Questions tagged [imageprocessing]

Image processing is any form of signal processing for which the input is an image, such as a photograph or video frame; the output of image processing may be either an image or a set of characteristics or parameters related to the image.

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How are objects rendered with a MEMS mirror for AR?

This question is an intersection of both hardware and software. I am trying to understand the theory of AR technology, but hitting some roadblocks and cannot find any good online resources that talk ...
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Stereo Vision on Raspberry Pi using CSI MUXing

I've been researching this topic for a while and have finally come up with something but I'm looking for advice and I have a couple of questions. The end goal is to put this on a drone and receive ...
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3answers
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Signal processing vs image processing?

Although both are domains of EE, but what are differences between them? I am able to draw following conclusions from wikipedia article of dip and also from some other web reources 1) DIP(Digital ...
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43 views

Interpreting Fourier transform of Images

I'm new to image processing and am learning about the Fourier transform. I've read that FT decomposes a function to its constituent frequencies. However, I'm not sure how to tell which is a low ...
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3answers
79 views

convolution vs correlation?

Apparently this question looks better for DSP SE but I am posting it here to get answer in simple words for those EE graduates who didn't studied signal processing in undergrad. Apparently as far as ...
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0answers
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Discrete Cosine Transform (DCT) Coefficient Distribution

I have two images : Original Image Binarized Image I have applied Discrete Cosine Transform to the two images by dividing the 256x256 image into 8x8 blocks. After, I want to compare their DCT ...
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2answers
770 views

Color binning on Bayer sensor

Is there a difference between doing binning on a Bayer sensor before or after the ADC with respect to spatial information lost? How the debayering works should not matter, Assuming the same method ...
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1answer
19 views

Which are the physical factors that determine the maximum transportable resolution of a cable (for instance: HDMI)?

Which are the physical and electrical factors that determine that an old generation HDMI can transport for instance 1080p resolution, while a new HDMI (2.0) arrives at 4k? Is it due to a different ...
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3answers
2k views

Arduino LCD Display drawing image issue

I am playing with 3,5" (400x240 chinese unknown 8-bit controller driven) TFT display which is placed into Arduino Mega 2560 R3 board. My final goal is taking .raw data from SD card and drawing it on ...
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1answer
82 views

What is the difference between kernel and filter

What is the difference between kernel and filter? (Not for CNN, in general)
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2answers
347 views

AD725: is it dot crawl - and what to do about it?

Device's datasheet says One well known distortion of composite video images is called dot crawl. It shows up as a moving dot pattern at the interface between two areas of different color. It is ...
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1answer
381 views

Using an inertial measurement unit to compute global motion optical flow of video [closed]

I have a camera rigidly mounted together with an IMU that consists of 2-dof gyroscopes and 3-dof accelerometers. My aim is to compute the global optical flow of the image captured by the camera, in ...
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0answers
83 views

Arduino-like microcontroller with more ram for image processing [closed]

I want to build a device to perform image acquisition and processing, but I don't know which kind of board/microcontroller to use. My idea is to use a low-res camera, take a shot, analyze it and ...
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1answer
105 views

How can I determine a resolution of 4:2:2 YCbCr image?

I fetch data from 420 TVL camera, and now I just want to see this image, the only thing I need is resolution to draw it on my screen. How can I determine this? BWP M420MD -- camera, I'm getting DCMI ...
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2answers
59 views

What is image and video signal ?

Signal is something that carries information. Usually, something is a pattern of variations of physical quantity that can be manipulated, stored, or transmitted by a physical processes. I am wondering ...
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1answer
95 views

Why is the Image Sensor Board routing different?

The below posted is a open source camera project Elphel PCB layout images I have took their 353 model camera, which is mounted with an Onsemi sensor I only know that for high speed signals we go ...
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3answers
6k views

Flip the image of OLED 128x64 0.96 inch display

I am looking for a method to flip the image of an OLED 128x64 0.96 inch (with SSD1306 driver) display. It is the one I have with 4 pins only (image found on Internet): What I want to do is: Are ...
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2answers
274 views

X-ray back-projection for conversion to hard-field magnetic induction tomography?

This is a question about hard-field back-projection as used in x-ray tomography, applied magnetic induction tomography (MIT). Al-Zeibak and Saunders (A feasibility study of in vivo electromagnetic ...
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0answers
563 views

Interfacing with MIPI CSI-2 camera sensors like the Omnivision OV2732?

CSI-2 is used in pretty much every smartphone however I'm struggling to find much information on how most companies receive and control CSI-2 sensors. I understand there are NDAs. This is not for a ...
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4answers
176 views

brightness algorithm for VHDL [closed]

Hi I am working on an image processing project in which I try to change brightness of a pixel. The code I wrote works but not in the way I want it to be. Here is the code segment I use to change ...
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1answer
158 views

efficiency and speed in image processing with FPGA

Hi I have been writing a code in VHDL for some image processing. However, due to some reasons I have not yet determined the sythesis does not stop. I suspect that efficiency of the code is not as much ...
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1answer
59 views

What type of sensors are these? [closed]

I saw this sensors in an YouTube video where these things were glued to Glenn Maxwell's dress and his whole movement was monitored for the making of a cricket game.
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2answers
1k views

Opening and reading pixel values from bitmap images in Modelsim

How do I open a bitmap image, read the pixel data (24 bits) and store it in a memory that I created in a Verilog module in ModelSim? How do I open the below image in Modelsim? Is it possible in the ...
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2answers
531 views

Video compression using low power processor

I'm trying to build a hand held camera with video recording feature. Basic features of camera are Resolution: 640x480 Frame rate: 25/30Hz Video format from sensor: 8-bit grey scale BT.656 (Sensor ...
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1answer
50 views

Extract a motion filter using camera movement in number of pixel and angle, in VHDL or Verilog

I have read some papers about the topic and searched some MATLAB algorithm. There is one called 'fspecial' in MATLAB. And it could return a Motion filter, when motion is given in number of pixel and ...
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302 views

Rolling shutter effect simulation on matlab

Hi I'm doing a simulation of the rolling shutter effect on matlab, in this case the image of the propeller is distorted, and I tried use a DC motor to simulate the plane's engine at home and filmed ...
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2answers
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What does Burst-size of a SDRAM means? [closed]

I am currently working with real-time image processing in FGPA. I have some timing problems about the classical FFT algorithm. i.e : FFT of one images spends more time than one frame period time. I ...
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1answer
202 views

Image reading in FPGA

I'm a newbie to FPGA stuffs and I'm using Zybo board.I need to read image stored in a hex file by FPGA and save the processed result in a hex file again. How can I implement this? How can I connect ...
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261 views

How to find Z Transform of the function which is on S domain?

Given a $s$ domain function $$F(s)=\frac{3\, e^{-0.2s}+3}{s(s+3)}$$ and i have to find the Z-Transform of the function for (1)T=0.1 sec (2) T=0.3 sec For T=0.1 sec i can write $$ 3(e^{-0.2s}+1)\...
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1answer
115 views

designing image debayer block, how should the testbench be written

A debayer block inputs image from a CCD Bayer filter and then estimates the missing color information for each pixel. The data comes from a camera. How should one go about writing a testbench for ...
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2answers
326 views

Load image into VHDL testbench

Is there a standard way to load an image into VHDL testbench so image processing logic output can be tested? Obviously there will be an output from the testbench, also an image that must be possible ...
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1answer
822 views

Image sample rate

How to understand sample rate in case of images, it is clear to me when we are talking about the audio, but how these two are related? Is it more complex than the audio sampling?
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1answer
571 views

Why FPGA is being used on VR (Virtual Reality) devices? [closed]

I have seen a number of data sheets of VR devices and many are being powered by FPGAs. Is there any specific reason for this? Why not to use an ASIC or a simple CPU, embedded processor or whatever? ...
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1answer
704 views

how to count number of white pixels in a binary image using xilinx system generator

After doing certain pre processing on image serialized image will be obtained. Once we do thresh holding binary image will be displayed. How do I count the number of white pixels in a binary image ...
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1answer
88 views

Is it possible to take a picture from a paper with infrared image sensor without lighting? [closed]

I'm going to make a device which will take a picture from a paper which contains a line of English characters and then process the picture with OCR to get some information in micro-controller. My idea ...
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5answers
457 views

M.S. Math to Engineering Ph.D : Mathematics in Electrical Engineering [closed]

I have two Bachelor's degrees. One is electrical engineering and the other one is mathematics. I am studying mathematics (partial differential equations) in the graduate school (Master course) now. ...
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1answer
3k views

Raw RGB from CMOS image sensor to grayscale conversion

I am trying to produce an image with OV7740 color image sensor. As far as I know, the sensor is configured by default to provide 10bit parallel RAW RGB data (due to an on-chip Bayer filter). How ...
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1answer
75 views

What type of processor will I need to control a mobile front camera? [closed]

I have a mobile front camera (like this one). I want to build a wearable camera out of it (like this one). However I want to make this from scratch and not have to resort to using a Raspberry Pi. ...
4
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3answers
4k views

Good FPGA / Microcontroller development board for real time image processing [closed]

I have been working with OpenCV on Desktop environment for the past one year and now I want to shift to dedicated hardware for my real time image processing applications. I have the following ...
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1answer
59 views

In an RGB scene, why can we assume color difference images are band-limited?

A common assumption in image processing is that the difference between two color channels of the same scene are band-limited. For instance, the interpolation method used in Hirakawa's paper ...
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2answers
2k views

Open a picture and read its Pixel Values

I want to calculate the Histogram of an Image is grayscale color mode I have designed a memory and a Calculator of Histogram value, now I want to get Pixel values and put them in Calculator as Input ...
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1answer
1k views

JPEG compression on Cortex M4

Is it possible to perform JPEG compression on a Cortex-M4 MCU? Are there existing libraries that can do this and can accept a 10-bit RAW RGB?
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1answer
503 views

nrf24 bluetooth image transfer

I'm trying to build "arducam-bluetooth-module-wireless-image-system" using an NRF24L01. I wish to have a long range transfer of a single image from a remote location to my Android phone whenever it ...
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1answer
150 views

Arduino/IC Picture Scanner [duplicate]

For a project I am working on, I need some kind of way for a micro-controller (preferably Arduino, since I have background knowledge) to identify a certain symbol on a piece of paper (e.g. recognising ...
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1answer
184 views

Interface 10 image sensors to Linux CPU

I need to process image data from 10 image sensors simultaneously (namely from OnSemi MT9V022s or similar). All 10 sensors will be externally triggered by a common signal. Ideal solution would be to ...
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1answer
68 views

Analyse images before storing them in memory [closed]

Physicist here, so please be gentle ;-) I am designing a device to acquire in a few seconds a large amounts of images (a few terabytes), that then need to be analysed, possibly on the fly. Is there a ...
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1answer
50 views

What are my options for a processor to fulfill the requirement of a video signal processing application? [closed]

I 'm a collage student and I 'm designing an embedded system of a smart camera for traffic surveillance as my graduation bachelor project. The camera does the following: Monitors a traffic lane with ...
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2answers
83 views

Using CMOS to detect transmittance in sample from LEDs

I am trying to get the transmittance through various liquid samples using specific wavelength LEDs. Originally I was experimenting with photodiodes, but do not seem to be ideal. The target color ...
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3answers
5k views

jpeg images in STM32 internal flash

I'm using both STM32F103 and STM32F407 with a SEPS525 SPI driven OLED display (160x128). I want to store images to display in internal flash, but BMP uncompressed images with 16bit colors are huge (...
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3answers
2k views

Transmitting data from MATLAB to FPGA

This is about design of a JPEG compression/decompression scheme on an Altera FPGA. It is possible to have camera or SD card for image input and TV or SD card for image output. However, these ...