Display Pixel Values in Image - Alternative to `showPixelValues()`

Question

Royi Avital 2017-9-3

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https://ww2.mathworks.cn/matlabcentral/answers/355059-display-pixel-values-in-image-alternative-to-showpixelvalues

评论： Image Analyst 2023-8-22

Hello,

I would like to display an image and its pixel values in a similar manner to showPixelValues().

What I need is to be able to display it on an Axes Object on my own.

Namely something like:

hFigure = figure();
hAxes = axes();
DisplayImagePixelsValues(hAxes, mInputImage);
% Now set the properties of the axis.

Are there any alternatives to `showPixelValues()`? Something with more user control.

Thank You.

---

Update

According to answers it seems I wasn't clear.

I don't want to show data of a current axis or something.

I want a function which the input is a matrix (Small one) and the output is a regular axis object with result of an image with text of the pixels values.

From there I'd like to be able to customize this axes to my wishes.

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Answer 1

Image Analyst 2017-9-3

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https://ww2.mathworks.cn/matlabcentral/answers/355059-display-pixel-values-in-image-alternative-to-showpixelvalues#answer_280162

How about impixelinfo()?

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Image Analyst 2017-9-3

What about im2html(): http://www.mathworks.com/matlabcentral/fileexchange/32273-im2html-m

If not, then you'll just have to use text() to put up text labels over the image pixels.

Royi Avital 2017-9-4

Hi, I looked into that. But I'd prefer having something which displays in a Figure Object (For exporting purposes). Has anyone implemented something like showPixelValues() in low level?

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Answer 2

Walter Roberson 2017-9-3

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https://ww2.mathworks.cn/matlabcentral/answers/355059-display-pixel-values-in-image-alternative-to-showpixelvalues#answer_280163

The existing File Exchange contribution you linked to, does an imshow() without any parent, so it will display inside the current axes.

However, I discovered recently that if you imshow() and the current axes is at the default position, that imshow sets up conditions so that the axes will typically be deleted on the next graphics operation. You can avoid that by setting a non-default Position for the axes.

In any case you can easily edit the File Exchange Contribution to add a 'Parent' property to the imshow() calls and other calls.

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Walter Roberson 2017-9-6

What HTML code? The routine you linked to does not create HTML. Which routine are you looking at that produces HTML?

Royi Avital 2017-9-7

See ImageAnalyst - im2html(): http://www.mathworks.com/matlabcentral/fileexchange/32273-im2html-m

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Answer 3

Sindhu 2023-8-22

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https://ww2.mathworks.cn/matlabcentral/answers/355059-display-pixel-values-in-image-alternative-to-showpixelvalues#answer_1291042

I need to display the pixel value in satellite image?

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Image Analyst 2023-8-22

Display how?

help impixelinfo
 IMPIXELINFO Pixel Information tool.
    IMPIXELINFO creates a pixel information tool in the current figure.  The
    pixel information tool displays information about the pixel in an image that
    the cursor is positioned over. The tool can display pixel information for
    all the images in a figure.
   
    The pixel information tool is a uipanel object, positioned in the lower-left
    corner of the figure, that contains the text string "Pixel Info" followed by
    the pixel information. The information displayed depends on the image type,
    as shown below. If the cursor is outside of the image area in the figure,
    the pixel information tool displays the default string.
   
    Image Type     Default String         Example
    ----------     --------------         -----------------
    Intensity      (X,Y) Intensity        (13,30) 82
    Indexed        (X,Y) <index> [R G B]  (2,6) <4> [0.29 0.05 0.32]
    Binary         (X,Y) BW               (12,1) 0
    Truecolor      (X,Y) [R G B]          (19,10) [15 255 10]
   
    If you want to display pixel information without the "Pixel Info" label, use
    IMPIXELINFOVAL.
   
    IMPIXELINFO(H) creates a pixel information tool in the figure specified by
    the handle H, where H is an image, axes, uipanel, or figure object. Axes,
    uipanel, or figure objects must contain at least one image object.
   
    IMPIXELINFO(HPARENT,HIMAGE) creates a pixel information tool in HPARENT that
    provides information about the pixels in HIMAGE.  HIMAGE is a handle to an
    image or an array of image handles.  HPARENT is a handle to the figure or
    uipanel object that contains the pixel information tool.
   
    HPANEL = IMPIXELINFO(...) returns a handle to the pixel information tool
    uipanel.
   
    Note
    ----
    To copy the pixel information string to the clipboard, right-click
    while the cursor is positioned over a pixel. In the context menu,
    choose Copy pixel info.
    
    For a floating point image with the 'CDataMapping' property set to
    'direct', the pixel information tool displays this default string: 
    (X,Y) value <index> [R G B]
   
    Examples
    --------
 
        h = imshow('hestain.png');
        hp = impixelinfo;
        set(hp,'Position',[5 1 300 20]);
   
        figure
        subplot(1,2,1), imshow('liftingbody.png');
        subplot(1,2,2), imshow('autumn.tif');
        impixelinfo
   
    See also IMPIXELINFOVAL, IMTOOL.

    Documentation for impixelinfo
       doc impixelinfo

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