US 2018/0007241 A1 · SCALING OF IMAGE DATA IN SENSOR INTERFACE BASED ON DETECTION OF DEFECTIVE PIXELS

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.

Claims20

Dependent claims

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.

6 more elements

A method of interfacing with an image sensor, comprising:

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.

4 more elements

An image signal processor, comprising:

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.

7 more elements

Dependencies are inferred from the claim text.

Scaling of image data in sensor interface based on detection of defective pixels

Life of this patent

Scaling of image data in sensor interface based on detection of defective pixels

Life of this patent

Abstract

Claims20