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Blob analysis with OpenCV in Python

Posted 10th December 2021

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Here’s my methodology for performing a blob analysis from binary images in OpenCV using Python code.

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Fit an inscribing circle to a shape in OpenCV

Posted 30th October 2021

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The largest possible circle that can be drawn interior to a plane figure is called an inscribing circle. This can easily be fitted to a binary shape in OpenCV.

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Skip cells when running Jupyter Notebook scripts

Posted 27th September 2021

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There is a surprisingly simple way to turn off specific cells in Jupyter Notebook without having to manually comment-out chunks of code.

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Bounding rectangles in Python OpenCV

Posted 20th July 2021

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There are two methods in OpenCV to derive a bounding rectangle and extract the relevant values of an object or series of objects in an image.

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Managing RAW photos with Python

Posted 23rd April 2021

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Use Python to recursively scan directories and remove unused and redundant CR2 files.

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Convert RGB to CMYK in Python

Posted 26th March 2021

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Efficient Python code for taking a RGB image and converting it to CMYK before splitting the relevant channels out.

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Structural Similarity Index (SSIM) in Python

Posted 19th February 2021

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Quantitatively check the quality of a compressed image using a simple Python code for calculating the Structural Similarity Index (SSIM) and Mean Square Errors (MSE) between two images.

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Peak Signal-to-Noise Ratio (PSNR) in Python

Posted 12th February 2021

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Quantitatively check the quality of a compressed image using a simple Python code for calculating the Peak Signal-to-Noise Ratio (PSNR) between two images.

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Reading EXIF data in Python

Posted 2nd February 2021

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In order to review the properties of various common-format image files, I wrote a command-prompt script in Python that will display EXIF data and other properties of JPG, PNG, TIF, CR2 and NEF files.

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Query a PostgreSQL database via Python

Posted 11th December 2020

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Use this simple template script created in Python to connect to your PostgreSQL database and run a query.

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