Chart data extraction guides
Methods, tool comparisons, and worked examples for extracting chart data and exporting clean CSV or Excel.
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6 min readSpecialized Chart-Understanding Models: ChartOCR, DePlot, PlotQA, MatCha
The chart-extraction ML research literature in one post. What ChartOCR, DePlot, PlotQA, and MatCha actually do, how they perform on real charts, and why none of them are end-user products.
4 min readLearn Chart Digitization: 5 Free Practice Datasets
Five hand-built practice charts with known ground-truth values, ordered by difficulty. Every chart includes an answer key so you can grade your own accuracy and improve deliberately.
4 min readWorkshop: Dense Scatter Plot with Auto-Extract
Extract 250 points from a three-cluster scatter plot in 90 seconds using color-based auto-extraction. The workflow that turns an hour of clicking into a coffee-break job.
4 min readWorkshop: Log-Scale Chart Without Arithmetic Mistakes
Extract 12 data points from a semi-log decay curve spanning two orders of magnitude. The chart type AI extraction gets reliably wrong — and the calibration trick that makes it trivial for a deterministic tool.