Huge differences in quality or level exist among conferences. Some are mere money-making machines, with
flawed reviewing, poor quality, fake credentials and even accepting computer-generated papers. Some national conferences just cannot compare to some selective international conferences. SIVA Conferences does not rank signal
and image processing conferences, nor decide which is bogus/fake/sham/scam, which is not. It cannot be liable on the quality of mentioned conferences. Just be aware of those blossoming bogus congresses, scam workshops, sham meetings or fake conferences. So if you want to attend a SCAM seminar, only attend this one: Séminaire Cristolien d'Analyse Multifractale (SCAM), at Université Paris-Est Créteil .
Some so-called conference organizations or scientific societies
are under the spotlight as bogus/spam conferences. In many countries, such conferences have been identified, and a paper accepted in those will not be taken into account in your resume, when applying for a position. They should thus be avoided.
They make you waste time, money (yours, your institution or your country) and, moreover, self-respect. But might be nice for vacations :) Try to send them the following paper.
Some guidelines and personal opinions about Academia, journal and conference publishing, university applications and evaluation processes are expressed in the following documents:
For the French "Conseil national des universites (CNU)", in the presentation: CNU 27 et Evaluation, by Daniel Etiemble;
In How to Get a Permanent Position in Academia, by Michael Schwartzbach and Anders Møller, Computer Science, Aarhus University, with acronym hints for academic spam conferences
An educated selection of sources (journals and conferences) is part of the every-day-job of a scientist. A conference is a great place to have your work evaluated by peers, to present your work, but more important: to discuss your work with qualified attendees, to attend and discuss other qualified attendees' work. Some rules of thumb to select a conference to submit to:
Being "International" does not suffice, as having a committee. Most scam conferences mimic the real ones. They even claim committee members that actually are not. So double-check if the committee members are known scientists in your field.
Check and double-check if the conference is considered as bogus/scam/sham or fake. Here is a list of hint:
Very short deadlines (less than one month between submission and acceptance, unless you know the organizers...), a too wide range of topics, lack of citations to conference papers (or only self-citations) and (seemingly) paradisiac places, altogether, are clues.
They claims to be indexed by many sites, including Google Scholar (which indexes almost everything), even ISI Web of Science indexing is not a reference
Then check on the Internet if the conference is considered as bogus or fake. Type "ConferenceName + fake" in research engines, look carefully. Second range of clues.
Do not be fooled by conference organizers spamming the web with fake blogs and web sites claiming the conference is serious. Serious conferences do not need to claim they are not fake, or pretend others are bogus. And be careful with contraposition.
Check if the conference is adapted to your paper proposal: try to read former years proceedings, check conference topics, technical chairs, scientific committee...;
Be careful with celebrities (Nobels, Fields medals) invited in plenaries. They may be Fool's gold (or pyrite);
Check whether the conference ever published a paper you have read and you consider interesting;
Check whether the conference ever published a paper somebody else you consider worthy has read and consider interesting;
Check whether people publishing in these conferences are knowledgeable in your field.
Talk to your colleagues, inform your advisors, ask former participants. Get advice. And always remember Richard Hamming 3 questions interview...: for new hires at Bell Labs:
What are you working on?
What is the most important open problem in your area?