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US 8,077,253 B2Granted
Solid-state device having digital signal processing circuit
AssigneeKabushiki Kaisha Toshiba
InventorsJunichi Hosokawa, Yuuki Koguchi, Keizo Tashiro, Teppei Nakano
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Abstract
An analog signal photo-electrically converted in a pixel of a light receiving area is converted to a digital signal by an ADC. The digital signal is processed by a digital signal processing circuit, and then, successively output as a digital video signal. The digital signal processing circuit has a first signal processing block for detecting and correcting a pixel defect and preventing a noise, and a second signal processing block for restoring apparent resolution lost by the processing by the first signal processing block.
Claims16
A solid-state imaging device comprising:
- a light receiving area configured to include a plurality of different-color pixels each performing photoelectric conversion;
- an analog-to-digital conversion circuit configured to convert a photo-electrically converted analog signal in each pixel of the light receiving area to a digital signal;
- and a digital signal processing circuit configured to receive the digital signal output from the analog-to-digital conversion circuit, and configured to perform a digital processing with respect to the received digital signal, and configured to output a digital-processed signal, the digital signal processing circuit including:
- a first signal processing block configured to perform a first processing for preventing a noise component included in a digital signal of a pixel positioning on the center of several pixels included in a desired area of the light receiving area;
- and
- a second signal processing block configured to perform a second processing for extracting a high-frequency component existing in a digital signal of a pixel positioning on the center of several pixels included in a desired area of the light receiving area to restore apparent resolution;
- wherein the digital signal processing circuit further including:
- a line memory included in either of the first and second signal processing blocks, the line memory configured to output a plurality of horizontal line signals in the light receiving area;
- wherein the second signal processing block including:
- a shift register configured to receive an output of the line memory, and configured to output a plurality of pixel digital signals positioning at a periphery of the pixel positioning on the center restoring the apparent resolution and having color different from the pixel positioning on the center;
- and
- a spatial band-pass filter configured to receive an output of the shift register, and configured to include a fixed spatial coefficient for extracting a high-frequency component existing in a digital signal of the pixel positioning on the center.
9 more elements
A solid-state imaging device comprising:
- a light receiving area configured to include a plurality of different-color pixels each performing photoelectric conversion;
- an analog-to-digital conversion circuit configured to convert a photo-electrically converted analog signal in each pixel of the light receiving area to a digital signal;
- and
- a digital signal processing circuit configured to receive the digital signal output from the analog-to-digital conversion circuit, and configured to perform a digital processing with respect to the received digital signal, and configured to output a digital-processed signal, the digital signal processing circuit including:
- a first signal processing block configured to perform a first processing for detecting and correcting a signal defect of a pixel positioning on the center of several pixels included in a desired area of the light receiving area, and configured to perform a second processing for preventing a noise component of a digital signal of the pixel positioning on the center;
- and
- a second signal processing block configured to perform a third processing for receiving an output from the first signal processing block, and configured to extract a high-frequency component existing in a digital signal of a pixel positioning on the center of a plurality of pixels included in the desired area of the light receiving area;
- wherein the first signal processing block including:
- a first line memory configured to output a plurality of horizontal line signals in the light receiving area;
- and the second signal processing block including:
- a second line memory configured to output a plurality of horizontal line signals having the number different from the first line memory in the light receiving area;
- wherein the second signal processing block further including:
- a shift register configured to receive an output of the second line memory, and configured to output a plurality of same-color pixel digital signals including the pixel positioning on the center and a plurality of pixel digital signals positioning at a periphery of the pixel positioning on the center restoring the apparent resolution and having color different from the pixel positioning on the center;
- and
- a spatial band-pass filter configured to receive a plurality of different-color pixel digital signals output from the shift register, and configured to include a fixed spatial coefficient for extracting a high-frequency component existing in a digital signal of the pixel positioning on the center.
12 more elements
Dependencies are inferred from the claim text.