Online hand-written chemical symbol identification method based on Hidden Markov model
A chemical symbol and recognition method technology, applied in character and pattern recognition, computer components, instruments, etc., can solve problems such as large-scale chemical symbol collection, deformation of handwritten samples, and uneven quality of strokes, so as to avoid interference and reduce Performance consumption, the effect of accurate identification
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[0057] The specific implementation process is as follows:
[0058] Step 1: Collect chemical symbol samples and preprocess them
[0059] Organize 20 users to use HP Tablet PC for sample collection. This work was carried out using the collection software HCSC under the Windows Vista operating system, and a total of 12444 valid symbol samples were collected. Taking the 102 complete symbols written by each user as a set, the longest writing time is 22 minutes, the shortest writing time is 6 minutes, and the average writing time is 11 minutes; the average writing time of a single sample is 2.58 seconds, of which 1.753 seconds for writing, Pen 1.85 seconds.
[0060] The five-step preprocessing operations of deduplication, interpolation, detection of sharp points, dehooking, and smoothing are performed on the samples in sequence. The hook structure generally occurs when starting or writing, with small length and large angle change, which has a serious impact on the recognition accu...
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