For offline usage and more functionalities, like automatic point detection, you need to upgrade to the pro version.
It offers a free online app that is efficient enough for data extraction you can check it out here.
Moreover, you can calculate the distance between two points, angle between two lines, and area of an irregular polygon on the image using PlotDigitizer. PlotDigitizer supports several types of graphs: XY, bar, column, pie/doughnut, polar, ternary, & maps. You can extract data from graphs and plots with only a few simple steps using PlotDigitizer. PlotDigitizer is one of the best tools on the internet that eases data extraction from graph images. To extract data from others’ graphs is not a pleasing experience. And most times, they heavily rely on others’ work and research. Individuals from scientific fields often have to deal with plots and charts. This is especially true for people from research and engineering backgrounds. A document could be physical, like a paper or book, or it could be in a digital format, as a PDF. In other words, you want to extract data from graphs and plots from a document. This process of reverse-engineering is called the digitization of data.
However, sometimes people want to extract the raw data from these visuals, i.e., reverse-engineer graphs and plots to retrieve the hidden numerical data. For example, financial stocks are always published on websites in charts. Graphs and plots quickly let us know the trends and information that people want to communicate to us. People have tons of data to share, and they do it by creating intelligible visuals and graphics.
They are used by people from all professions. Graphs, Plots, and Charts are a very powerful way of communicating our research and presenting our data to our audience.
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