Your links didn't work at all, so I can't give specific comments.
On Fri, Feb 28, 2014 at 1:02 PM, Aalekh Nigam <aalekh1993(a)rediffmail.com>wrote;wrote:
1)Alphabetical order captcha:We can use Html5's
drag and drop Api to list
a particular Set of images into one category .for example in the example
mentoined in the demo here ,i made a collection of diff words
starting with letters A,B,C ....as an output i grouped up words with
starting letter A diff from words with starting letter B,C....As,i used
text in this example we can use images of diff animals such as cat's and
dog.....and by drag and drop we can group images of cat and that of dog in
What if someone thinks your picture of a dog is "wolf", or "puppy",
"hound", or "terrier", or "animal", etc? Or what if the user
your images in Spanish or Chinese rather than English, resulting in a
Also, how easy would it be for the spambot to download the entire list of
images+names and just brute force it?
And what are the bot's chances by randomly guessing? If there are 8 images
to sort, it's a 1/40320 chance. Which isn't very good as far as captchas
go, 6 letters A-Z is 1/308915776.
2)Annotation captcha:We can use Images With
commons determine the subcategoriy the annotations belongs to and then give
relevant options to the users ;for example in the file we
can search from names of different annotations to which they corresponds to
from wikipedia(names given here are those of mountain) and then give the
the option's much relevant to the image.
What's to stop the spambot from finding the image on Commons?
And looking at that category, are users really going to be able to reliably
identify the "Fiat Grande Punto" in
or figure out WTF "UP 5" and "UP 6" are supposed to be in
or Colli Euganei in
or identify the birds by scientific name in
, or guess
which chloroplast (in German!) to pick in
3)Effect captcha:We can use image as a question which are changed by the
effect produced php's gd library and the use the same file with another
effect and then ask user to match the two files.....for
example:the image1 can be used as a question asking user to click
on the image that matches with the question image and as an answer we can
give this spiral image of the original image.Similarly we can
give filters to different images producing different options asking user
for right answer.
Spambots already solve this sort of thing when OCRing text captchas.
4)Direct captcha:We can ask to user direct questions
like ask for
selecting cat out of options consisting of images of cats and humans.....an
example by pginer demonstrate this example
I just replied to this idea at
5)Ask User to click on given effect: Asking user to
click on images
consisting of spiral effect's out of options which consist of images with
spiral and other effects(example:greyscale).
That requires people actually know what the effects names are, which
doesn't seem particularly accessible. And again, OCRing is probably harder
6)Drag and Drop character in Correct Place: We can use
drag and drop api
of html5 to ask user to form an particular alphabet or no out of the pieces
of character provided .Here is an example to form an character "A"
an digit "8" out of the same pieces of character.This drag and drop
capability can be further enhance to form a particular shapes.For example
form a clip art from a particular set of piece of shapes....for example the
image given hereinserts the correct nose as asked in the in the
questions out of the possible options provided.Most,Importantly i think
creation of an index system would be fruitful since it would rank the
inappropriate images on the basis of users response (rank is negative for
an image if user needs to reload a captcha) to a provided captcha.This as
the time passes will provide us with relevant images which are user
friendly and equivalently secure to use.......In addition i sincerely
appreciate a point mentioned by Gmansi of creation of jigsaw puzzle for the
images but in my view point there will be listing of some particular
category of images and those ranked higher in indexing system to be used as
jigsaw puzzle.as an additonal help we can use Extension
Assira to make our extension smarter.please give your valuable
suggestions as we can work to improve this amazing project. at
Computers can solve jigsaw puzzles, and probably faster than humans can.
Brad Jorsch (Anomie)