Sigma-delta ADC with integrated raw image scaling filter
A system and method of processing raw image pixel information includes an integrated decimation filter and raw image scaling filter. The decimation filter operates in the time domain; for example, to calculate a weighted average of time samples. The raw image scaling filter operates in the spatial domain; for example, to calculate a weighted average of spatial samples. The raw image pixel information is modulated by a sigma-delta analog-to-digital modulator.
1. A method of processing raw image pixel information, comprising:
applying a decimation filter and a raw image scaling filter, wherein the decimation filter operates in a time domain and the raw image scaling filter operates in a spatial domain, and wherein the decimation filter and the raw image scaling filter are integrated with one another.
2. The method of claim 1 , further comprising: calculating, by the decimation filter, a weighted average of time samples.
3. The method of claim 1 , further comprising: calculating, by the raw image scaling filter, a weighted average of spatial samples.
4. The method of claim 1 , further comprising: capturing, by an image capturing device, the raw image pixel information.
5. The method of claim 4 , wherein the image capturing device is a color image sensor.
6. The method of claim 1 , further comprising:
prior to applying the decimation filter and the raw image scaling filter, converting, by a sigma-delta analog-to-digital modulator, the raw image pixel information.
7. The method of claim 1 wherein the raw image pixel information includes sigma-delta modulated pixel values.
8. An image processing circuit, comprising:
a decimation filter and a raw image scaling filter configured to process raw image pixel information, wherein the decimation filter operates in a time domain and the raw image scaling filter operates in a spatial domain, and wherein the decimation filter and the raw image scaling filter are integrated with one another.
9. The image processing circuit according to claim 8 , wherein the decimation filter is further configured to calculate a weighted average of time samples.
10. The image processing circuit according to claim 8 , wherein the raw image scaling filter is configured to calculate a weighted average of spatial samples.
11. The image processing circuit according to claim 8 , wherein the raw image pixel information is information captured from an image capturing device.
12. The image processing circuit according to claim 11 , wherein the image capturing device is a color image sensor.
13. The image processing circuit according to claim 8 , further comprising a sigma-delta analog-to-digital modulator configured to modulate the raw image pixel information.
14. The image processing circuit according to claim 8 , wherein the raw image pixel information includes sigma-delta modulated pixel values.
15. An imaging device, comprising:
an image capturing device including a pixel array; and
a sigma-delta analog-to-digital converter including a decimation filter and a raw image scaling filter configured to process raw image pixel information, wherein the decimation filter operates in a time domain and the raw image scaling filter operates in a spatial domain, and wherein the decimation filter and the raw image scaling filter are integrated with one another.
16. The imaging device according to claim 15 , wherein the decimation filter is further configured to calculate a weighted average of time samples.
17. The imaging device according to claim 15 , wherein the raw image scaling filter is configured to calculate a weighted average of spatial samples.
18. The imaging device according to claim 15 , wherein the image capturing device is a color image sensor.