Digitizer

Extract numeric data from chart images: click points, auto-trace lines, adjust image, calibrate axes (Cartesian, log, polar)

Extract numerical data from any chart, plot, or graph image — no more eyeballing values off a screenshot.

Demonstration of usage can be found at: https://youtu.be/zNYWioXi98w

Load an image (anything imread can handle), specify calibration points, and get real numbers back in MATLAB. Works on scanned, photographed, or screenshotted charts — including axes that are LOG, SEMILOG, tilted, skewed, mirrored, reversed, or polar (skew/tilt correction based on the approach used in grabit).

New: semi-automated tracing. Place a few points on a curve and let Digitizer follow the line outward on its own, instead of clicking every point by hand. An Enhance Colored Lines mode helps it pick out faint or pastel-colored lines too.

New: built-in image adjustment. Brightness, contrast, auto-contrast, grayscale, invert, flip, and rotate — clean up a low-quality source image without leaving the app.

Also included:

1D and 2D digitization, with resampling to a common X for use with interp1/interp2/interpn (all interp1 methods supported)

Export to structure, text, DataTableLookup, CSV, XLSX, JSON, mat file, or clipboard — output optionally compatible with Simulink lookup table format

Polynomial regression models generated directly in-app; entered points can be smoothed with smoothdata

RGB color readout for any clicked point

Full undo/redo, including Ctrl+Z / Ctrl+Y

Usage:

Load image

Specify calibration points (follow prompts)

Click to place data points, or trace a curve automatically — adjust/delete as needed

Add a second dimension as needed — repeat step 3

Export to file or workspace

If this saves you time, please rate and review!

Created by: Chris Wilkening

Contact: www.linkedin.com/in/chris-wilkening-8a3769123