Stereoscopic display apparatus

1. A method of computing a display value to be provided to a stereoscopic display apparatus comprising means for producing a display, the stereoscopic display apparatus comprising laterally separated picture elements in a first plane and optical directory means comprising a group of optical directory elements each of which is associated with a respective group of picture elements, the optical directory means overlying the picture elements in the first plane for directing the outputs of the picture elements in mutually different angular directions relative to the first plane, the method comprising:

determining a first intermediate value from a 3-D representation on basis of a first one of the angular directions and coordinates of a first one of the picture elements;

determining a second intermediate value from the 3-D representation on basis of a further angular direction relative to the first plane and the coordinates of the first one of the picture elements; and

combining the first intermediate value and the second intermediate value to the display value, the display value related to the particular output of the first one of the picture elements;

wherein the further angular direction corresponds to a second one of the angular directions, the first one of the angular directions determined by a first spatial position of the first one of the picture elements relative to its associated first one of the optical directory elements, the second one of the angular directions determined by a second spatial position of a second one of the picture elements relative to its associated second one of the optical directory elements.

2. A method as claimed in claim 1 , wherein a first difference between the first one of the angular directions and the further angular direction is substantially equal to a second difference between the first one of the angular directions and a second one of the angular directions.

3. A method as claimed in claim 2 , wherein the second difference corresponds to the minimum of mutual differences of the set of mutual differences between the angular directions.

4. A method as claimed in claim 1 , wherein for determining the first intermediate value the first one of the angular directions is applied.

5. A method of computing a display value to be provided to a stereoscopic display apparatus comprising means for producing a display, the stereoscopic display apparatus comprising laterally separated picture elements in a first plane and optical directory means comprising a group of optical directory elements each of which is associated with a respective group of picture elements, the optical directory means overlying the picture elements in the first plane for directing the outputs of the picture elements in mutually different angular directions relative to the first plane, the method comprising:

determining a first intermediate value from a 3-D representation on basis of a first one of the angular directions and coordinates of a first one of the picture elements;

determining a second intermediate value from the 3-D representation on basis of a further angular direction relative to the first plane and the coordinates of the first one of the picture elements; and

combining the first intermediate value and the second intermediate value to the display value, the display value related to the particular output of the first one of the picture elements;

determining a third intermediate value from the 3-D representation on basis of a second further angular direction relative to the first plane and the coordinates of the first one of the picture elements; and

combining the first intermediate value, the second intermediate value and the third intermediate value to the display value.

6. A method as claimed in claim 5 , wherein combining comprises computing an average of the first intermediate value the second intermediate value and optionally the third intermediate value to compute the display value.

7. A method as claimed in claim 6 , wherein computing the average comprises computing a weighted average.

8. A stereoscopic display apparatus comprising means for producing a display, the stereoscopic display apparatus comprising laterally separated picture elements in a first plane and optical directory means comprising a group of optical directory elements each of which is associated with a respective group of picture elements, the optical directory means overlying the picture elements in the first plane for directing the outputs of the picture elements in mutually different angular directions relative to the first plane, the display apparatus further comprising:

first determining means for determining a first intermediate value from a 3-D representation on basis of a first one of the angular directions and coordinates of a first one of the picture elements;

second determining means for determining a second intermediate value from the 3-D representation on basis of a further angular direction relative to the first plane and the coordinates of the first one of the picture elements;

third determining means for determining a third intermediate value from the 3-D representation on basis of a second further angular direction relative to the first plane and the coordinates of the first one of the picture elements;

combining means for combining the first intermediate value, the second intermediate value and the third intermediate value to a display value; and

providing means for providing the display value to the first one of the picture elements to generate its output.

9. A computer program product, stored in a non-transitory computer readable medium, to be loaded by a computer arrangement, comprising instructions to compute a display value to be provided to a stereoscopic display apparatus comprising means for producing a display, the stereoscopic display apparatus comprising laterally separated picture elements in a first plane and optical directory means comprising a group of optical directory elements each of which is associated with a respective group of picture elements, the optical directory means overlying the picture elements in the first plane for directing the outputs of the picture elements in mutually different angular directions relative to the first plane, the computer arrangement comprising processing means and a memory, the computer program product, after being loaded, providing said processing means with the capability to carry out:

determining a first intermediate value from a 3-D representation on basis of a first one of the angular directions and coordinates of a first one of the picture elements;

determining a second intermediate value from the 3-D representation on basis of a further angular direction relative to the first plane and the coordinates of the first one of the picture elements;

determining a third intermediate value from the 3-D representation on basis of a second further angular direction relative to the first plane and the coordinates of the first one of the picture elements;

combining the first intermediate value, the second intermediate value and the third intermediate value to the display value, the display value related to the particular output of the first one of the picture elements.