0. Answered: Image Analyst on 22 Mar This is the code:. Display error, why? Benjamin Kraus on 22 Mar Cancel Copy to Clipboard.

What error? Answers 4. Image Analyst on 22 Mar Vote 1. First read this link. And post the results of this what do you see :. Abhishek Ballaney on 22 Mar Could the problem be that you do not have a license for the Image Processing Toolbox? No, it's a default image of Matlab. See Also. Tags imhist. Start Hunting! An Error Occurred Unable to complete the action because of changes made to the page.

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You may receive emails, depending on your notification preferences. How to use imhist to generate a plot from loop of images? Emma on 16 Nov Vote 0. Edited: Emma on 19 Nov Accepted Answer: Jan. I'd tried to loop the images to display one histogram of a 3-D Intensity Image, but it seems not working properly.

The path was set correctly, that I am able to cd back to the folder. Im wondering the problem might come from any basic mistakes that I made. Any suggestion would be appreciated!

Jan on 16 Nov Cancel Copy to Clipboard.

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By the way: The problem has not relation to imhistbut it occurs during creating the file name already. I will report the error since now then. Accepted Answer. Edited: Jan on 16 Nov Omit the cd but work with abosulte path names, because this is much safer and avoid common pitfalls. It is not a problem concerning the path.

This would be clear, if you post the error message, instead of explaining, what you think it means.Join Stack Overflow to learn, share knowledge, and build your career. Stack Overflow for Teams is a private, secure spot for you and your coworkers to find and share information.

I have an image named boat stored in a. I can only view the image with imshow boat,[0 ].

imhist not working matlab

When I use imhist boat I again get a blank box. How do I see the histogram. I need to see the histogram. Also I am not able to use histeq boat for histogram equalization. Here is the link to the Boat. By default, imshow assumes a floating-point image with values between 0 and 1, which is why your image with values from 0 to appears entirely as white - all the values are greater than 1. As you found, you can force imshow to scale the values differently but it is probably easier if you just rescale the image first, and keep it like that:.

EDIT: As Shai has pointed out below, this happens is because imshow and others predict the range of values based the datatype of the matrix - since your boat matrix is a doublethey assume the range 0 to 1. Therefore an alternative fix is to convert the matrix to an integer type, which will make imshow assume a range of 0 to Regarding the imhist image part, you might want to try converting the image to grayscale first even if it was originally a grayscale imageas follows:.

After, you should be able to perform the imhist newImage without any problems. Let me know if it works! Learn more. Imhist in matlab does not display the histogram Ask Question. Asked 7 years, 9 months ago.

Active 2 years, 10 months ago. Viewed 3k times. Any help will be appreciated.Documentation Help Center. The imhist function returns the histogram counts in counts and the bin locations in binLocations.

The number of bins in the histogram is determined by the image type. The histogram has one bin for each entry in the color map. If the input image is an indexed image, then the histogram shows the distribution of pixel values above a color bar of the color map map.

Display a histogram of the image. Since I is grayscale, by default the histogram will have bins. Display the histogram of the data. Since the image is grayscale, imhist uses bins by default.

plotting the histogram of images (difference in MATLAB and ImageJ)

Grayscale image, specified as a numeric array of any dimension. If the image has data type single or doublethen values must be in the range [0, 1].

If I has values outside the range [0, 1], then you can use the rescale function to rescale values to the expected range. Data Types: single double int8 int16 int32 uint8 uint16 uint32 logical. Number of bins, specified as a positive integer.

If I is a grayscale image, then imhist uses a default value of bins. If I is a binary image, then imhist uses two bins. Data Types: single double int8 int16 int32 int64 uint8 uint16 uint32 uint Data Types: single double uint8 uint16 logical. Color map associated with indexed image Xspecified as a c -by-3 numeric matrix with values in the range [0, 1].

Each row is a three-element RGB triplet that specifies the red, green, and blue components of a single color of the color map. The color map must be at least as long as the largest index in X.

Histogram counts, returned as a numeric array. If the histogram is computed for an indexed image, Xthen the length of counts is the same as the length of the color map, map. In particular, the p th bin is the half-open interval.

The scale factor A and offset B depend on the type of the image class as follows:. To display the histogram from counts and binLocationsuse the command stem binLocations,counts. Note that if you choose the generic MATLAB Host Computer target platform, imhist generates code that uses a precompiled, platform-specific shared library. Use of a shared library preserves performance optimizations but limits the target platforms for which code can be generated.

If the first input is a binary image, then n must be a scalar constant of value 2 at compile time. Nonprogrammatic syntaxes are not supported. For example, the syntax imhist Iwhere imhist displays the histogram, is not supported. When you omit output arguments on a GPU, imhist does not display the histogram. In this case, the function returns the histogram counts in the variable ans and does not return the histogram bin locations.

A modified version of this example exists on your system. Do you want to open this version instead? Choose a web site to get translated content where available and see local events and offers.

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Problem with imhist after modify image

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You may receive emails, depending on your notification preferences. Problem with imhist after modify image. Dani D on 11 Mar Vote 0. Commented: Zahra Saman on 12 Apr Hello, Why After histogram in 0 to 1 range? Zahra Saman on 12 Apr Cancel Copy to Clipboard. Plz help me to remove this error pleasw. Answers 2. Ahmet Cecen on 11 Mar Vote 1.

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For now use:. That will get your work done, although it puzzles me why that is necessary, because imhist normally accepts double. I use uint8 I for imshow,not imhist.


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