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Posts Tagged ‘convert’

screenshot.py

July 26, 2015 Leave a comment

I made a simple wrapper script called screenshot.py that calls phantomjs and convert to do the real job. The advantage of screenshot.py is its very simple usage.

Usage

screenshot.py -full http://reddit.com full.jpg

Screenshot of the entire page (can be very high).

screenshot.py -window http://reddit.com window.jpg

Screenshot of the area that you see in the browser.

screenshot.py -thumb http://reddit.com thumb.jpg

Thumbnail of the area that you see in the browser.

Links

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Face detection with Python

Today I found an interesting post: Face Detection in Static Images with Python. You give an image as input and the program draws a rectangle around the face(s) on the image.

Installation

sudo apt-get install python-opencv libcv-dev opencv-doc

Under Ubuntu 11.04, the required XML is in the opencv-doc package at a different location, thus you need to modify the source code:

...
cascade = cvLoadHaarClassifierCascade(
    '/usr/share/doc/opencv-doc/examples/haarcascades/haarcascades/haarcascade_frontalface_default.xml.gz',
    cvSize(1,1))
...

See the full (patched) source code here.

Lesson learned
You can draw a rectangle on an image the following way:

convert original.jpg -stroke red -fill none -draw "rectangle 50,36 115,101" output.jpg

Where 50,36 is the top left, 115,101 is the bottom right coordinates.

/ @reddit /

Categories: python Tags: , , ,

unicode to ascii

December 17, 2010 Leave a comment

Problem

I had the following unicode string: “Kellemes √únnepeket!” that I wanted to simplify to this: “Kellemes Unnepeket!”, that is strip “√ú” to “U”. Furthermore, most of the strings were normal ascii, only some of them were in unicode.

Solution

import unicodedata

title = ...   # get the string somehow
try:
    # if the title is a unicode string, normalize it
    title = unicodedata.normalize('NFKD', title).encode('ascii','ignore')
except TypeError:
    # if it was not a unicode string => OK, do nothing
    pass

Credits

I used the following resources:

Categories: python Tags: , , ,