Detect Bounds of Elisa Plate

[jakeisnt]

Motivation

We currently don't have a way to detect the bounds of an image with a rectangle. It would be helpful to be able to identify a clear rectangle from the ELISA plate, similar to a banking app that allows for the scanning of checks or a scanning app that shows the user what is being identified as the page.

Task

Utilizing OpenCV, write a Python script to read in an image file, identify the ELISA plate present in the image file, then draw a bounding box around it to match the border of the plate. Display this with cv2.imshow() or similar with the bounding box drawn on the image to verify that the box has been drawn correctly.

Logistics

This is a script we can easily integrate into a camera module when constructing the application. There should be quite a few tutorials on something similar on OpenCV, but the general process is the following:

• convert the image to black and white
• obtain the contours of the image
• draw lines on important contours
• connect these lines to form a rectangle
• display such a rectangle on the image

Here are some tutorials to get started:

• detecting edges, lines and shapes
• identifying and detecting different shapes
• OpenCV rectangle detection on Android - logic should be easy to translate to python given that they're the same library
• finding bounding boxes and perspective warping on a game boy

There might be some trouble identifying the bounding box on surfaces of certain colors; part of the assignment will be determining what the best background would be for the user to use. If something like this is necessary, checking the background color should also be integrated into the application (we can do something as simple as (if background not in range of colors we allow, throw error)).

[jakeisnt]

Merged! #16