Zoran Corporation

About: Zoran Corporation is a based out in . It is known for research contribution in the topics: Signal & Pixel. The organization has 241 authors who have published 205 publications receiving 4901 citations.

Image compression coder having improved bit rate control and block allocation.

Abstract: A method of bit rate control and block allocation for discrete cosine transform (DCT) image signal compression includes the steps of (a) partitioning the image signals in blocks (b) calculating DCT coefficients in all blocks, (c) obtaining a measure of block activity (BACT) for each block based on DCT coefficients and for the total image activity (ACT) as a sum of the measures of all block activity, (d) determining a code allocation factor (AF) for each block based on the ratio of block activity (BACT) to target code volume (TCV data) for the coded image date, and (e) allocating bits for each block using the allocation factor (AF) for each block and the target code volume (DCV data). Steps (a-d) are carried out with a first statistical pass through the image data, and step (e) is carried out in a second compression pass through the image data.

2:2 and 3:2 pull-down detection techniques

Abstract: The present disclosure describes improved 2:2 and (310) and 3:2 (410) pull-down detection techniques. The techniques of the present invention can, for example, be used when converting an interlaced video signal into a progressive video signal.

Techniques of modifying image field data by extrapolation

Abstract: Techniques for modifying data of an image that can be implemented in a digital camera, video image capturing device and other optical systems are provided to correct for Image image shading variations appearing in data from a two-dimensional photo-sensor. These variations can be caused by imperfect lenses, non-uniform sensitivity across the photo-sensor, and internal reflections within a housing of the optical system, for example. In order to correct for these variations, a small amount of modification data is stored in a small memory within the camera or other optical system, preferably separate correction data for each primary color. Image data from individual pixels are corrected on the fly by interpolating individual pixel corrections from the stored modification data, at the same rate as the image data is being acquired, so that the correction takes place without slowing down data transfer of picture data from the image sensor.

Video memory management for MPEG video decode and display system

Abstract: A system and method for decoding and displaying a video bitstream representing video images and displaying the video images. The present invention discloses a split memory manager design which is particularly adapted to display MPEG-2 format video images. In addition, the present invention discloses a novel way of managing the video memory used in a video decode and display system. Finally, an intraframe video data compression system and method is disclosed to complement the disclosed video decoding and displaying system.

Chroma upsampling method and apparatus therefor

Abstract: A unique method for chroma vertical upsampling used, for example, for conversion of the “4:2:0” format chroma information used in many applications of digital video, to the “4:2:2” or “4:4:4” format, is presented This conversion is required so that video encoders can effect the display of this chroma information with a minimum of visible artifacts The present invention carries out chroma vertical upsampling on a pixel by pixel basis This chroma vertical upsampling is performed as a function of the amount of motion associated with each pixel as detected between 2 or more fields, and the field, frame and progressive sequence characteristics of the incoming video signal data