I think you will lose this one.
Basically, it is two against one against you.
Cops have shown me time and again that they do not care what the truth is, even under oath. I have seen cops lie in their testimony, in order to get convictions. Then, if you tell the truth, it is your word against the cop's word. The magistrate judging the case also wants to register a conviction, so the magistrate will choose to believe the cop and not believe you.
If I understand the situation accurately, you stopped at the line, then inched forward and perceived an opportunity to go safely through the intersection. But the cop didn't see you stopped, only seeing you inch forward without stopping and then go through the intersection.
Perhaps you should concentrate on the distance between the stop line and the proper vantage point for determining you could safely go through. If you can establish that is a significant distance, say three meters, you may be able to convince the magistrate that the cop merely didn't notice you "way back from the corner" where the line requires you to stop, and where in fact you did stop.
You cannot, CANNOT suggest the cop is lying. That IMMEDIATELY puts the magistrate against you, and dooms your chances. If you can suggest that you did your best, by stopping where you had to stop, and by properly ascertaining the way was clear; and the cop also did his best, by watching all the traffic at this busy corner, and by seeing you go slowly through, but the cop simply did not observe you come to a full stop, because that was not an action that required him to take any action, and it happened at the stop line, distant a full three meters (but you measure it, OK?) from the place where you need to be to determine passage is safe.
Understand that you must measure the distance, and you may ask the cop if he measured the distance. If you did, and he didn't, then you can exaggerate it a tad, because nobody can contradict you on the measurement. If THEY don't feel any need to tell the truth, YOU needn't ... but please be careful when stretching the truth. Four meters OK, but not twelve, eh?
Good luck, and please remember to tell us how it came out.