image scaler bicubic verilog
s3034585 said:
Hi Guys
Does any one have a idea about how to do image resizing using fpga. I am suppose to work on a project for image rezising. We need to change the resolution of the image using fpga.
does anyone has any material on this.
Pls let me know
thanks in advance
tama
I've seen this topic comes up so many times someone ought to write a tutorial about it.
To resize an image takes two processes, resize horizontal and resize vertical. To resize
horizontal is easy but resize vertical needs line store.
To resize, we use either a upsampler or decimation filter or polyphase filtering.
In some way, they are the same thing. Upsampler or decimation filter usually
has a fix scale amount and design into it. Polyphase allows variable scaling.
I learn mine from ADSP-21XX signal processing application handbook. I think it
is vol.2 (It has 3 vol.). There is a couple of chapter has very detail explanation of
how a signal is resampled. This apply to video also.
You can also google decimation filter or polyphase phase filter. But you probably
will get a lot of technical paper that only confuse you.
Gunship