Linked Questions

1
vote
0answers
39 views

How to find a stop sign in a picture. Is ComponentMeasurements feasible? [duplicate]

To be simple, to find the stop signs is to find the red octagons in the pictures. There may be several stop signs in one pictures and how to find all of them?
197
votes
2answers
40k views

Help find a bright object on Mars!

In today's news, scientists found a bright object on one of Curiosity's photos (it's near the bottom of the picture below). It's a bit tricky to find - I actually spent quite some time staring at the ...
33
votes
5answers
11k views

How can I detect an ellipse in a photo?

I tried to detect the rim of the following cup as an ellipse. I've tried the solutions given in How to find circular objects in an image? to detect the ellipse, but the detection result was not quite ...
39
votes
2answers
3k views

Find radii of concentric circles in image

I have an image of concentric circles, I would like to find the radii of the circles (only the innermost few are important). I've had a go using what I could find in previous posts, but am a bit ...
11
votes
1answer
2k views

detecting the radius of an incomplete circle

I need your help to detect the radius of the blue circle in images like this: . Reading these questions: 1, 2, 3, I figured that this code taken from @halirutan answer to question n°3 could help: <...
16
votes
2answers
373 views

Counts and Sizes of Highly Overlapped/Contacted Particles from Microscopic Image

Dear all below is an image from microscope that I have a hard time doing image processing to get the particle counts and the corresponding sizes (the large one is around 1 micron). The way I did was ...
4
votes
2answers
623 views

Identify circles in Image and make list of all diameters

I have this SEM image: I would like to make a list of all diameters of each circle. Can I somehow let Mathematic identify the circles (approx.) and extract the diameters ?
7
votes
1answer
475 views

How to perform noisy circle detection

I want to detect circles that are embedded in noise. For this I created a few circles with some defined signal-to-noise ratio: ...
7
votes
2answers
419 views

Analysis of many similar x-ray Images

From a 3d x-ray scan, I have many similar slices to analyze. Is there a way to determine the position of the three rectangles and the inner circle?
4
votes
0answers
1k views

looking for a generalised Hough Transform function or a least a function to locate circles

I am looking for a generalised Hough Transform function or a least a function to locate circles (position of center and radius) in a image. There is the standard Hough line search function (ImageLines)...
2
votes
1answer
210 views

Determine circle sizes in picture

I need to determine the size of the 16 circles. Therefore I tried to binarize the picture to get the 16 circles, but i failed. I used a combination of Binarize, EdgeDetect and FillingTransform. But ...
1
vote
0answers
90 views

How to locate a text string in a picture?

We can use TextRecognize to recognize lines of text and their corresponding bounding boxes. For the text in the picture below, how can we detect the bounding boxs of the text in the picture. The ...