Re: [Gimp-developer] GPU-accelerated Image Filtering w/ CUDA
On 08/29/2010 08:13 PM, Alan Reiner wrote: > This is a long message, so let me start with the punchline: *I have a > lot of CUDA code that harnesses a user's GPU to accelerate very tedious > image processing operations, potentially 200x speedup. I am ready to > donate this code to the GIMP project. This code can be run on Windows > or Linux, and probably Mac, too.* *It only works on NVIDIA cards, but > can detect at runtime whether the user has acceptable hardware, and > disables itself if not.* > > Hi all, I'm new here. I work on real-time image processing applications > that must run at 60-240Hz, which is typically too fast for doing things > like convolutions on large images. However, the new fad is to use CUDA > to harness the parallel computing power of your graphics card to do > computations, instead of just rendering graphics. The speed ups are > phenomenal. > > For instance, I implemented a basic convolution algorithm (blurring), > which operates on a 4096x4096 image with a 15x15 kernel/PSF. On my CPU > it took *27 seconds* (AMD Athlon X3 440). When running the identical > algorithm in CUDA, I get it done in *0.1 to 0.25 seconds*, so between > 110x to 250x speedup (NVIDIA GTX 460). Which side of the spectrum you > are on depends on whether the memory already resides in the GPU device > memory, of it needs to be copied in/out on each operation. > > Any kind of operation that resembles convolution, such as edge > detection, blurring, morphology operations, etc, are all highly > parallelizable and ideal for GPU-acceleration. *I have a lot of this > code already written for grayscale images, and can be donated to the > GIMP project.* I would be interested to expand the code to work on > color images (though, I suspect just doing it three times on each > channel would probably not be ideal), and I don't think it will be that > hard to integrate into the existing GIMP project (only a couple extra > libraries need to be added for a user's computer to benefit from it). > > Additionally, the CUDA comes with convenient functions for determining > whether a user has a CUDA-enabled GPU, and can default to regular CPU > operations if they don't have one. It can determine how many cards they > have, select the fastest one, and adjust the function calls to > accommodate older GPU cards. Therefore, I believe the code can safely > be integrated and dynamically enable itself only if it can be used. > > My solution is for any image size (within the limit of GPU memory), but > the kernel/PSF size must be odd and no larger than 25x25. It's not to > say larger kernel sizes can't be done in CUDA, but my solution is > "elegant" for sizes smaller than that, due to having a limited amount of > shared memory. I believe it will still work up to a 61x61 kernel but > with substantial slowdown (though, probably still much faster than > CPU). Beyond that, I believe a different algorithm is needed. > > I have implemented basic convolution (which assumes 0s outside the edge > of the image), bilateral filter (which is blurring without destroying > edges), and most of the basic binary morphological operations > (kernel-based erode, dilate, opening, closing). I believe it would be > possible to develop a morphology plugin, that allows you to start with a > binary image, and click buttons for erode, dilate, opening, etc, and > have it respond immediately. This would allow someone to start with an > image, and try lots of different combinations of morphological > operations to determine if their problem can be solved with morphology > (which usually requires a long and complex sequence of morph ops). > > Unfortunately, I don't have much time to become a GIMP developer, but I > feel like I can still contribute. I will happily develop the algorithms > to be run on the GPU, as they will probably benefit my job, too (I'm > open to suggestions for functions that operate on the whole image, but > independently). And I can help with the linking to CUDA libraries, > which NVIDIA claims can be done quickly by someone with no CUDA experience. > > Please let me know if anyone is interested to work with me on this: > etothe...@gmail.com > > -Alan > ___ > Gimp-developer mailing list > Gimp-developer@lists.XCF.Berkeley.EDU > https://lists.XCF.Berkeley.EDU/mailman/listinfo/gimp-developer > Hi Alan, CUDA comes with a free but propietary license (far away from GPL ideology),is strictly system dependent (there are not a freebsd version for example) and is not opensource. It's important to say that CUDA is enabled on certain number of NVIDIA chip and not on generic accelerated graphic card,there are a big restrictions. Increase speed but to sacrify portability and code openness adding close source library is not a good idea for me, in addiction NVIDIA have a two face with opensource community, i don't trust that is reliable if there are any problems or suggestions. At the current
Re: [Gimp-developer] Dummy Layer with particular dynamic effect
On 08/29/2010 12:46 PM, David Gowers wrote: > On Sun, Aug 29, 2010 at 4:24 AM, Jacopo Corzani wrote: > >> >>> Well, adjustment layers is what GIMP developers seem to refer to as >>> "layer abuse" :) >>> >>> There are different ways to implement non-destructive editing. Would >>> you be interested to find out more? >>> >>> Alexandre Prokoudine >>> http://libregraphicsworld.org >>> >>> >>> >>> >> Hi Alexandre, >> i could agree with your consideration of "layer abuse" but adjustment >> layer is a quick and robust solution to manage effects whenever i want. >> Changing a curve (or any other "effect") dynamically without duplicate >> layers would be a great. >> Sure,i'm interested to find another quick way to handle "effects" during >> time without do an layer abuse, but i don't have any ideas that speed up >> work like adj layers... :) >> Thanks for your response. >> > Peter Sikking has already expressed a way of doing this: you attach a > list of effects to a layer or layer group. > > http://www.mmiworks.net/eng/publications/2007/05/lgm-top-gimp-user-requests_25.html > > As he observes, this avoids the problem of 'adjustment layers' not > actually being layers in any normal sense (that is, their lack of > content) while allowing the same or greater functionality. > This kind of layer's effect stack is currently under develpment (you post is dated to may 2007)? . It can be a great step to make gimp totally non destructive and easy to use.If this feature is under devel i would contribute in a development or test phase. Anyone know anything?There is an open task about that? Jacopo ___ Gimp-developer mailing list Gimp-developer@lists.XCF.Berkeley.EDU https://lists.XCF.Berkeley.EDU/mailman/listinfo/gimp-developer
Re: [Gimp-developer] Dummy Layer with particular dynamic effect
> Well, adjustment layers is what GIMP developers seem to refer to as > "layer abuse" :) > > There are different ways to implement non-destructive editing. Would > you be interested to find out more? > > Alexandre Prokoudine > http://libregraphicsworld.org > > > Hi Alexandre, i could agree with your consideration of "layer abuse" but adjustment layer is a quick and robust solution to manage effects whenever i want. Changing a curve (or any other "effect") dynamically without duplicate layers would be a great. Sure,i'm interested to find another quick way to handle "effects" during time without do an layer abuse, but i don't have any ideas that speed up work like adj layers... :) Thanks for your response. ___ Gimp-developer mailing list Gimp-developer@lists.XCF.Berkeley.EDU https://lists.XCF.Berkeley.EDU/mailman/listinfo/gimp-developer
Re: [Gimp-developer] Dummy Layer with particular dynamic
Sorry but i don't understand if this possible new feature (adjustment layer) is interesting or not? I would try to do an implementation, but if is useless or not interesting i will do other. What do you think? This is original message: --- Message: 1 Date: Sat, 28 Aug 2010 02:05:47 +0200 From: Jacopo Corzani Subject: [Gimp-developer] Dummy Layer with particular dynamic effect To: gimp-developer@lists.XCF.Berkeley.EDU Message-ID:<4c7852db.4040...@gmail.com> Content-Type: text/plain; charset=ISO-8859-1; format=flowed Hello, i think that would be very useful a dummy layer that can contains a particular effect/operation like curves in order to change parameters in future without any problems and eventually using a particular mask for handle particular zone where i don't want this. In this case is possible to activate or deactivate effects and change that parameters dynamically without any duplicate image layers with static effects. The problem may be in a user-defined plugins but for standard operation like levels or curves there isn't or i'm missing somethings? If i write an effect plugin would be perfect to associate that with this kind of dummy layer in order to change parameters/enable/disable/masking/unmasking that whenever i want. Sorry for my english :),i'm not a mother language... Jack ___ Gimp-developer mailing list Gimp-developer@lists.XCF.Berkeley.EDU https://lists.XCF.Berkeley.EDU/mailman/listinfo/gimp-developer
[Gimp-developer] Dummy Layer with particular dynamic effect
Hello, i think that would be very useful a dummy layer that can contains a particular effect/operation like curves in order to change parameters in future without any problems and eventually using a particular mask for handle particular zone where i don't want this. In this case is possible to activate or deactivate effects and change that parameters dynamically without any duplicate image layers with static effects. The problem may be in a user-defined plugins but for standard operation like levels or curves there isn't or i'm missing somethings? If i write an effect plugin would be perfect to associate that with this kind of dummy layer in order to change parameters/enable/disable/masking/unmasking that whenever i want. Sorry for my english :),i'm not a mother language... Jack ___ Gimp-developer mailing list Gimp-developer@lists.XCF.Berkeley.EDU https://lists.XCF.Berkeley.EDU/mailman/listinfo/gimp-developer
