In the SNAKES deformable model segmentation method, the “snake pit” refers to the snake converging towards a strong gradient/edge along the object boundary.

In the space below, program a basic skull stripping method to obtain skullstripped.png from original.png (use other information provided to help). Hint: utilize (i) a thresholding method (see thresholdeded.png) and (ii) a morphologic operation as intermediate steps. The skull has a thickness of 40 pixels.   

How can we compute the angle of the gradient of a 2D image? (choose the best answer)  

Why do we like to write spatial transforms in the homogeneous form? (choose the 1 best answer)

In binary morphology, a closing operation is a great way to remove small fjords

An unsharp mask filter: (choose 1 best answer)

Dynamic programing includes hard constraints requiring connectivity.

Derivatives of the compound shown below are currently being examined for their effectiveness in treating drug addiction and metabolic syndrome (J. Med. Chem. 2006, 872). Which sequence ranks the following aromatic rings of this compound in order of increasing reactivity in an electrophilic aromatic substitution reaction (slowest to fastest reacting)?

Which of the following compounds will undergo Friedel-Crafts alkylation with (CH3)3CCl, AlCl3 most rapidly?

In carbon NMR, the carbon atom of the carbonyl group in aldehydes and ketones has a chemical shift of about ________.