Fundamentals of digital image processing
Fundamentals of digital image processing
A TV sign image expander with built-in closed caption decoder
IEEE Transactions on Consumer Electronics
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To assist the deaf in viewing TV programs with sign images, a TV set top box capable of expanding sign images is developed. Its internal architecture mainly consists of video decoder/encoder, 256Kbytes of video memories, an infrared receiver and an FPGA based video processing unit. The FPGA implements an image expander, an I2C interface plus other control logic. The image expander uses a fixed 2x2 bilinear interpolation coupled with a nearest neighborhood input selection to allow 9 image scaling factors ranging from 1x1 to 2x2. The sign image that can be expanded is of the maximum size of 128x128 pixels or approximately 1/25 of the entire TV screen.