image-manipulation

I would like to apply image processing on pictures taken on the iPhone. This processing would involve 2D matrix convolutions etc. I'm afraid that the performance with nested NSArrays would be pretty bad. What is the right way to manipulate pixel based images? Should I simply use C arrays allocated with malloc ? Have you looked at the Quartz 2D engine available in the iPhone SDK? Or perhaps Core Graphics? Apple has a nice overview document describing all the different imaging technologies available on the iPhone. Unfortunately there isn't anything as nice as ImageKit on the iPhone yet. I

For my final year project I'm doing a vehicle detail modification system. the system should be able to these following tasks. I'm using a size image of a vehicle taken from a fixed distance lets say from 5m. and different colors and rim images are stored I'm my application, that is is the basic idea. detect the tire and the alloy rim of the vehicle detect and measure the rim size of the installed rim apply a new alloy rim to the vehicle ( embed or put the alloy rim on top of the original image haven't decided yet) change color of the vehicle body apply tint colors to the vehicle windows

I have been doing some unsafe bitmap operations and have found out that increasing the pointer less times can lead to some big performance improvements. I am not sure why is that so, even though you do lot more bitwise operations in the loop, it still is better to do less iterations on the pointer. So for example instead of iterating over 32 bit pixels with a UInt32 iterate over two pixels with UInt64 and do twice the operations in one cycle. The following does it by reading two pixels and modifying them (of course it will fail with images with odd width, but its just for testing). private

I've got multiple images, and I'd like to load them each into a single <canvas> element at different points in time and then manipulate them using CamanJS . I can get the first image to appear like this: Caman('#canvas-element', '/images/one.jpg'); But then when I subsequently try to update that same element using the following code, it does not work. Caman('#canvas-element', '/images/two.jpg'); Is there some way to reset/clear/flush the canvas and load new image data into it, or do I really need to create separate <canvas> elements for each image I want to load? I'd prefer a single element