function init(self)
    local logosize = 128
    local screen_width = sys.get_config("display.width", 600)
    local screen_height = sys.get_config("display.height", 800)
    local scale_width = screen_width / logosize
    local scale_height = screen_height / logosize
    
    go.set("#sprite", "scale", vmath.vector3(scale_width, scale_height, 1) )
    
    if camera ~= nil then

        local sysinfo = sys.get_sys_info()
        
        local quality = camera.CAPTURE_QUALITY_HIGH
        local type = camera.CAMERA_TYPE_FRONT
        if sysinfo.system_name == 'iPhone OS' then
            type = camera.CAMERA_TYPE_BACK
            quality = camera.CAPTURE_QUALITY_MEDIUM
        end
        
        if camera.start_capture(type, quality) then
	        self.cameraframe = camera.get_frame()
	        self.camerainfo = camera.get_info()
	        print("Initialized camera")
	        pprint(self.camerainfo)    
	        
	        self.cameratextureheader = {width=self.camerainfo.width,
	                                    height=self.camerainfo.height,
	                                    type=resource.TEXTURE_TYPE_2D,
	                                    format=resource.TEXTURE_FORMAT_RGB,
	                                    num_mip_maps=1 }
        end
    else
        print("could not start camera capture")
    end
    
    if qrcode == nil then
        print("could not find qrcode module")
    end
end

function final(self)
    if self.cameraframe ~= nil then
        camera.stop_capture()
    end
end


function update(self, dt)
    if self.cameraframe then
        local pathmodelcamera = go.get("#sprite", "texture0")
        resource.set_texture(pathmodelcamera, self.cameratextureheader, self.cameraframe)
        
        local url = qrcode.scan(self.cameraframe, self.camerainfo.width, self.camerainfo.height)
        
        if url ~= nil then
        	label.set_text("logo#qrcode", url)
        else
        	label.set_text("logo#qrcode", "...")
        end
    end
    
    
end