IssueID #31 : test app of image subtract
IssueID #31 : separate test app to a new directory
IssueID #31 : separate test app to a new directory
IssueID #31 : test.001 get statistics of hsv image space
IssueID #31 : test.001 make graph
IssueID #31 : test.001 make graph bugfix
IssueID #31 : test.001 make graph bugfix
IssueID #31 : test.002 get area average pix val