Massive ISP Upgrades

I’ve been hearing for some time now that 2022 flagships will have massive camera upgrades, and the new features of the next-gen SoCs being described by MediaTek and now also Qualcomm explain why that is.

The new ISP of the Snapdragon 8 Gen 1 falls under a new marketing name – “Snapdragon Sight”, and includes large improvements of the capabilities of the IP blocks within the image processing chain.

The big flagship feature being advertised is the fact that the new ISP is now capable of 18-bits of color depth per channel, up from the previous generation 14-bit ISP. While mobile image sensors nowadays still are barely 12-bit native in terms of their ADCs, the ushering of new HDR techniques such as staggered HDR capture, where exposures are immediately subsequent to each other on the sensor’s readout, means that new phones now are able to capture images a lot faster, recombining them into higher bit-depth results. Particularly here, the new 18-bit ISP pipeline now allows for three exposure HDR stacking off these new sensors.

The increased bit-depth should allow for an increase of 4 stops in dynamic range (or 2^4 = 16x the range), which greatly helps with very contrasting environments and challenging lighting situations. This is quite beyond any other camera solution right now, and being able to have this implemented in such a hardware fashion sort of blurs the line between traditional image capture techniques and the more software-defined computational photography methods of the last few years.

Indeed, the new ISP architecture seems to be very much a way to implement many of the existing computational photography techniques into fixed-function blocks: there’s a new neural-net controlled 3AA (auto-exposure, auto-focus, auto-white-balance) and face detection block, which sounds eerily similar to Google’s HDRnet implementations.

Night mode is also said to be vastly improved through a new multi-frame noise reduction and image stacking block, being able to now stack and align up to 30 images, and achieve also much finer detail this generation. Qualcomm here claims up to 5x better night mode shots.

Further improvements include a new distortion correction block that’s able to now also correct for chromatic aberrations, and a hardware video Bokeh engine, being able to operate at up to 4K video recording. Think of it as the same as the new Cinematic mode on the new A15 iPhones, but not only limited to 1080p.

Qualcomm notes that all the AI/ML/neural network features on the ISP are actually run and accelerated on the ISP itself, meaning that it is not offloaded onto the Hexagon dedicated ML processing blocks or the GPU.

Just as a note- Qualcomm’s 3.2Gigapixel/s throughput metric here seems low compared to the Dimensity 9000’s 9Gpixel/s, it’s possible that the companies are advertising very different metrics, with MediaTek advertising the throughput of lower-bit depth pixels coming from the image sensors per frame, while Qualcomm quoting the full bit depth pixel processing within the ISP itself.

In terms of video encoders and decoders, the new chip allows for 8K HDR recording now, but otherwise is seemingly on par with the Snapdragon 888 media blocks. Unfortunately, this also means no AV1 decoding this year yet again. Qualcomm isn’t part of the Alliance for Open Media consortium and instead is backing VVC/H.266 and EVC, however with AV1 being actively pushed by Google and YouTube, and seeing large adoptions such as by Netflix, it’s becoming questionable for Qualcomm to still not support the format in 2022 devices.

AI Performance - Iterative, but solid

Last year’s Hexagon IP block was a very large change for the Snapdragon 888. At the time, Qualcomm moved on from a more segregated DSP/AI architecture to a single more fused-together block being able to operate on scalar, vector, and tensor operations at the same time. This year’s iteration is an improvement of that larger change. Qualcomm notes that amongst many changes, they’ve doubled up on the shared memory of the block, allowing for greater performance for larger ML models (which are growing at a very fast pace).

Qualcomm didn’t note any TOPS figures this time around, instead stating we’re seeing 2x the tensor throughput performance, and smaller increases for scalar and vector processing. They do quote a day-1 to day-1 performance increase of 4x when compared to the Snapdragon 888, via a combination of both hardware and software improvements, but of course that figure is smaller when comparing both platforms on an equal software footing.

Power efficiency for AI workloads is said to be 70% better this generation, which is actually more significant, and should help with more demanding sustained ML workloads.

X65 Modem Integrated

In terms of connectivity, the Snapdragon 8 Gen 1 is quite straightforward, as it integrates the X65 modem IP that Qualcomm had already announced as a discrete model earlier this year.

The improvements here are the fact that it’s a 3GPP Release 16 compatible modem, including new features such as uplink carrier aggregation. Other improvements are 300MHz of Sub-6 bandwidth on 3 100MHz carriers, and an increase of the mmWave bandwidth from 800 MHz to 1000MHz, allowing a new peak theoretical downlink speeds of 10Gbps.

Introduction & Specifications - CPU & GPU Conclusion & First Impressions
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  • Silver5urfer - Tuesday, November 30, 2021 - link

    It all depends on how it will perform in a phone chassis. SD888 was overheating mess. I hope this addresses it. Also "Desktop Capabilities" that gave a big laugh. The interesting thing is Adreno Control Panel.

    Still the games are going to be Android only which are mostly MTX garbage. I miss the era of nice Indie platformers, puzzles and innovate games like Edge Ex, Alto, Skyforce Reloaded. Who wants that COD junk in mobile again.

    A15 performance or not the real world is what I'm at. Gotta see how it's more efficient, the bragging performance metrics are useless when the phone barely gets the SOT improved. Qcomm is a much better choice than MediaTek solely because of CAF and OEM support for Kernel SRC and others. Sadly Samsung phones in US won't have any BL Unlock due to American Carrier Mafia.
  • TriniX10257 - Tuesday, November 30, 2021 - link

    Is it confirmed that there's no hardware AV1 decode support?
  • Andrei Frumusanu - Tuesday, November 30, 2021 - link

    It doesn't have it.
  • Frenetic Pony - Tuesday, November 30, 2021 - link

    Oh yay, your $1k+ flagship phone won't have a key update relevant to a major use case.
  • Silver5urfer - Wednesday, December 1, 2021 - link

    Not even A15 has it, So there's no need for Qcomm to put more money into it. As simple as that. AV1 this that I see this everywhere as the coming of next revolution. Upon checking it's not even that great on the old hardware to decode so no wonder not all Netflix, Amazon, Disney Plus, Apple nobody is strictly using that. They use VP9. As for game streaming, not even Ampere has the encoder.

    I doubt AV1 will be widespread before 2025. HEVC is used in BluRay 4K Discs. Nobody uses this new standard and it took a long time to transition from old codecs. So many BD rips do not use H.265 either, still the world is on H.264 or similar ones.
  • vladx - Wednesday, December 1, 2021 - link

    And Apple is actually part of AOM which defined AV1 and the successor AV2, which is even more laughable. Let's face it, HEVC&VVC have already won over AV1&AV2.
  • brucethemoose - Wednesday, December 1, 2021 - link

    I'm not sure what you're on about, as VVC usage is pretty much nonexistent. Big streamers don't want to touch it with a 10 foot pole, and the more "friendly" EVC seems kinda meh.

    If any codec "won," its h.264.
  • vladx - Thursday, December 2, 2021 - link

    VVC's competitor is the upcoming AV2 codec, not AV1. And while AV2 is still in the drafting stage, hardware supporting VVC decode has already been released.
  • syxbit - Thursday, December 2, 2021 - link

    I'm not sure why you're complaining and criticizing AV1 so much.
    AOM (who define AV1 etc..) has the backing of Amazon, Apple, AMD, ARM, Facebook, Google, Microsoft, Intel, Nvidia, Samsung, Mozilla, Netflix, Youtube etc...

    It's no longer a battle. AOM have won. Netflix, Prime Video, Youtube etc.. will be using AV1. So either support it, or expect lower resolution or software decoded video that chews through your battery.
  • vladx - Thursday, December 2, 2021 - link

    Yeah they all support AOM with words but not all follow through, just look at Apple. HEVC is the winner in terms of adoption as hardware support beats claims made companies.

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