Join David Powers for an in-depth discussion in this video Using subimage-search in ImageMagick, part of Code Clinic: PHP.
-Let's step away from the php code for a moment…to examine how to find sub-images…using Image Magic.…Image Magic is normally run from the command line,…so I've opened a Windows command prompt.…If you're working on Mac or Linux, you need…to open a terminal window.…Image Magic is in my computer's path,…so I can change to the directory…where I want to work.…So let's do that.…I need to go to the server root, which is…in the C drive, in zemp ht docs, and we're…working in php clinic, problem zero two.…
And I'm going to change to the scaled folder.…The reason I'm doing that is I want to work…with the re-sized images.…Trying to do this with the full-sized ones…would take an extremely long time.…To find sub-images, you use Image Magic's…compare program with the sub-image search option.…You also need to specify a metric that determines…how the images are analyzed.…I've found the mean absolute error metric…gives reliable results.…So let's begin.…Compare, then hyphen metric,…mae, that's the mean absolute error.…
Next we need the sub-image search option.…
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
Q: I'm encountering script errors message with the prime_dates.php file used in the "Priming the date_record column" movie in this course. How can I resolve these errors?
A: To avoid script errors, use bindValue() instead of bindParam() in
Line 9 of the prime_dates.php file. You can also download the latest
copy of the exercise files, which corrects this issue for you. For a
more in-depth explanation of the difference between bindValue() and
bindParam(), check out the "Binding input and output values" video (http://www.lynda.com/PHP-
Q: Why can't I access the Lake Pend Orielle site (http://lpo.dt.navy.mil)?
A: The Lake Pend Orielle site is not accessible in some geographical areas. We have contacted the owner of the server to try to resolve this issue.
Q: I am unable to access the Lake Pend Oreille data from outside the U.S.
A: A static copy of this data is provided here for lynda.com members outside of the U.S
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
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