US 8,947,551 B2 · Method and apparatus for frame rotation in the JPEG compressed domain

Abstract

An imaging system may include an image sensor array and circuitry that rotates and encodes images from the image sensor array. The circuitry may encode images from the image sensor into an image format such as a Joint Photographic Experts Group (JPEG) format. The circuitry may perform rotations of the images during encoding into Joint Photographic Experts Group (JPEG) format. Image rotations during encoding and compression may include redefining minimum coded units of the encoded image such that minimum coded units of a rotated image are processed in the same order as minimum coded units in a non-rotated image. Redefinition of minimum coded units may include rewriting of parameters in a start of frame segment of an image data stream such that the height and width of minimum coded units are reversed during rotation.

Claims20

Dependent claims

A method of producing rotated compressed images using an electronic device having an image sensor array and image processing and data formatting circuitry, comprising:

with the image sensor array, capturing an image;
with the image processing and data formatting circuitry, performing preprocessing operations on the image to produce horizontal minimum coded units having luminance and chrominance pixel blocks;
with the image processing and data formatting circuitry, forming a data stream having a start of frame segment and the luminance and chrominance pixel blocks;
and
with the image processing and data formatting circuitry, overwriting parameters in the start of frame segment thereby changing the horizontal minimum coded units into vertical minimum coded units.

2 more elements

A method of producing rotated compressed images using an electronic device having an image sensor array and image processing and data formatting circuitry, comprising:

with the image sensor array, capturing an image;
with the image processing and data formatting circuitry, performing preprocessing operations on the image to produce horizontal minimum coded units of image data having luminance and chrominance pixel blocks;
and
with the image processing and data formatting circuitry, storing a zeroth order coefficient associated with a discrete cosine transform of only a first half of the rotated luminance pixel blocks and discarding coefficients associated with a discrete cosine transform of a second half of the rotated luminance pixel blocks.

1 more element

Dependencies are inferred from the claim text.

Method and apparatus for frame rotation in the JPEG compressed domain

Life of this patent

Method and apparatus for frame rotation in the JPEG compressed domain

Life of this patent

Abstract

Claims20