Mono Captcha

Simple

English

Let's teach Stephan to recognize simple numbers. The Robots use monospaced fonts with low resolution. You can see the font on the picture below. This font has noise immunity to one-pixel error.

font font

Your program should read the number shown in an image encoded as a binary matrix. Each digit can contain a wrong pixel, but no more than one for each digit. The space between digits is equal to one pixel (just think about "1" which is narrower than other letters, but has a width of 3 pixels).

captcha captcha

Input: An image as a list of lists with 1 or 0.

Output: The number as an integer.

Example:

checkio([[0, 1, 1, 1, 0, 0, 1, 1, 0, 1, 0, 1, 0],
         [0, 0, 0, 1, 0, 1, 0, 1, 0, 1, 0, 1, 0],
         [0, 0, 1, 0, 0, 1, 1, 1, 0, 1, 1, 1, 0],
         [0, 0, 0, 1, 0, 0, 0, 1, 0, 0, 0, 1, 0],
         [0, 1, 1, 1, 0, 1, 1, 0, 0, 0, 0, 1, 0]]) == 394
checkio([[0, 1, 1, 1, 0, 0, 1, 1, 0, 1, 1, 1, 0],
         [0, 0, 0, 1, 0, 1, 0, 1, 0, 1, 0, 1, 0],
         [0, 0, 1, 0, 0, 1, 1, 1, 0, 1, 1, 1, 0],
         [0, 1, 0, 1, 0, 1, 0, 1, 0, 0, 0, 1, 0],
         [0, 1, 1, 1, 0, 1, 1, 0, 0, 0, 0, 1, 0]]) == 394

How it is used: This task will show you how optical character recognition works and will familiarize you with low-resolution fonts requiring noise-immunity. This can be useful for the systems that required the reliability.

Precondition: matrix_rows == 5
5 ≤ matrix_columns < 30
∀ x ∈ matrix : x == 0 or x == 1
digit_width == 3
Each digit contains no more than one wrong pixel.
digits_space == 1

by:

Rating: 17 Login to vote

Solve as a guest
Sign in to your account

Settings

Code:

Auto close brackets and quotes
Highlight the same word

Other:

Auto scroll to the best solutions after successful check
Do not show the best solutions (but those are still available after "View All Solutions" button)

Invalid hot key. Each hot key should be unique and valid

Hot keys:

to Run Code:
to Check Solution:
to Stop:

Save & Reload Close

CheckiO Extensions

CheckiO Extensions allow you to use local files to solve missions. More info in a blog post.

In order to install CheckiO client you'll need installed Python (version at least 3.8)

Install CheckiO Client first:

pip3 install checkio_client

Configure your tool

checkio --domain=py config --key=

Sync solutions into your local folder

checkio sync

(in beta testing) Launch local server so your browser can use it and sync solution between local file end extension on the fly. (doesn't work for safari)