Problem of interlaced image

[junkmalle]

This could be from integer scaling of an interlaced image. The top portion could be from one field, the bottom portion from the other field.

Consider the following algorithm where all variables are integers:

for (y=0; y<dest_height; y++)
{
____source_y = (y * source_height) / dest_height;
____(copy a line of pixels from source at source_y, to dest at y)
}

If source_height is exactly 2 * dest_height you get one field. But for other sizes you get sometimes one field, sometimes the other.

[deepakpansheriya]

i m not doing any interlacing here.

i just capture at half vertical resolution. n i do this on my windows 98 by using only wdm funcion.


and also i want to know message for overlaying in wdm

[junkmalle]

When are you going to get this through your head? Your camera always outputs an interlaced image. Your capture driver always captures an interlaced image. You (WDM) are scaling an interlaced image. Deinterlacing an interlaced image is not the same as starting with a progressive scan image. If you want a non-interlaced image you have to get a progressive scan camera.

[deepakpansheriya]

atlast i get solved problem by reinstalling driver.