| 摘要 |
A method for constructing a combined image from initial images representing the same scene, a first initial image 510 having a first resolution and a second initial image having a second higher resolution, comprises the following steps. Spatial parameters, such as position and size, of a region of interest in the second image, corresponding to a region of interest (ROI) 515 in the first image are determined. The ROI may be user selected. The first image is then partitioned into coding entities according to the spatial parameters, to define a subset of coding entities corresponding to a zoom area. The second image is partitioned into coding entities based on those of the first image. Coding entities of the second image in the zoom area and of the first image outside the zoom area are then encoded and combined into a bitstream 540. The size of the zoom area in the first image is preferably substantially equal to the region of interest in the second image. The method may be used to reduce the amount of data required to transmit surveillance image data to mobile devices, while depicting a high definition area of interest. |
