OpenMV

kwiley

When you say the red and blue value is always the same, do you mean for every pixel in the image (which would imply a bug that should be fixed), or for some particular pixel or set of pixels? Sounds like you're looking at the green pixels of the Bayer matrix. When you say you want the RAW value of a...

kwiley

I fully understand the challenge of writing, much less maintaining, documentation. That's why I'm offering to contribute.

kwiley

I write thorough questions to avoid responses of the "go read the docs" variety. If the docs are confusing, or even potentially inconsistent, I ask clarifying questions. I suppose that since I'm still ramping up on building the firmware (I think may have succeeded actually, I need to run some tests)...

kwiley

It looks like the H7 is speced to draw a little less power than the M7: (idle-no-card/idle-w-card/active-no-card/active-w-card) 110/110/190/200 for the M7 and 110/110/160/170 for the H7. Is that correct? The LCD shield is speced to draw (idle-light-off/idle-light-on/active-light-off/active-light-on)...

kwiley

I have a global shutter module. I have got to put that thing on my H7 and fire it up. I haven't even used it once yet.

kwiley

I know this is an old discussion, but I was just going through forums looking at past threads and found this one. Flat field correction is not performed with image differencing, although dark current correction is. To correct a flat field, you need division. But, I took a glance at the docs and see ...

kwiley

Whoa, so I actually did understand you correctly. I just couldn't believe it. All right. Thanks a bunch!

kwiley

Okay, that explains why the IDE shows a deBayered preview. Thanks. I'm not going to say I really understood the rest of the reply quite yet, but I don't want to be a burden about it. I'm not sure what "processed bayer" is. The only processing I can imagine one would do to Bayer data is demosaicing t...

kwiley

I have two questions about the BAYER format. First, assuming I set the frame size to full res so there is no downsampling, VGA in my case (this is on an H7), it seems to me that the IDE's preview should be a grayscale image showing a quincunx of illumination pixels for green and two quarter patterns...

kwiley

Interesting. It isn't an important issue, but this isn't about reformatting the card. Something is reverting the name after I rename it. Could be OpenMV, could be the desktop. It's okay. Thanks.

kwiley

Sorry. I didn't mean to be challenging. It was just trying to nail down the things that weren't clear to me yet. Thanks to both of you for all the information. I'll try some other cards and see how it goes.

kwiley

I tried reformatting it as exFAT and it still didn't work in either camera (M7/H7). I'll buy another card, but At 32GB, they aren't so cheap that I want to buy hoards of them in a random search for something that works. I don't mind that they might or might not work. I just wish it was clear what *s...

kwiley

Okay, so long as I don't have a defective unit. That was one concern of mine. If it's systemic to the design and you're already aware of it, then don't worry about it. Thank you for the various suggestions. I'll mix them all into an eventual solution.

Cheers!

kwiley

Any idea why the SD card reverts its name to NO NAME after you change it on the desktop? Just curious. It's easier to keep track of multiple cameras attached at once if their volumes have distinct names.

kwiley

I'm on Mac, not Windows, but if you're asking if I can mount the drive on my Mac, yes, it comes up just fine. What about the class 10 status of the card? Do you know that class 10 cards work or do you recommend a different class perhaps? What class 32GB cards do you have at your disposal for testing...

kwiley

I appreciate you theorizing as the problem, but are you saying I have discovered this issue a year after the H7's release and there is next to no discussion about it on the boards? I can't be the first person to run up against this. How do you deal with this exact same issue on your own H7s, of whic...

kwiley

Ah. No worries. I'll probably end up buying the shield anyway, just to support the project. It's just that I have all these little 8266s lying around anyway, so I'm looking for ways to leverage them.

Thanks again.

kwiley

Are you saying without your upcoming library it is impossible for me to do it on my own? I figured I could send data from the M7/H7 to the ESP board (whatever one I use) over a serial connection.

kwiley

If I turn on the IR LEDs on my H7 (default sensor and lens), the live preview image in the IDE loses practically all contrast. It's a wash of gray showing just the barest ghost of an image of the scene (if I point at literal lights or the computer screen, the image comes through, although washed out...

kwiley

I have a 32GB SD card that isn't "bad" or dead. I can mount it on my desktop. I formatted it as MS-DOS (FAT32) because that was the format of an 8GB card I have that works fine in two different OpenMV cameras. But the 32GB card never mounts on either camera. Any ideas what the problem might be? I do...

kwiley

I assumed the filters were built over the sensors, not inside the lenses. I'll look into that. Thanks.

kwiley

I don't mind buying the WIFI shield, but I do happen to have a smattering of WIFI devices lying around the house already, namely multiple ESP8266 based boards and one ESP32 based board, and it would be nice to make use of stuff I already have. I'm tempted to attached one of the ESP8266 boards to an ...

kwiley

I realize the built-in IR LEDs are 840nm, which is why we can see them, and I'm fine with the fact that the default included sensor is likely less sensitive to 940nm, but for discreteness, say in a security camera illuminating your porch, you don't necessarily want a visible light on all night long,...

kwiley

Thank you.

kwiley

There's a pretty significant evolution in Tensorflow going on right about now, pertaining to the release of Tensorflow 2. I'm curious if I will be able to run a model trained on TF 2 on OpenMV or if the OpenMV TF development is currently targeting TF in a way that is exclusive to models generated wi...

kwiley

So, this is all experimental for me. I only just started working with two OpenMVs at the same time this week. The intent is to create a hybrid two-cam system, perhaps connected through SPI for central coordination, in which the cams would do slightly different things. For example, one might object-t...

kwiley

Thanks. I'll look into those features.

kwiley

I would like to run my M7 and H7 simultaneously, presumably from completely independent instances of the IDE, but if I try to run a second copy, it just refocuses on the first running copy. I've never had this problem before. Usually it's pretty easy to run an application multiple times, or run comp...

kwiley

I like optical flow for applications like this. Unlike frame differencing, OF will actually give you the direction and speed of the moving objects in addition to their mere detection. OF is built into the OpenMV APIs I believe. Just dig through the examples some.

kwiley

Excellent. Thanks for clarifying that.

kwiley

I haven't had any trouble with my M7 or H7 on my Mac. Just to confirm, I plugged it in a second ago, and sure enough, the drive popped up on my desktop, mounted and ready to go. I can also interact with it through the IDE. Lastly, I can see it listed under /dev and I can initiate a REPL session via ...

kwiley

I worked with the Pololu SV203 for years. I have about eight of them lying around my house now and have always thought about incorporating them into more recent projects, but like you, I have had to consider how I would interface them. As indicated above, it'll depend on getting a serial connection ...

kwiley

There are tensorflow projects for human detection and estimation. Isn't there talk of running TF models on OpenMV? Is it true that we should be able to run essentially any model trained offline on an H7 (module storage constraints of course)?

https://github.com/eldar/pose-tensorflow

kwiley

On the whole color debate above, one very application-specific approach would be to record Bayer filter data (i.e., raw sensor data) straight onto the SD card, such that it could be deBayered and processed at a later time. In such a way, one could use a global shutter to record high framerate color ...

kwiley

Ah, I see. It's some cross-platform wrapper around QT. I'm not familiar with that approach to application design. I should really try to jump in here at some point to see if I can help out some.

kwiley

Well, it's built into the app. The Finder pulls that information from a Mac application's package assets. I haven't dived into the source for either the camera or the IDE yet, but I can take a look at it when I get a chance. How is the IDE written? I presume it is a native Cocoa application, right? ...

kwiley

If you Get Info on the application, it says v4.0. I just noticed that if I go ahead and run it anyway, the app says it's v2.2.0 in the About box. So, it's just the Info box from the Finder that shows 4.

kwiley

The IDE on my Mac from Dec. 2018 is v4.0, but the version available for download is v2.2.0, although surely far more recent. This isn't very important, but may I ask the rationale behind the version numbering for the IDE?

kwiley

Ha. Okay, I understand. I'm happy to do it the right way. I just wanted to check before I started soldering. It makes particular sense for me to do it that way since I intend to mount the M7 and H7 next to one another, so it will be easier if they are configured the same way.

Cheers!

kwiley

My H7 and global shutter have arrived. Woo hoo! I see the H7 doesn't come with the headers presoldered, and in fact comes with both a set of one-sided-male and two-sided-male-female headers. The M7 I already have came with the two-sided headers only, and presoldered at that with female pointing out ...

kwiley

I'm familiar with the exposure trade off and gamma corrective measures. I was experimenting with a 3500 fps camera recently. Thanks.

kwiley

I'm looking forward to the imminent arrival of my H7 and global shutter. Color is not at all important to me (well, that's overstating it -- given unlimited resources, I would happily *accept* color, haha). My question is about the theoretical 200fps framerate. Do the higher framerates require downs...

kwiley

Thanks. That's what I expected.

kwiley

Ah, okay. Thanks.

kwiley

I'm curious if there are any technical differences between the servo shield and the PCA9685, found many places online, such as (chosen for no particular reason) https://www.amazon.com/HiLetgo-PCA9685-Channel-12-Bit-Arduino/dp/B01D1D0CX2 . The shield fits nicely onto the OpenMV board profile, and tha...

kwiley

Yes, I noticed the comment about the ADC/DAC line, but serial comms would be over the UART lines. I take your point though. Thanks.

kwiley

I see that OpenMV is described as 5V tolerant but 3.3V nominal. Since TTL detects high voltage as anything above 2V, does this imply that OpenMV should communicate over serial just fine in both directions with a 5V device? Assuming the messages would actually get through in both directions (I'm mild...

kwiley

If I'm understanding the pinouts correctly, the LCD shield should work with the servo shield, which relies exclusively on the I2C pins P4 and P5, but not the pan & tilt shield, which utilizes the servo pins P7, P8, and P9, which would double up on the LCD's use of P7 and P8, right? As a follow-up, w...

kwiley

Are we able to achieve a relatively flat gamma curve? Flat gamma, while often not pleasing to the eye, is very helpful in analysis.

kwiley

I already inquired about adding a global shutter module to my H7 preorder. I hope it all goes smoothly.

My initial project with the M7 has gone well, but I need more juice.

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