# Tagged Questions

Questions on the image processing capabilities implemented in Mathematica.

48 views

### Context-aware Locator

I'm trying to use a Locator for some image processing tasks. Unfortunately, the images we're using have a high dynamic range of low-frequency black and white ...
138 views

### How to apply GradientFilter locally to an image?

I have an MR image of a knee. I want to apply a gradient filter locally so that if I click on a pixel, for example, say on any part of the femur, I'll be able to choose a circular or rectangular ...
90 views

### What kind of preprocessing does Mathematica do when I use EdgeDetect on an image?

I am doing my own implementation of Canny and Sobel in another language (not in Mathematica). I was testing the EdgeDetect method (Sobel and Canny), and my own, and ...
49 views

### Image assembly without sharp edges

I applied FourierDCT on an image by dividing it into 8*8 blocks. When I combine the blocks to together i obtain the image how can I smoothen the edges of each block? My entire code is ...
65 views

### Getting raw data using DcRaw

I'm using dcraw program to import raw image data to Mathematica. When I use Run["dcraw -4 -D -T "image.nef"] (which converts it to an unprocessed linear TIFF file) ...
281 views

### How to count precisely proportion of some small pane in a electron microscope picture by it “Area”

The question is link this post.But It more hard than that I think.That time I count it by contrast,computer is good at it.But this time I wanna count the little pane...
45 views

### How to use a picture to store some data [duplicate]

As we know.The values of the types is "Real" defaultly in Mathematica.In the Image documentation's detail we can see Image[...
60 views

### Is there any way to speed up this image manipulator?

This post is only a part of a broader analysis that I am performing on the image processing speed, but I think it's interesting in itself. I will post more in the next days. Now the problem is: I have ...
265 views

### Interstellar Image Effects

I'd like to know how to create this type of gravitational lensing effect in an image (here are some star fields from the hubble) "I wrote down the equations and I tested them in Mathematica by ...
39 views

### Image Classification Using Local Maxima and Gradients

I can get all the local maxima using MaxDetect. For example, I have taken the image of Lena and found the local maxima using ...
600 views

### How to use 2D Fourier analysis to clean the noise in an image

I have some other method to do this.But I desire to know how to use Fourier analysis to realize it. I found a base post about Fourier-analysis to use in Image-Processing--Calculate the 2D Fourier ...
49 views

### Overlay Inside a Grid/Column/Row Not Working

Here is a microscopy image of some cells I want to make measurements on with Mathematica: In order to make some measurements of cells in a microscopy image I have written a simple dynamic overlay ...
118 views

### Create a 3D face from the Shroud of Turin

There is an image of the Shroud of Turin: How to recreate Jesus's face from this image? And how to create a 3D face of Jesus Christ, by using the shroud of Turin? I tried: ImageAdjust @ ...
47 views

### How to use Rescale to make a brighter image?

I want to compose three single exposures into an RGB image. I have three 2D arrays that represent each exposure and I can combine them into a 3D array, specifying the RGB values for each pixel. My ...
222 views

### How to restore an old photo?

I have an old image with scratches that I would like restored. Here is what I have so far: ...
105 views

### Why does ImageFilter fail with radius 1, but works with radius 2?

Bug introduced in 9 and persists through 10.4.1 When thinking on a way to answer this question using ImageFilter I have found (with Jason B's help) that we can ...
243 views

### How to detect end points in a binarize picture

There is a picture: When I try to use MorphologicalTransform to detect the end points ...
251 views

### Find the Panda and the Cat - Dudolf puzzle

I recently find this puzzle where you have to find the panda from a group of snowmen. Having a horrible eyesight I have to take help of mathematica to find it. I start with assumption that all ...
37 views

### How to select very small components in an image

I have been trying to identify the centroids or positions of the small yellow dots (not the large regions) in the image below. I have adopted the following strategy (please see the code), however, i ...
79 views

### How to turn a Graphics primitive into a list of data?

I tried something small first, to get a feeling about this. So I defined a Rectangle[], placed it in a corner of ...
91 views

### Terser way to get the intensity of one pixel

I want a function to return the intensity of one pixel notwithstanding the Color Space of the source image. I wrote: ...
129 views

### ImageData reverses the order of the row of an Image [duplicate]

Could someone convince me what is the utility of doing a function like ImageData that reverses the order of rows in an image? Why was it coded like this? Why does ...
2k views

### Creating 3D dice

How to create an image of a 3D die from the 2D images? There is an example in the Documentation Center I tried but it doesn't work.
108 views

### Detecting rectangle shape from an image

Motivation: I want to automate the process of analyzing "Electron SpectroMeter (ESM)" data. ESM uses magnets to bend electrons so that electrons with different energy are separated spatially. ESM ...
2k views

### Fit image of mountain to gaussian

I want to detect the edges of an image of a mountain and then fit that to a gaussian. I am unsure about how to only get the mountain edge, rather than every single edge in the image. How do I ...
119 views

### Share a method to patch the discontinuous line in a image

Similar to this post which I have posted before(How to patch fingerprint ridges),Its solution's level higher than my expectation.So cost my these days to research this.Now I'm glad to share my fruit ...
157 views

### Zigzag ordered encoding of DCT co-efficients

I am doing DCT steganography. I have obtained a matrix of DCT co-efficient. I now want to perform zig-zag ordered encoding. The matrix is as follows ...
63 views

### Inpaint command use in Extending Van Gogh’s Starry Night with Inpainting

I'm trying to have some fun with the Wolfram Blog and am reading Extending Van Gogh’s Starry Night with Inpainting. He has this first image: My first question is how did he get the black and white ...
112 views

### Using mask to segment growing cells over multiple timepoints

I am trying to segment some very irregular cells out of images generated by timelapse microscopy. These cells don't fit any simple shape (not circular or elliptical) and they grow and change shape ...
321 views

### Finding objects in images with inhomogeneous background

I have the following image where bright circular shaped objects are seen. The image has usually an inhomogeneous background and ...
83 views

### Remove shaded relief effect from an image [closed]

Thank you everyone for your comments. This is my edited version of the question. I've got a shaded relief effect map that is showing topography data of an area. Each color represent an elevation ...
64 views

### Adding the row and columns as frame ticks

This code: i = Import["ExampleData/ocelot.jpg"]; Show[i, Frame -> True] Gives this image. However, the margins have indices measured from the lower left ...
148 views

### Size of a square object in an image

I recorded the following image (28$\times$28 pixels) showing a bright square object (I used a square object of 35 micrometers side length and imaged it with a ...
114 views

### Can I set the alpha channel in a GIF image?

I have an image in GIF format: I want to set the alpha channel in this GIF. ...
836 views

### How to merge several partially overlapping screenshots into one image?

I have two screenshots: For a long screenshot picture I usually use PhotoShop to combine both images: How do I use Mathematica to make an automated program to do this? This is my current semi-...
163 views

### Can I split an image into subparts automatically?

I want to extract subimages from an image like below. There are 6 components in the image, I want to crop this image into 6 images in a way each individual image contain only 1 component. Can I ...
99 views

### Object detection in image

I have the following image, with a "large" object and 3 visible bright pixels: What I do not understand: Why do I count in the this ...
2k views

### Create “Ostagram” like Images using Wavelet Transforms

I am trying to make an "ostagram" like image using wavelet transforms and image keypoints. See the following link: https://www.facebook.com/ostagram/ This is done using neural networks, which I at ...
37 views

### Dynamic ImageHistogram [closed]

I want to plot dynamic "ImageHistogram" from by using my pc web camera I tried this: ...
86 views

### Determining the coordinates of the BoundingBox of an object in an image [closed]

I want to calculate and store the coordinates of the bounding box of the object area. I developed the following code, but it does not give the expected result. How can I fix it? ...
138 views

### How to find the Andromeda Galaxy

I would like to find the Andromeda Galaxy ($M31$) with the unaided eye. One way is to use the following image and graphic but I can’t find it just by looking in a dark sky. It is hard to detect ...
440 views

### How to align rotated images vertically

I have recorded images of a calibration target which I use to determine the resolution of a camera. For that I measure the distance of the parallel bright bars by measuring the brightness variation ...
151 views

### Fibonacci spiral in sunflower

How to find and detect the Fibonacci spiral in sunflower image? and how to get the following graph from initial image?
95 views

### How to interactively transform an image (rotate / translate / etc) on a per-component basis?

I have binary images like this one and I want to be able to interactively select its components and rotate them around its centroid by a different angle for each component. I may also want to ...
130 views

### ImageData to Image conversion

I assumed that Image and ImageData are inverses, so that the following expression gives back the original image. ...
213 views

### Find Background noise in Image

I have a set of 12 Images of a time dependent process. The Images also contain a static noise, which I want to get rid of. I had an idea to do that manually by looking at differences of images and ...
155 views

### Calculate area of black sea from image [duplicate]

There is a image of Black Sea from "Google Earth". I want to calculate area of black sea from this image using Mathematica The length of yellow line on this image is $100$ km (scale.) I try to ...
364 views

### Rotate an object in image about its centroid

I want to rotate an object in a image about its centroid. here is my code but the result is not as expected. Normally the centroid of the object does not change, except the case when the object is ...