Partial lens shading compensation method
AssigneeNovatek Microelectronics Corp.
InventorWei HSU
Life of this patent
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Abstract
Method and apparatus for partial lens shading compensation are provided. An image area is divided, from the inside towards the outside of the image area, into several partial areas centered on an optical center of the image. When a target pixel is identified as being located in one of the partial areas, a corresponding compensation gain is determined according to the position of the target pixel with reference to the optical center. Another compensation gain is determined according to the position of the target pixel with reference to the optical center. A mixed compensation value is determined according to the compensation gains, so as to compensate the target pixel.
Claims22
A partial lens shading compensation method, comprising:
- dividing, from the inside towards the outside of an image area, the image area into a plurality of partial areas, the partial areas being centered on an optical center of the image area, the partial areas including a first partial area, a second partial area, and a third partial area;
- determining, when a target pixel is identified as being located in the first partial area, a first compensation gain according to the position of the target pixel with reference to the optical center;
- determining, when the target pixel is identified as being located in the second partial area, a second compensation gain according to the position of the target pixel with reference to the optical center;
- determining, when the target pixel is identified as being located in the third partial area, a third compensation gain according to the position of the target pixel with reference to the optical center;
- determining a fourth compensation gain according to the position of the target pixel with reference to the optical center;
- and
- determining a mixed compensation value according to the first compensation gain, the second compensation gain, the third compensation gain, and the fourth compensation gain, so as to compensate the target pixel.
A partial lens shading compensation method, comprising:
- (i) dividing, from the inside towards the outside of an image area, the image area into a plurality of partial areas, the partial areas being centered on an optical center of the image area;
- (ii) identifying, for each of the partial areas, a target pixel as being located inside or outside of that partial area, and determining, according to the identification result, a corresponding compensation gain of that partial area for the target pixel from the position of the target pixel with reference to the optical center;
- (iii) determining another compensation gain for the target pixel according to the position of the target pixel with reference to the optical center;
- and
- (iv) determining a mixed compensation value according to the compensation gains obtained in step (ii) and the another compensation gain obtained in step (iii), so as to compensate the target pixel.
Dependencies are inferred from the claim text.