emva1288 0.1.2

EMVA1288 reference implementation

EMVA1288

This is the reference implementation for the EMVA1288 Standard for Measurement and Presentation of Specifications for Machine Vision Sensors and Cameras.

Please visit Emva1288 Website for information and latest releases of the standard.

Installation

For inexperienced windows users it is recommended to use a prepackaged python distribution that contains the required packages. One excellent option for Windows users is Anaconda

Once the python environment is installed just run pip install emva1288

Description

If you are in a rush there is one utility class that allows to do the full process in a very simple way

from emva1288 import Emva1288

# Load your data descriptor file
e = Emva1288(filename)
# Print the results
e.results()
# Plot the graphics
e.plot()

If you are interested keep reading.

The code is dvidided in 7 parts

parser.ParseEmvaDescriptorFile

This class takes an EMVA1288 descriptor file and loads its content into a python dictionary.

An EMVA1288 descriptor file is a file that contains the description of an EMVA1288 test including exposure times, photon count and corresponding images

Example of a descriptor file

loader.LoadImageData

This class takes a dictionary (product of parser.ParseEmvaDescriptorFile). Load the related images and reduce it’s data to the minimum possible, preserving all relevant image data in as integers. The resulting data is a Python dictionary.

Example of the reduced data

data.Data1288

This class takes a dictionary with image data (product of loader.LoadImageData), and transforms it into data that can be used for the EMVA1288 computations. It is important to note, that this is separate from LoadImageData because this step, produces float values that are not easily transportable (db, json, etc…) without loosing accuracy.

results.Results1288

This class takes the data from data.Data1288 and compute the actual EMVA1288 values.

plotting.Plotting1288

This class takes a results.Results1288 object and produces all the plots needed to create a reference datasheet of the EMVA1288 test

Usage

To use the code, you need to have a set of images that correspond to an EMVA1288 test. There are some sample image sets provided by the standard development group. Example datasets.

Download one or all of these datasets, extract its content, and use them as input in the examples shown below.

Examples

• A simple example

• Step by step example