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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12 views

Simple two-mode camera for graphics engine

I have a camera class that I use with my graphics engine prototype. For context, the graphics engine is written in OpenGL(4.1) using Qt-bindings (PySide2), since I also used Qt as my window and ...
3
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0answers
89 views

Taking a screenshot of a particular window

I've got a function which takes a screenshot of a particular window. It's important that the screenshot works whether the window is focused/covered by other windows or not, hence why I've used ...
4
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1answer
78 views

Generating PNG barcodes through a GUI

This is a continuation of my earlier question, now updated to use a basic GUI. This is my first time using tkinter so I suspect there are a fair few things I'm missing! I've also added the ability to ...
9
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2answers
602 views

Generating PNG barcodes from a CSV

I wrote the following code to generate a series of barcodes given a CSV with a list of ISBNs in the first column and titles in the second, using the python-barcode library (which itself requires ...
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36 views

Python Max/Average Pooling Class

I am writing a simple module that performs CNN steps to get a deeper understanding of how it works. I have here written a class that performs average and max pooling to a given image ...
21
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7answers
6k views

Converting JPG images to PNG

I had a task to convert some JPG images into PNG format using Python. I successfully did it but I was wondering if somehow I could make my code better than my current one. Code - ...
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0answers
66 views

Multi-threaded image convolution/pooling-python

This multi-threaded code takes an array of 3d images and applies the convolution function with padding, stride, pad values .. as parameters and same applies for creating pooling layers. I need ...
2
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2answers
104 views

Bitmap in Bitmap (Black & white)

Below is my attempt at bitmap in bitmap searching using 1bpp bitmaps. Any suggestions on how I can reduce complexity and improve speed? Any comment is appreciated. ...
6
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2answers
101 views

Compressing large jpeg images

I'm working with thousands of large image files in a regularly updated library. The following script does the job (on average reduces my file size ~95%) but costs me around 25 seconds to compress one ...
6
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1answer
61 views

Automatic picture selector

I'm working on a project for digital marketing, I want to automate the upload of pictures. The program itself isn't done but here I came up with a way to keep track of which and when pictures have ...
2
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0answers
44 views

Generate Black and White confidence map masks for joints, same as OpenPose/Convolutional Pose Machines

Attached below is my code for generating the confidence maps for the joint locations, it is in the same vein as the maps generated for the paper Convolutional Pose Machines and OpenPose. I am ...
1
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1answer
56 views

Image type convertion

So I have a piece a code that, altough it does what is expected, it doesn't seam very performant to me. I just wanted to know if there's a better way to do this or if my code is alright as it is. The ...
2
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1answer
71 views

Flash Light Effect Windows Forms Edited

I am having performence issues with image processing task (flash light effect). I used c#, and used couple references (LockBits Method, Extension). The program has bad frame rates. Edited the code, ...
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1answer
72 views

Convert image to grayscale

To convert JPEG file, C function, bgraToGrayscale is called from Swift. Is there a better way to 1.allocate memory and 2.access pointers than the ways they have been done in code below? And ...
5
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1answer
39 views

Command line python script to generate image with n digits from MNIST data

A Python script to generate an image with a given number of digits from MNIST data on a single row. Via arguments, the following can be specified (all optional, with defaults if necessary): width of ...
9
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0answers
106 views

Generated Minecraft stone texture in R

I needed a Minecraft-like stone texture, instead of creating it using image editing software I decided to generate one using R. The idea is to create some noise and stretch it horizontally so the ...
6
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2answers
204 views

Image edge detection

I have a Canny Edge Detection Code written in C++. I would like to know how can I make it more robust in terms of detecting all the edges correctly and save it? Is this the best possible edge ...
4
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0answers
35 views

Better performance in read/write data structure + byte

I am writing a program to compress an image using Huffman encoding and I need to write the data structure and the byte file. After that, I have to read/decode it. I realize that my read and write is ...
2
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1answer
93 views

My custom implementation of MATLAB's imdilate

I have been assigned to implement the morphological dilation operation without using MATLAB's imdilate, and I came up with the following solution: ...
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3answers
2k views

Hough transform algorithm - Idiomatic c++

I've got some working code to compute the Hough transform for circles: ...
5
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3answers
114 views

Image filtering application

I'm building an image filtering application, and I'm new to the Java frameworks that I need to do so. Right now, I can apply a simple 3x3 kernel blur to my thing by overwriting the RGB values of the ...
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0answers
22 views

React.js component to lazy-load image

I'm trying to design a better solution for img srcset with lazy load. Below is the code from the component responsible for lazy load img, maybe someone has a better way to achieve this effect. Full ...
4
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1answer
71 views

Read JPEG dimensions properly

I need to extract the dimensions (width and height) of a jpeg file for inserting in an html document. According to the JPEG image compression FAQ, cautions against what's commonly out there, Some ...
4
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1answer
120 views

C# handling of images - is this best for memory usage?

I am working with a system that needs to consume product images uploaded by employees and resize them / add white padding to the sides to create square images to be consumed by our e-commerce site. I'...
5
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2answers
88 views

Python image combiner reading writing

I am writing a simple script that will combine two images at a pixel level, selecting every other pixel from one image, and the other pixels from a second image. ...
3
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0answers
63 views

Simple vanilla JavaScript Carousel with tabs and pause button

I currently got into coding and I am completely self taught. Since I know that my code is far from being perfect, I am asking for advice and tips on how to improve. Feel free to drop in any comments ...
7
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1answer
78 views

Loading BitmapImages out of a Zip file

I'm working on a personal project to get better with C#, and as part of that I have a zip file with 20 or so images saved inside. I want to load those images out of the zip file and display them in my ...
4
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1answer
102 views

Expanding the region of interest of an image

I am solving a problem of increasing the ROI of a retinal image using the below algorithm- First, the set of pixels of the exterior border of the ROI is determined, i.e., pixels that are outside ...
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0answers
43 views

Caching image thumbnail web-application based on rocket

This is my first rocket web-app. It serves images from a directory and thumbnails from a sub-directory. if no thumbnail is found for an existing image it is created on the fly. Before I launch this ...
9
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1answer
377 views

Maze image solver and animator in Python

This maze solver is a continuation to the maze generator I posted here recently Maze generator & animator in Python This code takes an image containing a 2-color maze as input and solves the maze ...
14
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1answer
1k views

Maze generator & animator in Python

This is a follow up to this code and I still did not get the feedback on the drawing functions Maze generator in Python- Gif animator-Custom colors/sizes The code generates custom color and size ...
9
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1answer
329 views

Maze generator in Python- Gif animator-Custom colors/sizes

This Python code generates mazes with color and size customization. I intend to add several new maze generating algorithms(Sidewinder, Kruskal, Prim ...) to the Maze class but for now, there is only ...
1
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1answer
91 views

Add watermark to images

Recently, I started reading image processing via opencv library in python. I create a minio object storage and upload some photos into it. After that, I wrote a program which reads every image in ...
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0answers
37 views

Photo rename by Exif date and group into folders with a threshold

I wrote this tiny F# project yesterday, but I am a bit rusty and I would like to know if there is anything I can refactor and make more elegant. ...
5
votes
1answer
55 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 ...
3
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1answer
80 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 ...
2
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1answer
82 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 -> ...
3
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1answer
100 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 ...
5
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1answer
91 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....
2
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1answer
118 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 ...
8
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1answer
489 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. ...
1
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1answer
51 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 ...
0
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1answer
34 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
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0answers
40 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
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0answers
34 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 ...
4
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2answers
241 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. ...
2
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0answers
24 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
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0answers
54 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 ...
7
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1answer
55 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
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0answers
23 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 ...

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