Image processing system and method for an image sensor
First Claim
1. An image processing system for an image sensor, comprising:
- a pixel array that provides pixel signals, the pixel array including active pixels sensors (APSs), compensating optical black pixels (OBPs) and estimating OBPs;
an analog-to-digital conversion (ADC) unit that performs analog-to-digital conversion on the pixel signals, thereby generating digital pixel signals;
a correlated double sampling (CDS) unit that performs correlated double sampling on the digital pixel signals;
a black level estimation (BLE) unit that generates a negative offset voltage according to dark voltage obtained from correlated double sampling performed on the estimating OBPs, the negative offset voltage being subtracted from the pixel signals before feeding the pixel signals to the ADC unit; and
a black level compensation (BLC) unit that performs black level compensation on the APSs and the compensating OBPs.
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Abstract
An image processing system for an image sensor includes an analog-to-digital conversion (ADC) unit that performs ADC on pixel signals, thereby generating digital pixel signals; a correlated double sampling (CDS) unit that performs CDS on the digital pixel signals; a black level estimation (BLE) unit that generates a negative offset voltage according to dark voltage obtained from CDS performed on estimating optical black pixels (OBPs) of a pixel array, the negative offset voltage being subtracted from the pixel signals before feeding the pixel signals to the ADC unit; and a black level compensation (BLC) unit that performs BLC on active pixels sensors (APSs) and the compensating OBPs of the pixel array.
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Citations
20 Claims
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1. An image processing system for an image sensor, comprising:
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a pixel array that provides pixel signals, the pixel array including active pixels sensors (APSs), compensating optical black pixels (OBPs) and estimating OBPs; an analog-to-digital conversion (ADC) unit that performs analog-to-digital conversion on the pixel signals, thereby generating digital pixel signals; a correlated double sampling (CDS) unit that performs correlated double sampling on the digital pixel signals; a black level estimation (BLE) unit that generates a negative offset voltage according to dark voltage obtained from correlated double sampling performed on the estimating OBPs, the negative offset voltage being subtracted from the pixel signals before feeding the pixel signals to the ADC unit; and a black level compensation (BLC) unit that performs black level compensation on the APSs and the compensating OBPs. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13)
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14. An image processing system for an image sensor, comprising:
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a pixel array that provides pixel signals, the pixel array including active pixels sensors (APSs), compensating optical black pixels (OBPs) and estimating OBPs; a correlated double sampling (CDS) unit that performs correlated double sampling on the pixel signals; a black level estimation (BLE) unit that generates a negative offset voltage according to dark voltage obtained from correlated double sampling performed on the estimating OBPs, the negative offset voltage being subtracted from the pixel signals before subjecting the pixel signals to correlated double sampling; and a black level compensation (BLC) unit that performs black level compensation on the APSs and the compensating OBPs. - View Dependent Claims (15, 16, 17)
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18. An image processing method for an image sensor, comprising:
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providing pixel signals by a pixel array, the pixel array including active pixels sensors (APSs), compensating optical black pixels (OBPs) and estimating OBPs; performing analog-to-digital conversion (ADC) on the pixel signals, thereby generating digital pixel signals; performing correlated double sampling (CDS) on the digital pixel signals; performing black level estimation (BLE) to generate a negative offset voltage according to dark voltage obtained from correlated double sampling performed on the estimating OBPs, the negative offset voltage being subtracted from the pixel signals before subjecting the pixel signals to ADC; and performing black level compensation (BLC) on the APSs and the compensating OBPs. - View Dependent Claims (19, 20)
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Specification