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Mangibu
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Mangibu's Discussions

Binning
1 Reply

I have a question to the Stonyman data sheet “10.5 Binning and reading a binned e.g. downsampled image (STONYMAN ONLY)”:If I use 4x4 blocks then the Stonyman chip is bin down to 28x28 and not 23x23?I…Continue

Started this discussion. Last reply by Geoffrey L. Barrows May 30, 2013.

Stonyman library - calculation of the mask
1 Reply

Hi,I have a question regarding the calculation of the mask (I refer to the Stonyman/Hawksbill vision chip library “ArduEye_SMH.h”).The function calcMask finds the minimum (pixel) value of an image…Continue

Started this discussion. Last reply by Geoffrey L. Barrows Apr 12, 2013.

Range of the output voltage of the Stonyman
9 Replies

Hi,I am using a Stonyman breakout board with a mounted lens together with an Arduino Uno R3.For the connection of the Stonyman to the Arduino board I use an Arduino Proto Shield with an external ADC…Continue

Started this discussion. Last reply by Geoffrey L. Barrows Feb 11, 2013.

ArduEye Aphid
3 Replies

Does anyone know when “ArduEye Aphid” will be available for purchase?Thanks.MichaelContinue

Started this discussion. Last reply by Mangibu Aug 1, 2013.

 

Mangibu's Page

Latest Activity

Mangibu replied to Irene Donati's discussion Stonyman Power consumption/Characterization in subthreshold regime (3.3 V)
"Hi I can’t help you because I have not used the chip with the amplifier and I have no experience with the seetings of the amplifier. I used 5V for the stonyman. It seems to be that there is no support anymore from Centeye (Geoffrey L.…"
Mar 5, 2014
Irene Donati replied to Mangibu's discussion Stonyman Vision Chip - Level shifting
"Hi, i'm also interested in Stonyman's Behaviour when it is operated in sub-threshold regime. Right now we're using Vdd=3.3 V with the amplifier gain set equal to 2 (CONFIG=27) We get a current consumption of 10mA to 12mA. Do you think…"
Mar 4, 2014
Mangibu replied to giacomo parmigiani's discussion MSP430
"Because I have not used the pixel amplifier (if you run the stonyman with 5V you don't need the pixel amplifier) I have also not used the signals INPHI and VREF and therefore I have no experience with this signals. Michael"
Dec 29, 2013
Mangibu replied to giacomo parmigiani's discussion MSP430
"Hi, Please check the following post: http://embeddedeye.com/forum/topics/range-of-the-output-voltage-of-the-stonyman http://embeddedeye.com/forum/topics/stonyman-vision-chip-level-shifting I would recommend to use an external AD-Converter because…"
Dec 29, 2013
Mangibu replied to Mangibu's discussion ArduEye Aphid
"Hi Geoffrey, Are you still working on an Aphid with ARM Cortex M4? If yes, when do you think it will be available? Thanks for your answer. Best regards Michael"
Aug 1, 2013
Geoffrey L. Barrows replied to Mangibu's discussion Binning
"Good catch! Yes, at 4x4 blocks you have 28x28 super pixels, not 23x23. That is a typo to be fixed... You could use 0xEE instead of 0x77 for downsampling by 4x4, however the super pixels would be shifted by a pixel and thus the boundaries between…"
May 30, 2013
Mangibu posted a discussion

Binning

I have a question to the Stonyman data sheet “10.5 Binning and reading a binned e.g. downsampled image (STONYMAN ONLY)”:If I use 4x4 blocks then the Stonyman chip is bin down to 28x28 and not 23x23?I refer to the „ArduEyeSMHClass“, Function setBinning:Why is for example (if I want to downsample by 4) hsw=0xEE and not hsw=0x77?Thanks for helping.MichaelSee More
May 1, 2013
Geoffrey L. Barrows replied to Mangibu's discussion Stonyman library - calculation of the mask
"Yes this calculation is correct. img_a is the image grabbed when the texture is blank. The reason we use mask_base and mask[i] rather than putting everything in mask[i] is that if we first subtract out the base, then we can use just 8-bit values for…"
Apr 12, 2013
Geoffrey L. Barrows replied to Mangibu's discussion Stonyman Vision Chip - Level shifting
"I'd be interested in seeing what you get, if you are willing to share it (openly or closed)."
Apr 12, 2013
Pengyu replied to Mangibu's discussion Stonyman Vision Chip - Level shifting
"Thanks Geof. We are investigating the Stonyman's behavior when it is operated in sub-threshold regime. For example, how the camera behaves when its voltage is below 3V. The sub-threshold operation reduces the camera's power consumption at…"
Apr 12, 2013
Geoffrey L. Barrows replied to Mangibu's discussion Stonyman Vision Chip - Level shifting
"Wow- Thanks for the detail! I took a closer look at the chip schematic and what you report is correct- the chip draws more power with INPHI high. A future chip we are working on will draw less power."
Apr 12, 2013
Pengyu replied to Mangibu's discussion Stonyman Vision Chip - Level shifting
"When we keep selamp=0, set VREF=30, and hold INPHI high, the current consumption of the Stonyman chip is 0.826mA. Then we hold INPHI low and keep the rest the same, the current consumption of the Stonyman chip is 0.71mA. Keeping the camera in reset…"
Apr 1, 2013
Mangibu posted a discussion

Stonyman library - calculation of the mask

Hi,I have a question regarding the calculation of the mask (I refer to the Stonyman/Hawksbill vision chip library “ArduEye_SMH.h”).The function calcMask finds the minimum (pixel) value of an image and subtract it from each pixel of the image. The result is the mask.Code: mask[i] = img[i] - *mask_base; => ("mask_base" is the minimum)The function applyMask applies the mask to an image.Code: img[i] -= mask_base+mask[i];If I rewrite the code (without the short form) I will get: img[i] = img[i] –…See More
Mar 30, 2013
Geoffrey L. Barrows replied to Mangibu's discussion Stonyman Vision Chip - Level shifting
"The amplifier was not designed to be shut off, but it shouldn't draw very much current- probably no more than 100uA. You *might* be able to reduce the current a little as follows: 1) keep selamp = 0 2) set VREF = 63 3) hold INPHI high. I…"
Mar 25, 2013
Pengyu replied to Mangibu's discussion Stonyman Vision Chip - Level shifting
"Hi Geof, The amplifier on the stonyman chip can be bypassed by setting selamp to 0. Is it possible to shut down the amplifier module on the stonyman chip? Thanks. Pengyu"
Mar 25, 2013
Geoffrey L. Barrows replied to Mangibu's discussion Stonyman Vision Chip - Level shifting
"Yes and Yes- though remember that the bias generators generate a SMALLER voltage when given a LARGER number. 0 produces the highest voltage = highest current, while 63 produces the lowest."
Mar 22, 2013

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Technical interest
image sensor chips, vision hardware, image processing, ground robotics, airborne robotics

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