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QUESTION
I am trying to use openCV2 to automatically delineate the contours of churches and cathedrals from static maps.
In a nutshell, I am:
- scraping the building's coordinates from this Wikipedia page.
- creating a map centered on those coordinates using Folium, a Python library.
- saving the map as a jpg image.
- applying openCV2's
findContours
method to delineate the contours of the buildings.
I initially assumed that the cathedrals would be the largest building within a few hundred meters, so I sorted the contours by area following this PyImageSearch tutorial:
...ANSWER
Answered 2020-May-01 at 16:24I used cv2.moments(contour)
as shown in this article to get the center of each contour. Then you can use distance.euclidian
from the scipy.spatial
module to calculate the distance of each contour to the image center.
QUESTION
been trying to find the answer to why everybody converts an image to grayscale before processing?
For example, this website with instructions teaching people how to build a simple scanning program converts photo to greyscale first before passing commands to manipulate the image itself.
In the second example, this thread on stackoverflow shows a person also converts the image to grayscale before extracting text from his image.
Does this process make the image easier to manipulate? Or does it give better results when extracting text? If so, shouldn't a binary image give the best result in the case of extracting text?
...ANSWER
Answered 2020-Jan-15 at 02:10More often than not, grayscale has all the relevant information to complete a particular task. So reducing the image to grayscale greatly simplifies calculations and removes redundancies.
Binary image is great too but it sacrifices too many information for it to be useful in many cases. And most library supports a minimum of 8 bit image processing anyway for a true binary data structure to be useful.
Imagine having to create a program to recognize text on paper. Having a color image doesn't help you to better read the text. The text can be in various color but you can read the text even if its in black and white. You can argue that binary image should also give the same performance and that is true IF there are no noise such as shadow on the paper.
Once there are noise elements exist on the image, you will need more information to separate text from noise and that is when grayscale is useful.
Moreover the most used and reliable information for advanced image processing is the edges and its textures. Both which can be obtained from a grayscale image.
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Install mobile-document-scanner
You can use mobile-document-scanner like any standard Python library. You will need to make sure that you have a development environment consisting of a Python distribution including header files, a compiler, pip, and git installed. Make sure that your pip, setuptools, and wheel are up to date. When using pip it is generally recommended to install packages in a virtual environment to avoid changes to the system.
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