Join David Powers for an in-depth discussion in this video Calculating the scaling ratio, part of Code Clinic: PHP.
Before embarking on the PHP code…let's take a look at the ImageMagick documentation…for matching sub-images and shapes.…The key information is here.…It says the search basically does a compare…of the small image at every possible location…in the larger image.…As such, it's slow.…Very, very slow.…The best idea is to compare a very, very small sub-image…to find possible locations.…With that in mind,…the first task is to find out…how big the original images are…and calculate a scaling ratio…to generate smaller versions.…
So let's go to the PHP code.…In my editing program I've created a new file…called find underscore crop dot PHP…which is where I'll be building the main script.…I've saved it in the top level…of the problem 02 folder of my testing site.…I'm gonna begin by initializing some variables…that I'll paste in from variables dot txt…that you can find in the exercise files for this video.…The first four variables are the image folders…and then we've got three empty arrays for files…and their dimensions.…
To find the images that need to be tested…
David introduces challenges and provides an overview of his solutions in PHP. Challenges include topics such as statistical analysis, searching directories for images, and accessing peripheral devices.
Visit other courses in the series to see how to solve the exact same challenges in languages like C#, C++, Java, Python, and Ruby.
Skill Level Intermediate
PHP with MySQL Essential Trainingwith Kevin Skoglund14h 32m Beginner
Exporting Data to Files with PHPwith David Powers3h 42m Intermediate
Problem One: Statistical Analysis
Problem Two: Image Analysis
Problem Three: Eight Queens
Problem Four: Accessing Peripherals
Problem Five: Recursion and Directories
Problem Six: Building the Web
- Mark as unwatched
- Mark all as unwatched
Are you sure you want to mark all the videos in this course as unwatched?
This will not affect your course history, your reports, or your certificates of completion for this course.Cancel
Take notes with your new membership!
Type in the entry box, then click Enter to save your note.
1:30Press on any video thumbnail to jump immediately to the timecode shown.
Notes are saved with you account but can also be exported as plain text, MS Word, PDF, Google Doc, or Evernote.