SCALING OF IMAGE DATA IN SENSOR INTERFACE BASED ON DETECTION OF DEFECTIVE PIXELS
First Claim
1. A sensor interface circuit, comprising:
- a register circuit configured to store operating parameters of the sensor interface circuit; and
a scaling circuit comprising;
a first defect pixel detection circuit configured to detect a first defective pixel in an input image by analyzing pixels in a line of an input image data along a first direction; and
a first scaling circuit coupled to the first defect pixel detection circuit, the first scaling circuit configured to generate a scaled line of pixels representing the line of the input image scaled along the first direction according to the operating parameters by;
(i) defining first subsets of pixels in the line of the input image so that the first defective pixel is included in only one of the first subsets of pixels; and
(ii) filtering each of the defined first subsets of pixels through a first multi-tap polyphase filter.
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Abstract
Embodiments of the present disclosure relate to a sensor interface circuit that performs scaling of image data in a Bayer pattern without spreading defective pixels across multiple pixels. The sensor interface circuit may include a register circuit storing operating parameters of the sensor interface circuit. The sensor interface circuit includes a scaling circuit with a first defect pixel detection circuit to detect a first defective pixel in an input image by analyzing pixels in a line of an input image data along a first direction. A first scaling circuit is coupled to the first defect pixel detection circuit and generates a scaled line of pixels representing the line of the input image scaled along the first direction according to the operating parameters.
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Citations
20 Claims
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1. A sensor interface circuit, comprising:
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a register circuit configured to store operating parameters of the sensor interface circuit; and a scaling circuit comprising; a first defect pixel detection circuit configured to detect a first defective pixel in an input image by analyzing pixels in a line of an input image data along a first direction; and a first scaling circuit coupled to the first defect pixel detection circuit, the first scaling circuit configured to generate a scaled line of pixels representing the line of the input image scaled along the first direction according to the operating parameters by; (i) defining first subsets of pixels in the line of the input image so that the first defective pixel is included in only one of the first subsets of pixels; and (ii) filtering each of the defined first subsets of pixels through a first multi-tap polyphase filter. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. A method of interfacing with an image sensor, comprising:
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storing, by a register circuit, operating parameters for configuring operation of a sensor interface circuit; detecting, by a first defect pixel detection circuit of the sensor interface circuit, a first defective pixel in an input image by analyzing pixels in a line of an input image along a first direction; and generating, at a first scaling circuit of the sensor interface circuit, a scaled line of pixels representing the line of input image scaled along the first direction according to the operating parameters, the scaled line of pixels generated by; defining first subsets of pixels in the line of the input image so that the first defective pixel is included in only one of the first subsets of pixels; and filtering each of the defined first subsets of pixels through a first multi-tap polyphase filter. - View Dependent Claims (11, 12, 13, 14, 15, 16)
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17. An image signal processor, comprising:
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a scaling circuit comprising; a first defect pixel detection circuit configured to detect a first defective pixel in an input image by analyzing pixels in a line of an input image along a first direction; a first scaling circuit coupled to the first defect pixel detection circuit, the first scaling circuit configured to generate a scaled line of pixels representing the line of the input image scaled along the first direction by; (i) defining first subsets of pixels in the line of the input image so that the first defective pixel is included in only one of the first subsets of pixels; and (ii) filtering each of the defined first subsets of pixels through a first multi-tap polyphase filter; and a second scaling circuit configured to generate a scaled image by filtering a plurality of lines of pixels scaled in the first direction by the first scaling circuit through a second multi-tap polyphase filter along a second direction perpendicular to the first direction; and a pipeline coupled to the scaling circuit and configured to perform processing on the scaled image. - View Dependent Claims (18, 19, 20)
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Specification