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# Philip

### University of Surrey

Active since 2011

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Question

drawing on an image in loop
How can I draw on an from loop iterations, without 'imread' and 'imwrite'? EDIT: Inside the loop, I am doing some processing ...

11 years ago | 2 answers | 0

### 2

Question

Auto fill an image based on edge line
Is there a way to automatically fill an image (as though using the paint bucket tool in Photoshop) based on a line that runs fro...

11 years ago | 2 answers | 0

### 2

Question

Analyse the "Gibbs Phenomenon" from Image Data
Slightly related to my previous post regarding the ringing artifact in compressed images, I have a question regarding the Gibb's...

11 years ago | 0 answers | 0

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Question

Image data as a sine wave?
Does anybody know if it is possible to represent image data as a sine wave?

11 years ago | 1 answer | 0

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Question

What statistical features can I use to distinguish these images?
I have two 25x25 pixel images that are quite similar: A: http://imageshack.us/photo/my-images/546/18lwin.png/ B: http://imag...

11 years ago | 0 answers | 0

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Question

'closeness' of multiple vectors
Is there a way to compute how 'closely' a data vector matches another? For example: A = [1 2 3 4 5]; B = [1 2 3 4 5...

11 years ago | 1 answer | 0

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Question

Find smallest cell in cell array
Is there a way to find the smallest sized cell in a cell array? Thanks!

11 years ago | 1 answer | 0

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Dump Image Pixels into vector from coordinates
On a similar note, is there any way that I can replace the following loop: label_ids = [1 3 11 24 55]; map = zeros(heigh...

11 years ago | 0

Question

Dump Image Pixels into vector from coordinates
Is there a way to use 2 vectors of pixel coordinates to quickly dump the pixel values into a 3rd vector? Currently, I am usin...

11 years ago | 3 answers | 0

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Question

Image Edges: Calculate complexity of a line segment?
Can anyone suggest a good way to calculate the 'complexity' of a line segment (obtained from 'bwlabel' after 'canny' edge detect...

11 years ago | 3 answers | 0

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Question

Image Processing: Near/Far Objects
Does anyone know of any techniques that make it possible to work out how close an object is to the camera (when the image was ca...

11 years ago | 1 answer | 0

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Question

Canny Edge Detection - Automatic/Adaptive Thresholding
I have read in the docs for the 'edge' function that when a low and high threshold are not defined when calling the 'canny' edge...

11 years ago | 4 answers | 1

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Question

Sobel Edge Thresholds
I would like to test several sobel edge threshold values to identify which threshold is the best suited to a particular task... ...

12 years ago | 3 answers | 0

### 3

Question

Change how this plot looks
Is there a way to modify the attached plot in MATLAB, such that it contains another y-axis on the right hand side called "ADR" (...

12 years ago | 1 answer | 0

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Question

Extract all red pixels from image to binary image
Does anybody know of a way to extract all 'red' values [255 0 0] from an image to make a binary image where 1's indicate the loc...

12 years ago | 2 answers | 1

### 2

Question

Dilate a line and color both sides
Does anyone know if it's possible to dilate a line in an image, such that one side of the original line is colored red, and the ...

12 years ago | 2 answers | 0

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Question

Create new binary image from pixel values of another image
I have a grayscale uint8 image, and I want to create a second image that is mostly zeros, but has a 1 wherever the pixel value i...

12 years ago | 3 answers | 1

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Question

Dictionaries of Hashtables in MATLAB?
Hi all, Is there a way to create a hash table or dictionary in MATLAB such that I can retrieve a set of values based on a key...

12 years ago | 2 answers | 0

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Question

Draw a straight line in image, given an angle
Is there a way to draw a straight line in an image from a starting (x,y) coordinate, such that the line is equivalent to a speci...

12 years ago | 2 answers | 0

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Question

Rotate image about a specified pixel coordinate
Does anyone know of a way to rotate an image about a specified pixel coordinate? If I have the pixel coordinates (50,55) for ex...

12 years ago | 2 answers | 0

### 2

Question

Normal vector of line based on pixel coordinates
I have an array that contains the x,y pixel coordinates of edges in an image. I want to use three of these coordinates at a tim...

12 years ago | 2 answers | 1

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Question

Image Processing: Break straight lines
I have an edge image of a square, and would like to treat it as 4 separate lines: 2 horizontal and 2 vertical. Is there a way t...

12 years ago | 2 answers | 0

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Question

sort a structure
Is it possible to create a structure that holds the following information: * id_number * length such that I can then sort...

12 years ago | 1 answer | 0

### 1

Question

Image Processing: Find nearest nonzero pixel value to specified pixel coordinates
Is there a way to find the closest non-zero pixel value to specified x,y coordinates of an image by shifting only the horizontal...

12 years ago | 1 answer | 0

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Question

Image Processing: Find Edge with Highest Contrast
Is it possible to scan an image to find only the edge with the highest dynamic range to its left and right. At first I want to ...

12 years ago | 2 answers | 0

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Question

Image Processing: Keep only highest "intensity" values
Does anyone know of a way that I can reduce the following image to an image that only includes the highest intensities (for want...

12 years ago | 1 answer | 0

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Question

Dear all, I have two values representing the max and min of a data vector. max_val = 0.9855; min_val = 0.9851; Bot...

12 years ago | 3 answers | 3

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"Fill" Binary Image
Thanks for your help! I really must read the literature for morphological operations... The erode and dilate methodology seems...

12 years ago | 0

Question

"Fill" Binary Image
Hi, Is there a way to "fill" a binary image such that textured regions become black? As an example, I would like to make thi...

12 years ago | 3 answers | 0

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Question

Edge direction
Is there a function to check if an edge changes direction? I have used bwlabel to work on connected edges, but now I only w...

12 years ago | 1 answer | 0