Fig. 5

Statistics of the potential stroke recognition issues. This shows the statistical result of the potential stroke recognition issues. Issue (a): This shows that recognition failure may be due to scratchy handwriting. Issue (b): This shows that recognition failure may happen despite of neat handwriting. Issue (c): This shows that users need to write carefully for a high recognition rate which leads a slow input speed. Issue (d): This shows that the limited writing area makes it difficult to write complicated characters