This will not have escaped anyone: Samsung benefited from the MWC that just opened its doors to announce its new flagship, the Galaxy S7 and S7 edge. If both opt for a “new generation” sensor, the novelty lies neither in its diagonal (1 / 2.5 “) nor in its resolution (12MP, 16MP against the GS6), but in a technology that aptly named. Dual Pixel AF … Look, there’s something that should remind the Canonists users of the EOS 70D
There’s only a week, we approached technologies that could land in smartphones so they improve their image quality to the point of equaling that of a reflex, to use a formulation so appreciated by the communicating of all kinds. It seems that Samsung, in this question, decided to make a very radical solution. to do as well as a reflex, so do as a reflex in this case, to provide an autofocus and image quality still rising, not hesitate not to borrow one of the most interesting technologies in recent years, we have appointed the DualAF.
Small flashback . In July 2013, Canon introduces its new APS-C DSLR expert, the EOS 70D. It does not revolutionize the genre, except for one detail: he is the first SLR camera of all brands, using a sensor using the Dual AF technology (JP, 2013-228692A) and remains the only one to operate until the next EOS-1D X and EOS 80D Mark II. The aim is to overcome the slow SLR autofocus in video and liveview by directly integrating the phase detection on the sensor. To do this, each pixel is divided into two photodiodes (so there 40.3 million photodiodes for a sensor of 20.2 MP), each photodiode can be read independently to perform the phase detection based on the difference? physical. This system has the advantage of being predictive, since it is he who controls the lens movement while on a conventional sensor, the AF module is simply validate (or not) the development. During the presentation of this technology, we had fun writing it “ operation [is] so awesome that one comes to wonder why no one thought of before. ” But that that was before Samsung is talking this weekend its Galaxy S7 which aims to “ set a new standard in mobile photography ” [sic].
the principle remains the same: each pixel is divided into two photodiodes. On the Galaxy S7, definition 12MP, this implies that it takes 24 million photodiodes. The photosite well so far 1.4 micron (1.43 to be exact), but each photodiode measure “only” 0.7 micron wide. This implies two things. The first is that to capture the image, all photosites contribute and despite the relative losses induced by technology, capturing light advantage indeed larger “pixels”. The second is that the entire sensor part in the AF measurement, with 12 million of photodiodes and not more than 5% of the sensor (ie 0.8 million photodiodes) as was the case on the Galaxy S6. We understand easily how the S7 manage to be faster, to the point that our colleagues, who have been able to have on hand, speak of a “ Instant AF speed if she would spend almost one GS6 of a product behind. “
no doubt, the Galaxy S7 will be faster than their predecessors, both in terms of AF in terms of treatment image (fewer pixels, more powerful processors) except hiccup. Dual AF technology, however, by no means guarantees an increase in image quality. On the contrary, if the scenario found on the Canon EOS 70D occurs, we should even see a slight drop in quality amount sensitivity to GS6, coupled with a lower dive sensation, which is also explained by the well GS7 any definition of the sensor by the adoption of Dual AF architecture. This structural inconvenience will not, at first, compensated by improved image processing algorithms, that have already seen our colleagues on site since they speak of a “ result [ which] seems surprisingly smooth, where the treatment of GS6 left room for a bit more natural in the transcript, to a much lesser effect of heavy reworking of the image. “
in short three questions arise: Samsung has he sacrificed quality raw image for the benefit of the speed of AF, and there are specific agreements between the Korean manufacturer and the Japanese manufacturer? Otherwise, attention to the patent war (oh yes, another one!). Finally, why Canon does not he use his technology Dual AF elsewhere than on a handful of his reflex?
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