Questions tagged [image]

This tag is for questions related to the loading, formatting, saving, compression, and display of data representing pictures.

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4
votes
1answer
40 views

Command line utility to convert image formats of photos

Below is some code for a basic command line utility to convert image formats of photos. I'm wondering how any part of it might be written with better style, i.e. how it could be neater, clearer and ...
6
votes
1answer
144 views

Python class for organizing images for machine learning

I built a class to help me handle image data to use in machine learning. I thought that there would be a pre-existing package that did what I wanted but I couldn't find it so I wrote this. I am not ...
3
votes
1answer
65 views

Apply a sepia filter to an image

I'm writing a simple function that applies a Sepia filter to an image. My function works, but I'm a beginner gopher. So I would like to know if there is a way to improve the code. I usually code in ...
1
vote
0answers
40 views

ViewModels for image transformations

In my project I have a chain of Fragments where each one gets a bitmap, manipulates it, then sends it to another fragment for more processing. My fragment chain looks like this: CaptureFragment -> ...
15
votes
3answers
8k views

Change desktop background

I've created a simple program that downloads an image (different image every day), then sets it as my desktop background. It is a console application, and closes immediately after downloading the ...
5
votes
1answer
50 views

Rust code of a tree fractal

I just picked up Rust recently and this is my first program (longer than 10 lines at least) so I'm looking for constructs that are more native and natural to Rust. I come from a c++/ python background....
3
votes
1answer
60 views

Stereo image matching implementation in Halide

The authors of this paper compute support_points of a 900×700 image in 118 ms. I have implemented their algorithm below in Halide. In my algorithm, the nested for loops over length and width iterate ...
16
votes
4answers
9k views

Processing an image to extract green-screen mask

I am using OpenCV to process an image, and in my code, I have to check / edit each pixel separately: ...
1
vote
1answer
29 views

Rails controller method to show an optionally scaled image using MiniMagick

I've got below implementation for my controller and show action which implements MiniMagick gem. I've just wondering is there any better way to write it down? If ...
8
votes
1answer
138 views

Bilinear image interpolation

I have written a bilinear interpolant, which is working moderately well except that is painfuly slow. How can rewrite the code to make it faster? Using opencv directly isn't a valid answer. ...
2
votes
1answer
58 views

Image Processing - Comparing 2 images and Ranking Similarity

My code compares 2 images of any shape/dimension and ranks them in order of similarity. It starts with reading from a CSV file with columns image1, image2 which contain absolute paths and then ...
5
votes
3answers
608 views

FFT Convolution

I have written the following routines to convolve two images in the frequency domain which are represented as 2d Complex arrays. How can I optimize my routines for better performance? ...
0
votes
1answer
31 views

Upload image with GD library

First of all I just started learning OOP. My priority is to make safe code. I think my code is safe, because I use GD to make a copy of the uploaded image and I use an image proxy to make sure nobody ...
5
votes
0answers
37 views

Interfaces and OOP Design for Image Editor software

I'm new to C++ programming, and I'm building an Image Editor software like Lightroom/CameraRaw from scratch. Apart from procedural code (actually seems that all the functions works correctly) my goal ...
6
votes
0answers
27 views

Drawing a line in any direction with pixels

I am doing an image drawing and rendering library, and would like some feedback on this code, it simply draws a line in any direction. The equation for that is: m = (y2 - y1) / (x2 - x1) b = y1 - m ...
3
votes
1answer
170 views

Design pattern: image downloads

This is an image representation of my code below: This is what they do: CellWithImageX: Subclasses of UITableViewCell. They have an image and an loading indicator....
4
votes
2answers
79 views

Edge detection in a canvas

I have one function in my code to detect edges in a canvas but it's the slowest part of my code and is used everywhere. If I could just optimise this, my whole program would speed up considerably. ...
4
votes
1answer
68 views

Getting hex colours from a image

I am trying to get the hex colours from an image. The problem I am having is that for some reason randomly the code causes high CPU usage, which times out the browser and I am not sure how to optimise ...
3
votes
1answer
589 views

jQuery image carousel

I have made this custom image carousel, using HTML5, jQuery and CSS. My aim was to make it really lightweight but with (just) enough features: "bullets", auto-advance, responsiveness. ...
2
votes
0answers
19 views

Create mosaic task #2

This post is a continuation of post here: Create mosaic task. I improved code readability, hopefully it'll be reviewable now. Once again, I'm asking for tips to write better code. Task: The point ...
5
votes
0answers
45 views

Tensorflow loop to analyze gradients derived from MRI and PET images

The code shown below takes the partial derivative of each pixel of the output fused image of a neural network with respect to input image of the neural network using tensorflow's ...
1
vote
1answer
91 views

Optimizing custom JPEG decompression

The aim of my code is to decode an image format that is based on the JPEG chain of compression/decompression, however it is not compatible with the default JPEG flow as far as I know, since all ...
3
votes
0answers
100 views

Converts audio files to fixed size chunks and the chunks to spectrogram images

This code takes in input as audio files (.wav or .WAV) and divides them into fixed-size (chunkSize in seconds) samples. Then these chunks are converted to spectrogram images after applying PCEN (Per-...
5
votes
1answer
115 views

Create mosaic task

I tried to apply for software engineer - intern with this task, and there is no reply since I sent it, so I guess I failed. Can you give me a direction in what way I should improve my code? Task: The ...
11
votes
1answer
57 views

Visualization of the Pythagorean theorem

Background The Pythagorean theorem asserts that for a right triangle with hypotenuse \$c\$ and other sides \$a\$ and \$b\$, the area of the square placed upon \$c\$ is equal to the sum of the areas ...
7
votes
1answer
40 views

Bash script to encode images in base64 and generate a CSS file from them

These are the first lines of code I've ever written. I've been interested in the idea of learning to program for quite a while, but never really pulled the trigger, and now I've been playing around ...
2
votes
0answers
22 views

jQuery code to display images served by PHP, without reloading

My php page displays a slider of images and when the user clicks on an image(.item), the div below (#team_single) changes the content without reloading the page. Content of the div changes also when ...
6
votes
1answer
56 views

Get nearest major city of an image (using EXIF GPS data)

I am writing a program that will take images in a folder, get the GPS Coordinates (from the EXIF data), then return the closest "major city". (I define a major city as one with an airport, so ...
1
vote
0answers
40 views

Proper image sizes in WordPress

I wanted to create a set of functions that would allow me to easily implement images for multiple screen resolutions in my custom page templates. WordPress offers some functionality for implementing ...
1
vote
0answers
36 views

Python3 - Cropping PDF files according to coordinates

I have a python script, that is performing OCR on PDF pages. I am trying to do so I can provide coordinates to the script - so it will only select the text within the provided coordinates ...
1
vote
0answers
55 views

JavaFX lazy loading of images in TableView

This code is based off https://stackoverflow.com/questions/25711103/javafx-combobox-lazy-loading-images but modified to work with a TableCell Firstly, the model object should have an observable ...
4
votes
1answer
55 views

U-Net: A TensorFlow model

What I want to know I am writing a ML model called U-Net with Python (and TensorFlow). My question is not about the machine learning or Tensorflow, I want to know the best structure of the code. I ...
5
votes
1answer
3k views

Converting a vector image to matrix

I am playing with the cifar-10 dataset (available here) and for now I would like to plot one of the images of a batch. The images are represented as vectors when I get them from pickle: From the ...
3
votes
1answer
455 views

Creating an image in Excel using the colors from an input image

I'm having some performance issues in this code and need some suggestions on how to improve it. I'm not interested in "general code style" improvements unless they have performance implications. The ...
3
votes
0answers
32 views

Pygame : processing speed independant image loop displayer

I made this in order to teach myself pygame. This displays an images loop at the same speed on any computer (It will lag on a slow computer). Is my time management good or do my datetime call could ...
5
votes
1answer
91 views

Find png files in folder structure and map them to Photoshop groups and layers

I've created a heavily problematic code that works. Summary: It looks through a folder structure, for png files and tries to replicate this structure in Photoshop. Files are mapped layers and Folders ...
4
votes
2answers
92 views

Binary genetic programming image classifier's fitness function

I am trying to figure out how to improve my binary image genetic programming classifier's fitness. It takes images and classifies them if it has some feature X or not in it. These are the main ...
4
votes
1answer
1k views

NSURLSession load images on demand

I'm trying to come up with a system to populate my item images on demand, this is what I have so far. One obvious bug is that an item image could be downloaded multiple time since the ...
5
votes
1answer
62 views

Extracting watermark from a video using Python

I'm extracting a few frames from a video: Comparing the similarity or equality of pixel color (from first two images) Saving to a new image Comparing the new image (conjunction of first two images) ...
6
votes
1answer
78 views

Per pixel Image Computation with Gamma Correction in OpenGL and C [closed]

I've been working on a way to optimize pixel computation in OpenGL with C. If this information helps, my current environtment = Linux (terminal) + GPU (Nvidia 1080Ti). I'm working with old OpenGL (...
7
votes
1answer
572 views

Motion detection program for snapping of images

I'm doing a motion detection program where it snaps an image when it detects movement and snaps an image of the person's face if in view while this is all recorded and sends it all to Dropbox. It's ...
12
votes
1answer
194 views

Replace color in image measured by Euclidean distance

This script replaces the red hair in image to black color (replace one color to another) Three major parts in this script Not just replace color red to black, I hope the output image looks natural, ...
4
votes
1answer
7k views

Send blob image using Ajax/PHP

I have an image cropper that crops the uploaded image, Before sending it to the server using PHP and AJAX. Here is a live fiddle to preview a working cropping example. Here is the code: ...
35
votes
7answers
4k views

Increase performance creating Mandelbrot set in python

I created a program in python that generates an image of the mandelbrot set. The only problem I have is that the program is quite slow, it takes about a quarter of an hour to generate the following ...
13
votes
2answers
12k views

Read and write BMP file in C

I'm teaching myself a little C, and I've found this website. It has an exercise about manipulating a BMP file in C. I would like to know if I can make my code look more "idiomatic" or professional, ...
4
votes
2answers
114 views

C++ Pixel/Array manipulation libs

I was tired to always perform pixel manipulation one by one, so I started to create my own templated header to perform computation over pixel (RGB, or RGBA), but I also make it for ND for some cases. ...
6
votes
2answers
293 views

Haskell program to rename images based on EXIF data

Moved originally from StackOverflow, not knowing the existence of this sister site ... Must say I find programming in Haskell to require much more cognitive intensity than any other language I've ...
3
votes
2answers
119 views

WPF Bitmap / BitmapFrame to multi-page / multi-frame TIFF with JPEG encoding

I was searching for a long time how to write multi-page TIFFs with the JPEG encoding. TIFFs support JPEG encoded frames but the built-in encoder in .NET Framework does not have JPEG as a compression ...
1
vote
0answers
34 views

How to speed up the retrieval of the corners of a mask

I have trained a polygon detector neural network to recognize the mask of "quadrilateral" (the mask generates curvy lines so it's not exactly a quadrilateral). I would like to get the corners of the ...
2
votes
1answer
108 views

Making a catalog of pictures

Is there a way to make this code run faster? I have over 6000 pictures in .jpg optimized to a maximum of 40 kB. It starts quickly but after like 2000 pictures it runs way slower. The final .xlsm file ...