# Difference between revisions of "AAMToolbox simplify point model"

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[[File:Deviations_of_a_particular_point_model_AAMToolbox.png|700px|Point model in ModelViewer]]<br> | [[File:Deviations_of_a_particular_point_model_AAMToolbox.png|700px|Point model in ModelViewer]]<br> | ||

Result of Calculating the Weights (see button) . Notice that the bars representing the principle components have been adjusted to show how far this approximation to the point model deviates from the mean.<br><br> | Result of Calculating the Weights (see button) . Notice that the bars representing the principle components have been adjusted to show how far this approximation to the point model deviates from the mean.<br><br> | ||

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+ | Here, we have referred to''' shape space but what is it'''? Project into shape space? See next tutorial. |

## Revision as of 20:36, 20 February 2012

**What does it mean** to best fit the shape model to a particular image point model

All the point models were used to find the shape model. If there were just two dimensions, this would be similar to fitting a straight line to *y=ax* by finding *a*. In the Cartoons shape model, there are 34*2=68 dimensions yielding 68 components. However, most of these represent noise and the Stats Model Generator found that 95% of the variance could be accounted for by just 5 of the components. So we should (actually, might is a better word) be able to represent any of the point models that we used to build the shape model. Here, we **project a particular point model into shape space, take the 5 principle components (setting the rest to zero), and project the result back into our normal viewing space**. The result should look similar to the point model itself.

In the act of** loading an image file** (highlighted in sub-window). Red ellipses highlight the buttons needed to load an image - actually the point model associated with an image - calculate the associated weights and reset the model back to the mean again.

You can also **load point models directly** but clicking the *Import Ref. shape* button.

Result of Calculating the Weights (see button) . Notice that the bars representing the principle components have been adjusted to show how far this approximation to the point model deviates from the mean.

Here, we have referred to** shape space but what is it**? Project into shape space? See next tutorial.