Aspect selection of video down conversion

At present, many TV stations use 16:9 HD camera shooting, but many local stations broadcast signal is 720x576 PAL format, need to do the next transformation of the collected material.

The lower converter will provide a variety of down-conversion methods, before I mention the letter of the Edge way, this time I focus on cut cut edge way, this should also be the majority of TV workers in the post-editing will be used.

1920x1080 aspect ratio is 16:9, do the next transformation is to do 5:4 of the cutting or 4:3 of the cutting, in principle, 5:4 of the cutting is the most accurate, why? Because the current TV broadcast signal is 720x576, just 5:4 of the aspect ratio, The cut out of the signal to do the scaling is not deformed, but in order to adapt to the current LCD TV display characteristics, SD signal broadcast, the effective content of the majority of the application to use a 4:3 aspect ratio, 16:9 of the signal cut to 4:3, and then reduced to 5:4 of the PAL output format, the scene will be high up and down, Is that the scene will pull up, but the overall picture is to maintain a 4:3 aspect ratio, 4:3 of the crop is more than 5:4 of the crop will retain more lateral pixel information, because the 5:4 and 4:3 conversion of the public factor is 15:12 and 16:12;4:3 format will retain a little more pixels without distortion too much, It also conforms to most of the current 4:3 production trends.

Of course, the photographer will take into account the composition of 4:3, even if they use 16:9 of the camera, in the shooting will also consider the composition, the focus of the characters and scenery in the area of 4:3, the next transformation, even if the cutting off the left and right pixels, will not affect the content of the program understanding.

Aspect selection of video down conversion