Questions on the image processing capabilities implemented in Mathematica.

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3
votes
1answer
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 ...
8
votes
2answers
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 ...
3
votes
1answer
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 ...
0
votes
0answers
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 ...
1
vote
1answer
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) ...
7
votes
2answers
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...
2
votes
0answers
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[...
0
votes
1answer
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 ...
20
votes
1answer
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 ...
0
votes
0answers
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 ...
15
votes
1answer
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 ...
3
votes
0answers
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 ...
3
votes
1answer
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 @ ...
0
votes
1answer
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 ...
11
votes
1answer
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: ...
7
votes
0answers
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 ...
1
vote
4answers
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 ...
15
votes
0answers
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 ...
0
votes
0answers
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 ...
3
votes
1answer
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 ...
5
votes
2answers
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: ...
2
votes
2answers
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 ...
13
votes
2answers
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.
4
votes
1answer
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 ...
13
votes
5answers
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 ...
4
votes
2answers
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 ...
3
votes
2answers
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 ...
0
votes
0answers
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 ...
4
votes
2answers
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 ...
7
votes
2answers
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 ...
3
votes
0answers
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 ...
4
votes
2answers
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 ...
4
votes
4answers
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 ...
1
vote
1answer
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. ...
24
votes
3answers
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-...
8
votes
1answer
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 ...
3
votes
1answer
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 ...
6
votes
0answers
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 ...
0
votes
1answer
37 views

Dynamic ImageHistogram [closed]

I want to plot dynamic "ImageHistogram" from by using my pc web camera I tried this: ...
0
votes
3answers
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? ...
4
votes
2answers
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 ...
10
votes
5answers
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 ...
3
votes
2answers
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?
7
votes
1answer
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 ...
8
votes
1answer
130 views

ImageData to Image conversion

I assumed that Image and ImageData are inverses, so that the following expression gives back the original image. ...
7
votes
3answers
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 ...
6
votes
2answers
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 ...
9
votes
2answers
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 ...
1
vote
0answers
80 views

How to refocus camera?

I'm trying to read a barcode though my computer's webcam but it fails because the ImageCapture won't refocus the camera when I put the code close to it, and this it is blurry: Is there anyway ...
5
votes
0answers
53 views

How many clusters does DominantColors return?

Is there any documentation on how it automatically chooses the number of colors - does it use X-means or some other heuristic to determine the number of clusters it automatically returns?