Method for determining color using CMOS image sensor
View Patent ↗A method is provided for determining a color using a CMOS image sensor. The CMOS image sensor includes an n-type substrate and a p-type epitaxy layer overlying the n-type substrate. The method includes applying a first voltage on the n-type substrate and obtaining a first output, which is associated with the first voltage. The method further includes applying a second voltage on the n-type substrate and obtaining a second output, which is associated with the second voltage. The method additionally includes applying a third voltage on the n-type substrate and obtaining a third output, which is associated with the third voltage. The method also includes providing a plurality of weighting factors and determining the color based on the plurality of weighting factors, the first output, the second output, and the third output.
1. A method for determining a color using a CMOS image sensor, wherein the CMOS image sensor includes an n-type silicon substrate and a p-type epitaxy layer, the p-type epitaxy layer overlaying the n-type substrate, the method comprising:
applying a first voltage on the n-type substrate;
obtaining a first output, the first output being associated with the first voltage;
applying a second voltage on the n-type substrate;
obtaining a second output, the second output being associated with the second voltage;
applying a third voltage on the n-type substrate;
obtaining a third output, the third output being associated with the third voltage;
providing a plurality of weighting factors; and
determining the color based on the plurality of weighting factors, the first output, the second output, and the third output.
2. The method of claim 1 , wherein the first output is associated with a first color.
3. The method of claim 2 wherein the first color is a blue color.
4. The method of claim 1 , wherein the plurality of weighting factors includes:
a first weighting factor, the first weighting factor being associated with a blue color;
a second weighting factor, the second weighting factor being associated with a green color; and
a third weighting factor, the third weighting factor being associated with a red color.
5. The method of claim 1 , wherein the color comprises:
a first component;
a second component; and
a third component.
6. The method of claim 5 , wherein the determining the color comprises:
determining the first component based on the first output;
determining the second component based on the second output and the first component; and
determining the third component based on the third output, the first component, and the second component.
7. The method of claim 5 , wherein:
the first component is a blue color component;
the second component is a green color component; and
the third component is a red color component.
8. The method of claim 1 , wherein:
the first voltage is higher than the second voltage;
the second voltage is higher than the third voltage.
9. The method of claim 8 , wherein the third voltage is zero volt.
10. The method of claim 1 , wherein:
the first output is associated with a blue color;
the second output is associated with the blue color and a green color; and
the third output is associated with the blue color, the green color, and a red color.