| 摘要 |
<p>The invention concerns image enhancement, particularly the enhancement of images which have been encoded. The invention leads to a better image quality. The images may be part of a video sequence for transmission, or which has been received after transmission. <??>One method in accordance with the invention removes artifacts from block transform-based encoded/decoded images. Another method in accordance with the invention involves, in sequence, enhancing a received image by separating the image into its constituent colours, performing a filtering step, re-combining the colours, convolving the image with a weighted filter matrix, and then re-scaling the pixels of the image. <??>The methods of the invention permit a method of performing a quality assessment on a decoded image. The method of quality assessment comprises the steps of modifying the decoded image to produce a substitute source image, and comparing the decoded image to the substitute source image in accordance with a quality assessment technique, thereby producing a quality assessment metric. <IMAGE></p> |
