Methodology for generating high fidelity digital zoom for mobile phone cameras

A mobile device comprising:

• an embedded digital camera configured to capture a burst of N images;
• processing circuitry comprising:
• a registration module configured to, for each image within the burst of images:
• analyze an amount of warp of the image and generate a set of affine matrices indicating the amount of warp of the image;
• a High Fidelity (HiFi) Interpolation block configured to, for each image within the burst of images:
• perform affine transformation using the set of affine matrices associated with the image, apply an aliasing-retaining interpolation filter, and implement rotation transformation and sub-pixel shifts, yielding an interpolated image;
• and
• a blending module configured to receive the N interpolated images and blend the N interpolated images into a single-blended image having a user-selected digital zoom ratio.

A system comprising:

• processing circuitry configured to couple to a mobile device comprising an embedded digital camera configured to capture a burst of N images, the processing circuitry comprising:
• a registration module configured to, for each image within the burst of images:
• analyze an amount of warp of the image and generate a set of affine matrices indicating the amount of warp of the image;
• a High Fidelity (HiFi) Interpolation block configured to, for each image within the burst of images:
• perform affine transformation using the set of affine matrices associated with the image, apply an aliasing-retaining interpolation filter, and implement rotation transformation and sub-pixel shifts, yielding an interpolated image;
• and
• a blending module configured to receive the N interpolated images and blend the N interpolated images into a single-blended image having a user-selected digital zoom ratio.