Invisible Facial Flushing in Two Cases of Dengue Infection and Influenza Detected by PC Program and Smartphone App: Decorrelation Stretching and K-Means Clustering

<div>Four steps of the Manote and Matinun (M&amp;M) technique for the 2<sup>nd</sup> patient. (a) The original photograph by the smartphone camera app showed invisible facial flushing seen by the naked eye. (b) The 1<sup>st</sup> decorrelation stretching picture using the YUV color space. (c) The K-means clustering picture choosing the red cluster. (d) The 2<sup>nd</sup> decorrelation stretching picture using the Lab color space.</div>

Case Reports in Infectious Diseases

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Figure 2: Invisible Facial Flushing in Two Cases of Dengue Infection and Influenza Detected by PC Program and Smartphone App: Decorrelation Stretching and K-Means Clustering 

Figure 2 | Invisible Facial Flushing in Two Cases of Dengue Infection and Influenza Detected by PC Program and Smartphone App: Decorrelation Stretching and K-Means Clustering 