Axis Ab

Toivo Henningsson

Song Yuan

Viktor Edpalm

Björn Ardö

Johan Förberg

Johan Nyström

Johan Palmaeus

Tor Nilsson

A and method encode a view area within a current image frame of a video into an encoded video area frame. The view area is a respective subarea of each image frame, each image frame comprising first and second image portions, and between previous and current image frames, the view area moves across a boundary between the first and second image portions. First and second encoders are encode image data of the first and second image portions, respectively. First, second and third portions of the view area are identified based on their respective location in the previous and current image frames. Image data of the first and third portions are inter-coded as first and third encoded slices/tiles. Image data of the second portion of the view area in the current image frame are intra-coded as a second encoded slice/tile. The encoded slices/tiles are merged into the encoded video area frame.

Image processing device and a method for encoding a view area within an image frame of a video into an encoded video area frame

An image processing device, a non-transitory computer-readable storage medium and a method for dividing an array of pixels into slices and tiles, and a system for encoding the slices and tiles into a video stream by means of a first encoder arranged in a first image processing circuitry and a second encoder arranged in a second image processing circuitry are disclosed. The array of pixels consists of a first subset of pixels having pixel data stored in a first buffer arranged in the first image processing circuitry and a second subset of pixels having pixel data stored in a second buffer arranged in the second image processing circuitry, wherein a first border between the first subset of pixels and the second subset of pixels is tilted at a tilt angle in relation to the array of pixels. The array of pixels is divided into two or more slices, and each slice is divided into two or more tiles. The two or more tiles of each slice consists of a first subset of tiles and a second subset of tiles, wherein the first subset of tiles and the second subset of tiles are disjunct and the first subset of tiles is to be encoded by the first encoder and the second subset of tiles is to be encoded by the second encoder. Dividing each slice into two or more tiles comprises setting a second border between the first subset of tiles and the second subset of tiles at an offset between two adjacent slices of the two or more slices, wherein the offset is based on the tilt angle.

Method, an image processing device for dividing an array of pixels into slices and tiles, and a system for encoding the slices and tiles into a video stream

A method for image stabilization of a video stream captured by a panable and/or tiltable video camera the method comprising: generating a motor position signal, Y, of a pan/tilt motor of the video camera; generating a gyro signal, Y, of a gyroscopic sensor of the video camera; generating a reference signal from a predetermined movement curve of the pan/tilt motor of the video camera, the reference signal is a reference on how a pan/tilt operation of the video camera is made without shaking of the video camera; from the motor position signal, Y, and the gyro signal, Y, generating a combined signal, Y, according to: Y=F*Y+F*Y, wherein Fis a low pass filter and Fis a high pass filter; and performing image stabilization on the video stream based on a difference between the combined signal, Y, and the reference signal.

Image stabilization of a video stream captured by a panable and/or tiltable video camera

The present invention relates to the field of image encoding. In particular, it relates to methods and devices where the concept of auxiliary frames may be employed to reduce or remove the need of copying data, for reference encoding purposes, between encoders which encode different parts of an image frame. This purpose is achieved by spatially modifying (S) original image data before encoding (S, S) it using the encoders, and using (S) the encoded image data as image data of an auxiliary frame. The auxiliary frame is referenced by an inter frame comprising motion vectors corresponding to a restoration of the auxiliary frame image data back to a spatial arrangement of the original image data.

Methods and devices for encoding a video stream using a first and a second encoder

There is provided a method performed in a multi-sensor video camera having a first and a second sensor with partly overlapping fields of view. A first and a second received video frame being simultaneously captured each has a non-overlapping portion and an overlapping portion. A frame of a first video stream is generated by joining together image data from the non-overlapping portions of the first and the second video frame with image data from the overlapping portion of the first video frame only, and a frame of a second video stream is generated to include image data from the overlapping portion of at least the second video frame. The frame of the first video stream and the frame of the second video stream are processed in parallel, wherein the processing of the frame of the second video stream includes preparing an overlay based on the image data from the overlapping portion of at least the second video frame. The overlay is added to the processed frame of the first video stream at a portion thereof corresponding to the overlapping portion of the first video frame. Image data from the overlapping portion of the first video frame is blended with image data from the overlapping portion of the second video frame in at least one of the steps of preparing the overlay and adding the overlay.

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Lund, Sweden

Toivo Henningsson