Comments on: Dirt cheap frame grabber https://www.epanorama.net/blog/2020/07/11/dirt-cheap-frame-grabber/ All about electronics and circuit design Fri, 17 Apr 2026 09:55:43 +0000 hourly 1 http://wordpress.org/?v=3.9.14 By: Tomi Engdahl https://www.epanorama.net/blog/2020/07/11/dirt-cheap-frame-grabber/comment-page-1/#comment-1818540 Mon, 27 Nov 2023 18:04:03 +0000 https://www.epanorama.net/blog/?p=186512#comment-1818540 There was software that was running on the PC end. It sampled data from parallel port and then displayed it on screen. Capture approximately two frames time. Then process it by finding start sync pulse. Display frame. Clean receive buffer. Sample again and decode again.

The X resolution was quite low, due the limited rate PC could sample data from parallel port.
In Y direction the image was scaled so that several scan lines were summed together to form one output line. The summing allowed to increase effective number of pixel gray scale values it can get (so it look there is better Grey scale resolution than what the AD hardware can give).

]]> By: Tomi Engdahl https://www.epanorama.net/blog/2020/07/11/dirt-cheap-frame-grabber/comment-page-1/#comment-1813153 Mon, 11 Sep 2023 13:21:32 +0000 https://www.epanorama.net/blog/?p=186512#comment-1813153 How old school video digitizers worked
https://www.youtube.com/watch?v=4vpKsteIzJs

In this episode I take a look at how oldschool video digitizers like the “computer eyes” for the Commodore 64.

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