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Dual camera optical zoom technology explained

Dual camera smartphone technology certainly isn’t new anymore, but we are seeing a new trend emerge whereby manufacturers are offering “optical zoom” capabilities inside their smartphones. Two notable models touting this feature are Apple’s iPhone 7 Plus and the new OnePlus 5. If you’ve been wondering exactly how this technology works and it these phones really offer optical zoom capabilities, then you’ve come to the right article.

The smartphone zoom problem

Before delving into the specifics of how this works, it’s probably best to recap why manufacturers have felt the need to offer optical zoom capabilities inside a smartphone. Unlike DSLR lenses with variable focal length lenses or point-and-shoot cameras with zoom lenses, smartphone cameras are stuck with small, fixed lenses. This means that a smartphone camera’s focal length is fixed, leaving no option but to rely on digital zoom to close in on details in an image.

However, digital zoom isn’t much good for more than minor zoom-ins, as we are stuck with a limited resolution and set field of view for near and far details, meaning that a pixel can only capture so much detail at a distance. This limitation is why images appear pixelated as you zoom in, and it’s exactly the same as simply magnifying the image in a gallery app post shutter.

Variable lenses, such as those found in DSLR setups, allow for an adjustable focal length and therefore field of view too. A longer focal length narrows the camera’s field of view, but this means that the same limited resolution image sensor captures its detail over a smaller area, so each pixel represents a finer point in space. So optical zoom doesn’t suffer from the same pixelation problems as digital zoom.

When it comes to measuring a camera or lens zoom, we need a reference or starting point for the camera or lens we’re talking about. To find any zoom level we divide the current focal length by the minimum available. So moving from 25 mm to 50 mm is equal to a 2x zoom, as is moving from 18 mm to 36 mm. Zoom is a relative term, but it has a direct relationship between two focal lengths.

Panasonic

Dual lenses offer a hybrid solution

When it comes to dual camera smartphones with a “telephoto” lens, we’re actually looking at two sensors, each with a lens pairing that offers up a still set but different focal length. For example, one may offer a 24 mm focal length and the other 36 mm, giving us 1.5x worth of optical zoom potential. The sensor sizes, pixel sizes, and lens aperture may also vary between sensors, which of course will have their own influences on image quality from each camera.

Optical zoom smartphones don’t have a variable focal length, instead the two cameras have their own fixed focal length (zoom level).

Looking at the iPhone 7 Plus, Apple has opted for one 28 mm and one 56 mm lens, offering up a 2x optical zoom potential. This means that we can capture close up shots with a 28 mm 1x zoom, and then simply switch to the 56 mm 2x zoom lens and capture pictures with at greater distances without any loss in detail.

Not only that, but this second camera also improves the image quality of 4x and higher zoom levels too. Because we’re starting at full resolution at 2x (rather than already halving it as we would be if we digitally zoomed in from 1x), we only lose half the information where we’d normally be losing three quarters of it at 4x. In other words, we shouldn’t reach that horribly pixelated look so quickly as we have more resolution for distant details.

See also:

OnePlus 5 vs iPhone 7 Plus vs Huawei P10: The Portrait Battle

4 days ago

It’s a similar state of affairs with the OnePlus 5, which offers up 1.6x optical zoom capabilities on the second lens before cropping down a 20 MP image to achieve a 2x zoom, and then relying on digital thereafter. OnePlus says that this is part of its Smart Capture software that takes the best information from multiple frames and stitches them together, which clearly isn’t optimal but it’s an intriguing hybrid approach. Even though the camera is throwing away some data to achieve a 2x zoom, the quality should still be improved over the old digital zoom method.

As well as offering up more detail at a distance, these dual camera setups also allow for advanced HDR processing that we’ve seen from other multi camera configurations. Even if the exact image details aren’t being shared with the final image, additional light and dark data can be used to bolster dynamic range processing, improving the look of the final image regardless of zoom level.

The results aren’t perfect

You may have realized that this still isn’t a perfect solution though. We need digital zoom if we want to venture beyond the maximum focal length, but what happens when we want to use a midway zoom level, such as 1.2, 1.3, or 1.5x?

The obvious solution is to simply rely on a digital zoom for these minor levels, as the degradation in quality won’t be too notable in most circumstances. Eventually, it will be possible to switch over to the second camera’s fixed optical zoom level, but this has the downsides of meaning that the zoom levels just below the switch will offer the worst quality.

It appears that dual camera setups are using powerful ISPs to judge which camera will give the best results in any given situation. So digital zoom is being used for shots in between the two cameras’ fixed focal lengths

So for example, 1.1x through 1.6x could be a digital zoom, then switching over to the second camera at 1.7x. This may explain why we’ve seen companies only opt for modest zoom distances, as the system is still reliant on digital zoom and too large a gap between lenses would produce a notable dip in quality.

See also:

How smartphone cameras work – Gary explains

May 8, 2017

To make this method a little smarter, the exact point of switchover doesn’t have to be set in stone. An image signal processor (ISP) could monitor the noise level of each camera and decide to make the switch to the secondary camera only if it will produce better results. We believe that both the iPhone 7 Plus and OnePlus 5 are using a system similar to this.

OnePlus’ Smart Capture method of combining data from multiple higher resolution images takes this one step further. By using multiple frames worth of higher resolution data, noise can be averaged out when zooming to those in between values like 1.2 or 1.8x. Although technically this can be done with just a single lens camera.

Simple camera switching isn’t really ideal though, and is clearly nowhere near matching the zoom capabilities insinuated by “optical zoom” advertising taglines. A possible solution is to turn to some more powerful image analysis algorithms in order to stitch up a picture from both cameras. Unfortunately this still has drawbacks compared with real optical zoom lenses though, as averaging and stitching is seldom as good as the real thing.

Today’s’ high-end ISPs are capable of merging together data from cameras with different focal lengths. This is already done for advanced HDR techniques and is taken a step further by ideas light the multi-lens Light L16 camera. This type of technique can take high frequency detail from the higher zoom lense and crop and stitch this information into the center of the picture that’s more zoomed out. So at 1.5x, the center on the image will contain extra detail, while the edges will be digitally zoomed in from the 1x standard lens. It wouldn’t be perfect, but your subject matter will look sharper and retain some extra detail when compared with single sensor smartphone cameras.

While this sounds simple enough in theory, such an algorithm would be highly processor intensive and would mean much longer times between clicking the shutter and viewing the final image, which is clearly no good for fast action shots or burst modes.

Furthermore, this type of processing would be further complicated by the different sensor pixel sizes and apertures between the dual cameras, which will alter the light capture characteristics. If the zoom camera isn’t capturing enough light, as it typically has smaller pixels, then it will suffer from more noise and would make image stitching a pointless task.

The inclusion of dual cameras is no guarantee of superior quality or better zoom results. This depends heavily on other camera specifications and the particular shot.

Based on the results we’ve seen so far, it’s unlikely that any smartphone OEM has achieved this level of complexity yet. The closest disclosed technology to this would probably be Huawei’s “Hybrid Zoom”, which takes fine detail data from the 20 MP camera and colors it using RGB data from the 12 MP sensor, allowing for superior 2x digital zoom.

In summary, making the most of dual camera potential is much more complicated than it first seems, and it requires a variety of sophisticated processing techniques… not to mention that the results are going to be heavily dependent on the shooting environment.

Wrapping up

Although dual camera technology represents a notable step forward for smartphone photography, we should be aware that there are some major caveats right now. The first being that even dual cameras are still limited to fixed focal lengths and are therefore incapable of offering up the true range of optical zoom capabilities that the marketing might lead us to believe.

That being said, there are notable benefits to this technology over a traditional digital zoom, including superior quality zoom at long distances. You also get the option to enable superior post processing effects, including digital bokeh and advanced HDR. And let’s not forget the creative freedom that these configurations offer photography enthusiasts.

See also:

OnePlus 5 vs Galaxy S8, HTC U11, XZ Premium, Pixel XL, LG G6: What’s the best Android camera?

5 days ago

This technology is still in its infancy, and we’ll no doubt see notable improvements to camera quality and zoom functionality after second-gen products hit the market. Do you highly rate dual camera technologies, or are you happy with your existing single sensor setup?

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Must read: top 10 Android stories

What a crazy week it’s been! The OnePlus 5 launched on Tuesday (in case you missed it), and you can find all the details on specs and pricing right here. We also got the chance to go hands-on with the Moto E4, told you our thoughts on Nokia’s 3310, and much, much more. Here’s the news of the week!

Hey! Pssst! We have tons more OnePlus 5 videos, comparisons, and features for you to check out. You can find it all right here.

Who wants to win a OnePlus 5?

The OnePlus 5 is sleek, fast, and sports an all-new dual-camera setup. Here’s how you can win one!

10 Android stories we handpicked for you

OnePlus 5 review OnePlus is back once again, this time with the new OnePlus 5. Does the “Never Settle” promise live on? We find out in this full review.


Camera shootout: OnePlus 5 vs Galaxy S8, HTC U11, XZ Premium, Pixel XL, LG G6 In this blind camera test, you choose the winner. What’s the best Android camera on the market right now?


Moto E4 hands-on: $70, really? We go hands on with the Moto E4 from Verizon. Considering how cheap this phone is, it’s amazing what $70 will buy these days.


Android O: How is this not Hiroshi Lockheimer messing with us again? Hiroshi Lockheimer is back at it on Twitter. He asked for a vote between three sweet treats: Peanut M&Ms, Milk Chocolate M&Ms, and…Orangina? Android O!


Meet the LG G6 Plus: 6 GB of RAM, 128 GB of storage, and new colors LG has just launched a beefed-up new version of the G6. Dubbed LG G6 Plus (officially styled “LG G6+”), the phone offers more RAM and additional storage space.


What is the Nordic Thingy:52? The Nordic Thingy:52 is a BLE enabled microcontroller development platform for hobbyist and professionals to learn, prototype and develop IoT solutions.


LG’s extended warranty is a good first step towards restoring trust LG is offering US customers a longer 24-month warranty with the new LG G6, but could the company be doing more to restore trust?


A week with the Nokia 3310 reminds me how far smartphones have come My experience with the Nokia 3310 has been a frustrating one so far, and for good reason.


What is the problem with IoT security? The Internet of Things has been in the news recently following the DDOS attack on Dyn. It highlighted the real security problems with IoT. But what is the problem? Let me explain.


What LG needs to do to make the V30 a success We offer our opinions on what LG will need to do to make its next flagship phone, the V30, a success.


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OnePlus 5 International Giveaway!

Welcome to the Sunday Giveaway, the place where we giveaway a new Android phone each and every Sunday!

A big congratulations to last week’s winner of the Google Pixel International Giveaway: Nhkomaiha. (Lebanon).

This week we are giving away a brand new OnePlus 5 courtesy of CaliCase Waterproof Floating Pouches.

Protect your phone this summer with the CaliCase Waterproof floating pouch. Take your phone up to 100 feet underwater thanks to it’s IPX 8 certified waterproof rating. Available in 15 stylish colors including the special edition American Flag edition which is perfect for the upcoming July 4 weekend.

Get $5 off a CaliCase only at CaliCase.com with coupon code: CCSUMMER5

The OnePlus 5 was officially unveiled this week, take a look at our OnePlus 5 review and other top content:

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OnePlus 5 International Giveaway!

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[Report:] Pixel 2 device specifications reportedly leaked

There has been a significant amount of buzz surrounding the next generation of the Google Pixel line, supposedly code-named ‘Taimen’ and’Walleye’ . As we edge closer and closer to that September/October release timeframe, the hype is beginning to build for the successor to the original ‘Google Phone’. With rumors quickly filling the Android enthusiast world with anticipation, we’ve got a report that seems relatively legitimate, detailing potential specifications for Google’s next generation devices.

Google’s ‘Taimen’ device is said to be the bigger of the two options, supposedly sporting a much larger 5.99-inch display compared to last year’s Pixel XL, and with supposedly much smaller bezels, too. The source says this device will use a 1440p OLED panel from LG, and will utilize a Snapdragon 835 processor and 4GB of RAM. There will be a 128GB model available, however the source says it may not be the only option available to consumers. The glass panel on the back of the device is said to make a return, though with the bigger physical size of the device, the source says the glass will no longer encapsulate the fingerprint reader. No dual-camera orientation is said to come to this handset, so don’t get your hopes up for incredible portraiture like we’ve seen in devices like the OnePlus 5.

‘Walleye’ will apparently be a much smaller device, returning to 4.97 inches and maintaining its FHD 1080p resolution, similar to the standard model Pixel of 2016. The source says that this model will look almost identical to the 5-inch Pixel device of yesteryear, but will take advantage of the objectively large bezels to include a set of front-firing speakers. While this is an incredibly welcome addition for many, the source says it includes these at the expense of a 3.5mm headphone jack. This is the specification I find hardest to believe, especially considering the Pixel commercial seen last year, which took a very blatant jab at the iPhone 7’s lack of the port. That being said, anything is possible, and Google very well may have considered it ok to remove the jack as a trade-off with those front-firing speakers. The device is also said to include a Snapdragon 835 and 4GB of RAM like it’s larger sibling, which would make it a very enticing option for those looking for high-end specs in a more palm-able device. The leak mentions a 64GB option available, but we’re assuming Google will probably offer a larger option as well.

So let’s recap on this leak, shall we?

Taimen:

  • 5.99-inch 1440p OLED display
  • Snapdragon 835
  • 4GB RAM
  • Smaller Bezels
  • 128GB Storage option
  • Glass/Metal Back
  • Headphone jack

Walleye:

  • 4.97-inch 1080p FHD display
  • Snapdragon 835
  • 4GB RAM
  • 64GB Storage option
  • Glass/Metal back (Like 2016 Pixel)
  • Stereo speakers
  • No headphone jack

This leak seems to fall in line with the previous rumor that Google has canceled its rumored third Pixel device, codenamed “Muskie”. This leak speculated that the success of larger phones such as the Galaxy S8 and S8 Plus may have swayed Google to reduce their offerings to 5 inches and a larger 6 inch model, which may help customers decide which option is right for them instead of flooding the market with too many screen sizes. This also seems to de-legitimatize the rumor that Google was producing a more budged-friendly device, though the source for the Pixel 2 options above did mention that the larger Taimen device was running “Pixel Imprint” fingerprint software which Walleye was apparently running software labeled “Nexus Imprint”. While Google is certainly unlikely to bring the Nexus back in any shape or form for the foreseeable future, you never know what Google might have up it’s sleeve.

As we edge closer to the speculated September/October release date, be sure to stick around and watch out for any of the latest news and leaks regarding Taimen, Walleye, and more.

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Lenovo Tab 4 can now be pre-ordered from Amazon and Newegg, $129 for 8″ and $179 for 10.1″

Lenovo is one of the few major Android manufacturers still invested in tablets, and the company’s ‘Tab 4’ lineup has been highly anticipated by fans. Both 10.1-inch and 8-inch models have shown up for pre-order online, with the former costing $129 and the latter costing $179.

Both tablets have Snapdragon 425 processors, 2GB of RAM, 16GB of internal storage, and a microSD card slot. They both ship with Android 7.1 out of the box, but considering Lenovo’s track record, don’t expect fast updates.

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Lenovo Tab 4 can now be pre-ordered from Amazon and Newegg, $129 for 8″ and $179 for 10.1″ was written by the awesome team at Android Police.

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