Dispenser

1. A dispenser comprising a frame suitable for receiving a replaceable filling, wherein the frame comprises a dispensing mechanism for the purpose, when the filling is fitted in the frame, of dispensing a predetermined quantity of the filling outside the frame, characterized in that the dispenser further comprises a camera, a processor and a memory, wherein the camera is placed in the frame such that, when the filling is fitted in the frame, the camera is suitable for forming an image of at least a portion of the filling, wherein at least one predetermined reference image is stored in the memory, and wherein the processor is connected operationally to the camera, the memory and the dispensing mechanism and is provided for the purpose of determining a similarity between said image and said reference image, wherein said similarity is determined over multiple dispensing steps, and wherein the processor is further provided for the purpose of stopping the dispensing mechanism when said similarity lies below a predetermined value,

wherein the similarity is calculated by:

defining the similarity at a predetermined initial value when a filling is placed;

subtracting a first predetermined value from the predetermined initial value when the image differs from the reference image during dispensing of a predetermined quantity of the filling; and

adding a second predetermined value to the predetermined initial value when the image corresponds to the reference image during dispensing of a predetermined quantity of the filling.

2. The dispenser as claimed in claim 1 , wherein the camera is placed in the frame at a distance of at least 1.0 centimeter from said portion of the filling when the filling is fitted in the frame.

3. The dispenser as claimed in claim 1 , wherein a light source is provided in the frame for illuminating said portion of the filling when the filling is fitted in the frame.

4. The dispenser as claimed in claim 1 , wherein at least said portion of the filling makes a movement in the frame when the dispensing mechanism dispenses the predetermined quantity of the filling.

5. The dispenser as claimed in claim 4 , wherein the camera is a line camera which is provided for the purpose of forming an image during said movement.

6. The dispenser as claimed in claim 1 , wherein the dispensing mechanism comprises an operating element for the purpose of starting said dispensing of a predetermined quantity of said filling.

7. The dispenser as claimed in claim 6 , wherein the operating element comprises an electronic circuit for controlling the dispensing mechanism.

8. The dispenser as claimed in claim 7 , wherein the processor is connected operationally to the electronic circuit for the purpose of stopping the dispensing mechanism.

9. The dispenser as claimed in claim 1 , wherein the dispenser comprises a blocking element and wherein the processor is provided for the purpose of stopping the dispensing mechanism by controlling the blocking element.

10. The dispenser as claimed in claim 1 , wherein the dispenser is a roll dispenser wherein the dispensing mechanism is formed as an unrolling mechanism for unrolling a filling roll in order to dispense a predetermined quantity of sheet-like material from the filling roll to the outside.

11. The dispenser as claimed in claim 10 , wherein the camera is directed at the sheet-like material when a filling roll is fitted in the frame.

12. The dispenser as claimed in claim 1 , wherein the dispenser is a liquid dispenser wherein the frame is adapted to comprise a liquid container, wherein the camera is directed at the liquid container.