Region of interest (roi) video encoding
AssigneeTexas Instruments Incorporated
InventorsMehmet Umut Demircin, Do-Kyoung Kwon, Naveen Srinivasamurthy, Manoj Koul, Soyeb Nagori
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Abstract
A method of encoding an image frame in a video encoding system. The image frame has a region of interest (ROI) and a non region of interest (non-ROI). In the method, quantization scale for the image frame based on rate control information is determined. ROI statistics based on residual energy of the ROI and non-ROI is then calculated. Quantization scale for the image frame based on ROI priorities and ROI statistics is calculated. Further, quantization scales for ROI and non-ROI based on ROI priorities are determined.
Claims15
A method for encoding an image frame in a video encoder, the method comprising:
- determining quantization scale for the image frame based on rate control information, the image frame having a region of interest (ROI) and a non region of interest (non-ROI);
- calculating ROI statistics based on residual energy of the ROI and non-ROI;
- modulating quantization scale for the image frame based on ROI priorities and ROI statistics;
- and
- determining quantization scales for ROI and non-ROI based on ROI priorities.
A method for encoding an image frame having a region of interest (ROI) in a video encoder, the method comprising:
- determining average motion within the ROI for a current image frame;
- determining an ROI for a next image frame by moving the ROI in the current image frame in the direction of motion by a value corresponding to the average motion;
- and
- using the ROI for the next image frame in a subsequent image frame in response to a temporal discontinuity between the next image frame and the subsequent image frame.
A video encoding system comprising:
- a set of prediction engines that calculate region of interest (ROI) statistics based on residual energy of a ROI and a non region of interest non-ROI in an image frame;
- and
- a rate controller that receives encoded bits of an image frame, average quantization scale of the image frame, ROI priorities and the ROI statistics and that generates quantization scale for the image frame by modulating quantization scale for the image frame.
Dependencies are inferred from the claim text.