Ninth session, indian summer

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Personal photo by author, October 2018.

A little better results this time compared to last but more interestingly, I managed to get a complete session with the sun in the front of the canvas. I learned that (a) the canvas is glossier than I expected so the sun causes bright highlights on the canvas, and (b) the player can cast a shadow on the canvas. I had imagined having to deal with shadows but not the player’s own.

Note glossy highlights as well as simultaneous player, stick and puck shadows on canvas. Personal photo by author, October 2018.

I also realized that the mobile I’m using for recording the canvas has dual lenses. The 2x zoom setting makes for both less perspective distortion and much better input data as the canvas now covers a larger part of the recorded image. Of course, this will have to be scaled down during image analysis but having better source data should be an advantage. The Apple models that have dual lenses are iPhone 7 Plus, iPhone 8 Plus, iPhone X, iPhone XS and iPhone XS Plus so it is reasonable to use in testing (I probably should have only used this setting and then applied the results on a lower resolution video to see if the results were still applicable.)

1x (left) vs 2x (right) lenses on iPhone X compared in terms of resulting canvas size with approximately the same tripod distance. Personal illustration by author, October 2018.

Additionally, I introduced three targets even though I have not reached the level of ability where it is needed (or even helpful). Spinning a positive angle, it makes practice more challenging and fun as well as helps the puck spread out over the whole canvas.

Two additional targets added. The targets are fastened by tape and can be moved easily. The numbers are written with erasable whiteboard marker. Note the number of puck marks on the canvas, hopefully this does not interfer with image analysis. The marks do not come off easily but I am trying to find solutions by reading hockey forums as puck marks is a problem for both players and people trying to keep ice rinks clean. Personal photo by author, October 2018.

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