Motorola Corporation

Reji Mathew

Jian Zhang

Xing Zhang

Zhenghua Yu

A decoding system, a RGB video color converter and a method for color conversion of at least part of a decoded currently received YUV frame representing an image is provided. The currently received YUV frame includes image blocks and RGB color conversion is performed by storing a previous color conversion RGB image in a RGB buffer, the image being from an immediately preceding received decoded frame. Next, identifying is effected for identifying the image blocks of the decoded currently received YUV frame that are unchanged relative to corresponding previous image blocks in an immediately preceding received decoded frame. Thereafter, selectively performing YUG to RGB color conversion is effected only on the image blocks of the currently received YUV frame that are not unchanged relative to the corresponding previous image blocks. This provides selected RGB converted blocks for the current frame and then selectively updating image blocks in the buffer with selected RGB converted blocks for the current frame is performed. The resulting RGB image is then displayed on a display module.

Decoding system, video color converter and method thereof

A method for determining motion vectors in an interlaced video coding system for coding images comprising interlaced odd and even field. The method () includes selecting () a current odd field block and a current even field block that respectively comprise odd and even fields of a selected current image block. Differences are identified () and thereafter, suitable best matching odd and even field matching reference blocks are determined (). From the suitable best matching odd and even field matching reference blocks a reduced field search area is provided () that is used to complete further searching () and selection of field motion vectors (). Pseudo-frame motion vector selection is also conducted () and a preferred motion vector is selected () from either a field motion vector pair or pseudo-frame motion vector.

Interlaced video motion estimation

A method ( ) and decoder system ( ) for reducing quantization effects or ringing artifacts imposed upon decoded image of hybrid block based coding schemes such as MEPG and H 261. The system ( ), in use, and method ( ) receive ( ) decoded image decoded blocks that were decoded from transform coded blocks quatized by a selected quantization parameter. The system ( ) and method ( ) then analyze ( ) selected pixel values of selected pixels with neighboring pixel values of associated neighboring pixels in the decoded blocks to determine difference values for each of the selected pixels. Potential object edges, of the decoded image represented by the decoded blocks, are then detected ( ) to identify the selected pixels as edge pixels, the detecting is effected by comparing the difference values with selected threshold values that are determined with respect to the selected quantization parameter associated with the blocks. The selected threshold values have a non-linear relationship with varying quantization parameter values of the image. The selected pixel values are modified ( ) if they are not identified as edge pixels.

Method and decoder system for reducing quantization effects of a decoded image

Apparatus ( ) for compensating for jitter in a digital image forming part of a video sequence of such digital images includes a first motion estimation unit ( ) having an input for receiving sensed image data and an output for providing a first plurality of motion vectors, each corresponding to one of a plurality of image blocks making up the digital image. A jitter estimation unit ( ) determines a jitter vector from the first plurality of motion vectors for the digital image and a jitter compensation unit ( ) adjusts the digital image using the jitter vector to compensate for jitter in the digital image. A second motion estimation unit ( ) provides a second plurality of motion vectors, each corresponding to one of a plurality of image blocks making up the jitter compensated digital image. The second plurality of motion vectors are determined by utilizing the first plurality of motion vectors and the jitter vector. The second plurality of motion vectors can be used in coding the jitter compensated image for storage and/or onward transmission.

Method and apparatus for compensating for jitter in a digital video image

A method of estimating motion in interlaced video involves, firstly, a frame search ( ), where a search is conducted for the frame structure using a sub-sampled block matching metric (e.g. sub-sampled SAD). The locations to be searched are either fixed or dynamically determined based on the minimum frame SAD (ie best frame block match). Next, pixel errors are calculated ( ) for all pixels included in the sub-sampled block matching metric. Each pixel error is first identified as belonging to one of four field patterns (e.g. even-even, even-odd, odd-even and odd-odd). For each location, pixel errors can be classified into two field patterns, either even-even and odd-odd or even-odd and odd-even ( ). The pixel errors belonging to the same field pattern are added together ( ) to obtain field error values (eg field SAD values). The individual field error (or field SAD) values are used to determine ( ) the field Motion Vectors. The location of the lowest field SAD value is taken as the position of best match. All pixel errors are then summed together ( ) to obtain the frame error and the location of the lowest frame error (or frame SAD) is taken as the position of best match for the frame. The frame and field Motion Vectors can be refined by using a full block matching metric within the small search window ( ).

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Riverwood, Australia

Reji Mathew