Three images blending engine supporting multicolor formats, various color depths with small-gate size and high-quality image for SOC design
Thang Minh Le, Kazushi Akie, Toyokazu Hori, Hiroshi Hatae, Hiromi Watanabe · 2009
A small Color Space Conversion (CSC) block in Video Input/ Output (VIO) architecture can efficiently support both standards: ITU-R BT.601 and ITU-R BT.709 for RGB and YCbCr color format. The design of an arbitrary (programmable) coefficient helps to reduce the size of CSC block. A new dithering technique is implemented to achieve the advantages, high-quality image and no buffer memory, of Error-diffusion algorithm and Ordered algorithm. With a small gate count, VIO can also support effectively 4 different inputs with multicolor format, various color depth. This VIO has been used in a SOC chip for mobile phone. The detail of VIO design is described in this paper1