osd character display blur in yuv format

Wonder Won

Hi, everyone,

I work in IPNC36x reference design, I write my own string draw function like ALG_swosdDrawLine(), but I found a strange display problem. It seems the Chroma of my character's dot matrix data impact adjacent pixel's color. My english is pool, I don't know how to discript the phenomenon, maybe I can call it blur or vignette. The snapshot picture is following,

To expose problem, I streched out the picture. Note, In the surrounding of the green characters, have some blur, its color different with backgound.

I don't know why. I just only modify chroma data for character's display dot. In fact, I treat a yuv macro pixel (in yuv420, 2X2 Y, 1 UV) as a display dot, that is to say, I zoom out the character size 2 times in horizonal and vertical direction.

can anyone get some help? thanks!

over 14 years ago

0 Anshuman Saxena over 14 years ago

TI__Mastermind 19985 points

Can you please share the YUV data after doing the ALG_swosdDrawLine() routine? Also, please let share with us the original input YUV data and the overlaid YUV that you are using? We need to see the data to figure out the problem you are mentioning.

Regards,

Anshuman

0 Wonder Won over 14 years ago in reply to Anshuman Saxena

Intellectual 995 points

Thanks Anshuman,

following is my yuv file and corresponding code,

if(stop)
{
     OSA_fileWriteVideoData("/mnt/mmc/BeforeOSDraw.yuv", prm->videoInOutAddr,
     prm->videoInOutAddr + prm->videoOffsetH*prm->videoOffsetV, prm->videoWidth, 200, prm->videoOffsetH);
     ALG_swosdDrawString(prm, &strInfo_cn);
     ALG_swosdDrawString(prm, &strInfo_en);
     stop = 0;
     OSA_fileWriteVideoData("/mnt/mmc/AfterOSDraw.yuv", prm->videoInOutAddr,
     prm->videoInOutAddr + prm->videoOffsetH*prm->videoOffsetV, prm->videoWidth, 200, prm->videoOffsetH);

}

4760.BeforeOSDraw.yuv420.raw.txt

8130.AfterOSDraw.yuv420.raw.txt

I am sorry I don't know any tool or howto check these raw yuv data file. so I give the yuv data save code.