Frame sequential colour video experiment
As I have been lately playing around with NBTV mechanical television using Nipkow discs, I thought I'd experiment with field sequential colour that CBS experimented with back in the 1940s and early 1950s which can be explained in detail at http://www.earlytelevision.org/cbs_color_system.html . It pretty much involves a colour picture broken up into 3 B&W channels (each filtered by the 3 primary colours red, green and blue which make up a full colour picture when combined) and each picture sequenced one after the other on a B&W TV with a colour wheel filter wheel (consisting of red, green and blue filter segments) spinning in front of the TV corresponding to each picture in sync and with the persistence of human vision a colour picture is seen. I decided to have a crack at this experiment using a similar method to CBS's system but in my case it's frame sequential colour as I'm using the computer screen which is non-interlaced. Firstly I constructed the three segment RGB colour filter wheel which I stuck a clear protective DVD spindle base disc to a DC motor and stuck the printed RGB filter transparency to the disc and mounted it all on a wooden support. Then I splitted a richly coloured picture of a rainbow lorikeet to the red, green and blue channels which are three B&W images with luminances corresponding to each primary colour. Then I made a 60 frame/sec video animation of the three RGB channel B&W images sequencing one after the other repetitively for over 30 seconds and on playback you get a flicker B&W picture. Then I placed the RGB colour wheel in front of that video which the video and turned on the DC motor and after adjusting the motor speed to close as possible to correct sync speed and each colour filter segment correctly corresponding to the 3 B&W pictures sequencing one after the other, I got an accurate colour picture of the rainbow lorikeet, so this experiment was a complete success!!!:D Getting the exact speed of the motor was pretty much impossible so the RGB segments shift slowly hitting the wrong channels causing the hue to shift and you get the wrong colour compositions, so the lorikeet can be seen in an ever shifting colour hue which looks pretty psychedelic! Anyhow in this video I demonstrate the experiment explaining the process and showing the results and also I included a video recording of my Sony HVC-3000P trinicon tube colour camera filming the frame sequential colour picture as due to great after image persistence characteristic of the camera tube I get a much more stable view of the colour image unlike with the CCD phone camera which it looks flicker. I also talk about the CBS field sequential colour system which I pull up a couple of sites illustrating it in great detail. Lastly, my frame sequential colour demonstration is pretty much similar to the modern DLP projector systems used today which use a three segment RGB colour filter wheel that spins rapidly in correspondence to 3 B&W channels per picture frame outputting in sequence one after the other at very high speed which results in a nice non-flicker colour video or picture projected onto a screen. The DLP projector can be explained in greater detail on this site http://www.projectorpoint.co.uk/ProjectorLCDvsDLP.htm as seen DLP projectors using the old 1940s CBS colour wheel method rival over standard LCD projectors in image clarity!!!:D
As I have been lately playing around with NBTV mechanical television using Nipkow discs, I thought I'd experiment with field sequential colour that CBS experimented with back in the 1940s and early 1950s which can be explained in detail at http://www.earlytelevision.org/cbs_color_system.html . It pretty much involves a colour picture broken up into 3 B&W channels (each filtered by the 3 primary colours red, green and blue which make up a full colour picture when combined) and each picture sequenced one after the other on a B&W TV with a colour wheel filter wheel (consisting of red, green and blue filter segments) spinning in front of the TV corresponding to each picture in sync and with the persistence of human vision a colour picture is seen. I decided to have a crack at this experiment using a similar method to CBS's system but in my case it's frame sequential colour as I'm using the computer screen which is non-interlaced. Firstly I constructed the three segment RGB colour filter wheel which I stuck a clear protective DVD spindle base disc to a DC motor and stuck the printed RGB filter transparency to the disc and mounted it all on a wooden support. Then I splitted a richly coloured picture of a rainbow lorikeet to the red, green and blue channels which are three B&W images with luminances corresponding to each primary colour. Then I made a 60 frame/sec video animation of the three RGB channel B&W images sequencing one after the other repetitively for over 30 seconds and on playback you get a flicker B&W picture. Then I placed the RGB colour wheel in front of that video which the video and turned on the DC motor and after adjusting the motor speed to close as possible to correct sync speed and each colour filter segment correctly corresponding to the 3 B&W pictures sequencing one after the other, I got an accurate colour picture of the rainbow lorikeet, so this experiment was a complete success!!!:D Getting the exact speed of the motor was pretty much impossible so the RGB segments shift slowly hitting the wrong channels causing the hue to shift and you get the wrong colour compositions, so the lorikeet can be seen in an ever shifting colour hue which looks pretty psychedelic! Anyhow in this video I demonstrate the experiment explaining the process and showing the results and also I included a video recording of my Sony HVC-3000P trinicon tube colour camera filming the frame sequential colour picture as due to great after image persistence characteristic of the camera tube I get a much more stable view of the colour image unlike with the CCD phone camera which it looks flicker. I also talk about the CBS field sequential colour system which I pull up a couple of sites illustrating it in great detail. Lastly, my frame sequential colour demonstration is pretty much similar to the modern DLP projector systems used today which use a three segment RGB colour filter wheel that spins rapidly in correspondence to 3 B&W channels per picture frame outputting in sequence one after the other at very high speed which results in a nice non-flicker colour video or picture projected onto a screen. The DLP projector can be explained in greater detail on this site http://www.projectorpoint.co.uk/ProjectorLCDvsDLP.htm as seen DLP projectors using the old 1940s CBS colour wheel method rival over standard LCD projectors in image clarity!!!:D