class BaslerRoiIntensity (ImageMeasurement):
    def __init__(self, x,y,w,h):
        ImageMeasurement.__init__(self, image2,  "roi"+ str([x,y,w,h]))
        self.x, self.y, self.w, self.h, =  x,y,w,h
    def calc(self, data):
        return data.getRoi(Rectangle(self.x, self.y, self.w, self.h)).integrate(False)
       
class Profile(ReadableArray):
    def read(self):
        return image2.data.integrateHorizontally(False)        
    def getSize(self):
        return image2.data.getWidth() 
        
def before_read(pos, scan):
    cam2.start();
    image2.waitNext(3000)

EXPOSITION = [0.001, 0.002, 0.005, 0.01 , 0.025, 0.05, 0.1, 0.25, 0.5, 1.0]
def before_pass(pass_id, scan):
    #exposure = (0.005) * (pass_ids)
    exposure = EXPOSITION[pass_id-1]
    while cam2.exposure != exposure:
        cam2.setExposure(exposure)
        time.sleep(0.5)
    print "Exposure = ", exposure

set_device_alias(image2.intensity, "Intensity")    
p=Profile()
set_device_alias(p, "Profile_1d")   
sensors = [image2.intensity, Profile(),p,BaslerRoiIntensity(10,10,20,20)]    
tscan(sensors, 10, 1.0, passes = 10, \
    before_read=before_read, before_pass=before_pass, \ 
    save=False, line_plots=[p])