Image Signal Processor Dynamic Pedestal Level Regulation
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Solution Overview
Problem
Electronic devices face issues with noise signal clipping during image signal processing, leading to artifacts in displayed images, as existing technologies fail to dynamically regulate the pedestal level effectively.
Innovation Solution
An image signal processor that generates a display signal by determining a second pedestal level based on the first pedestal level and processing gain, amplifying the signal, removing noise, and subtracting the pedestal level to prevent clipping, thereby minimizing image artifacts.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If noise signal removal is performed on amplified image signal, then image quality is improved, but noise signal may be clipped causing artifacts
Solution Approach 1:
The patent applies preliminary action by adjusting the pedestal level before noise signal removal. The processor dynamically regulates the pedestal level of the amplified image signal to ensure that noise signals remain within the representable range during processing. This prevents clipping artifacts from occurring in the first place, allowing effective noise removal while maintaining image quality.
Solution Approach 2:
The patent employs parameter changes by dynamically adjusting the pedestal level parameter based on the processing gain and bit width. The processor calculates an appropriate pedestal level that prevents noise signal clipping while maintaining image quality. This dynamic parameter adjustment allows the system to adapt to different processing conditions and prevent artifacts.
2Power
If processing gain is increased to amplify image signal, then signal strength is improved, but noise signal range increases causing clipping
Solution Approach 1:
The patent applies parameter changes by dynamically adjusting the pedestal level parameter in response to processing gain changes. When processing gain is increased to amplify the image signal, the processor simultaneously adjusts the pedestal level to accommodate the expanded signal range. This prevents noise signals from being clipped while maintaining the benefits of signal amplification.
Solution Approach 2:
The patent implements feedback by continuously monitoring the relationship between processing gain and pedestal level. The processor uses the processing gain value to determine the appropriate pedestal level adjustment, creating a feedback mechanism that ensures noise signals remain within the representable range even as signal strength increases.
3Reliability
If pedestal level is dynamically adjusted, then clipping is prevented, but processing complexity increases
Solution Approach 1:
The patent manages processing complexity through systematic parameter changes. The processor calculates the pedestal level using a defined relationship with processing gain and bit width, transforming a complex dynamic adjustment problem into a manageable calculation based on existing processing parameters. This approach maintains reliability while controlling complexity.
Data Source
AI summary
An image signal processor that generates a display signal receives an input image signal having a first pedestal level from an image sensor, generates a first signal from the input image signal, the first signal including a second pedestal level, the second pedestal level being different from the first pedestal level and being determined in accordance with the first pedestal level and a processing gain of the image signal processor, generates a second signal having the second pedestal level by amplifying the first signal in accordance with the processing gain, generates a third signal having the second pedestal level by removing a noise signal from the second signal; and generates a fourth signal by subtracting the second pedestal level from the third signal.