Sergey Chikuyonok gets his Philips Ambilight foo on as he created a HTML5 video + canvas sample that mimics the TV effect.
As the video runs, a snapshot is sent over to JavaScript land where colors are worked out:
PLAIN TEXT
JAVASCRIPT:

function getMidColors(side) {

        var w = buffer.width,

                h = buffer.height,

                lamps = getOption(’lamps’),

                block_width = getOption(’block_size’),

                block_height = Math.ceil(h / lamps),

                pxl = block_width * block_height * 4,

                result = [],

                img_data = buffer_ctx.getImageData(side == ‘right’ ? w – block_width : 0, 0, block_width, h),

                total_pixels = img_data…

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