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US 2004/0201758 A1Published application
Defective pixel correction device
AssigneeMega Chips Corporation
InventorGen Sasaki
Life of this patent
Estimating the term…
Abstract
First pixel data of a pixel of interest is output from a first shift register, while second and third pixel data of neighboring pixels indicative of the same color are output from second and third shift registers, respectively. Differential data between estimated pixel data calculated from the second and third pixel data and the first pixel data is input to a comparator. A threshold value stored in a register is modulated by the estimated pixel data, and is input to the comparator as modulated threshold data. When the comparator judges that the differential data is greater than the modulated threshold data, a selector outputs the estimated pixel data as corrected pixel data.
Claims14
A defective pixel correction device comprising:
- a circuit for receiving image data from a sensor;
- a circuit for obtaining an estimated pixel value of a pixel of interest from pixel data of neighboring pixels of said pixel of interest;
- a circuit for obtaining a differential value between a sensor-input pixel value of said pixel of interest and said estimated pixel value;
- a modulation circuit for modulating a predetermined threshold value by said estimated pixel value, thereby obtaining a modulated threshold value;
- and
- a circuit for comparing said differential value and said modulated threshold value, and when said differential value is greater than said modulated threshold value, outputting said estimated pixel value as a pixel value of said pixel of interest instead of said sensor-input pixel value.
3 more elements
A defective pixel correction device comprising:
- a circuit for receiving pixel data from a color sensor;
- a circuit for obtaining an estimated pixel value of a pixel of interest from pixel data of neighboring pixels of said pixel of interest indicative of the same color as said pixel of interest;
- a circuit for obtaining a differential value between a sensor-input pixel value of said pixel of interest and said estimated pixel value;
- a circuit for storing a threshold value corresponding to each color of said color sensor;
- and
- a comparing and selecting circuit for comparing said differential value and said threshold value corresponding to the color of said pixel of interest, and when said differential value is greater than said threshold value, outputting said estimated pixel value as a pixel value of said pixel of interest instead of said sensor-input pixel value.
3 more elements
A defective pixel correction device comprising:
- a circuit for receiving pixel data from a sensor;
- a circuit for setting an estimated pixel value of a pixel of interest at a pixel value of a pixel indicative of the same color as said pixel of interest, located directly adjacent to said pixel of interest and already undergone defect correction;
- a circuit for obtaining a differential value between a sensor-input pixel value of said pixel of interest and said estimated pixel value;
- a circuit for modulating a threshold value by said estimated pixel value, thereby obtaining a modulated threshold value;
- and
- a circuit for comparing said differential value and said modulated threshold value, and when said differential value is greater than said modulated threshold value, outputting said estimated pixel value as a pixel value of said pixel of interest instead of said sensor-input pixel value.
3 more elements
A defective pixel correction device comprising:
- a circuit for receiving pixel data from a sensor;
- a circuit for obtaining an estimated pixel value of a pixel of interest from pixel data of neighboring pixels of said pixel of interest;
- a circuit for obtaining a differential value between a sensor-input pixel value of said pixel of interest and said estimated pixel value;
- a modulation circuit for modulating said differential value by said estimated pixel value, thereby obtaining a modulated differential value;
- and
- a circuit for comparing said modulated differential value and a predetermined threshold value, and when said modulated differential value is greater than said threshold value, outputting said estimated pixel value as a pixel value of said pixel of interest instead of said sensor-input pixel value.
3 more elements
A defective pixel correction device comprising:
- a circuit for receiving pixel data from a sensor;
- a circuit for setting an estimated pixel value of a pixel of interest at a pixel value of a pixel indicative of the same color as said pixel of interest, located directly adjacent to said pixel of interest, already undergone defect correction;
- a circuit for obtaining a differential value between a sensor-input pixel value of said pixel of interest and said estimated pixel value;
- a circuit for modulating a differential value by said estimated pixel value, thereby obtaining a modulated differential value;
- and
- a circuit for comparing said modulated differential value and a predetermined threshold value, and when said modulated differential value is greater than said threshold value, outputting said estimated pixel value as a pixel value of said pixel of interest instead of said sensor-input pixel value.
3 more elements
Dependencies are inferred from the claim text.