Comments on abstract, title, references

The aim of the research is clearly mentioned. Title can be more specific References look relevant

Comments on introduction/background

Adequate literature review is done to to understand the research..

Comments on methodology

The author is clear about the subject selection for carrying out the experiment. Author is appreciated for comparing the classification accuracy for different data sets with different features

Comments on data and results

Tables and figures are clearly presented The results are well presented and statistically justified

Comments on discussion and conclusions

Author well presented the visual words approach to medical image categorization. Conclusion is well supported with relevant references. The work presented can be well taken up for further research