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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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64 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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0answers
34 views

Finding the memory polynomial model coefficients

I want to build a memory polynomial model given that I know the corresponding output signals for known input signals. What is the easiest way to find the coefficients of it? And how do we take the ...
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1answer
77 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
53 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
86 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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0answers
364 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
130 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 ...
0
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1answer
96 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
58 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
565 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
317 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 ...
0
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1answer
44 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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0answers
219 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
1k views

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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0answers
41 views

Sobel Edge Detection - estimating possible memory requirements

I'm looking into doing Sobel Edge detection on a FPGA. I'm interested in the memory requirements of the output of the Sobel edge detection. I'm trying to do Sobel edge detection on 250x250 pictures. ...
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0answers
295 views

Image processing using a CC1350 MCU

I'm doing a project making a miniature battery-powered wireless camera.The camera has a resolution of 250x250 pixels, with 10b per pixel-->generating 625kb =78,125kB per frame. The image data is sent ...
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0answers
223 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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2answers
245 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
91 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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1answer
571 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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2answers
244 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 ...
0
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1answer
437 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
82 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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1answer
186 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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3answers
3k 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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0answers
50 views

What sensors could augment image sensors and accelerate time of detecting basketball 100 feet away?

The goal is to detect and track the movement of a basketball from ~100 feet away. Computer vision can do this, but it's computationally expensive. Could other sensors augment image sensors and ...
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1answer
67 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. ...
0
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1answer
58 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 ...
3
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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
957 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
416 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 ...
0
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1answer
144 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 ...
0
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1answer
166 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
67 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
47 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
76 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 ...
3
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3answers
373 views

Scanning/photocopying vs. photographing the material

Why do scanners and photocopies scan the material? Couldn't they just have a digital camera + light behind the glass? A lens with fixed focus would suffice, since the sheet of paper would always be ...
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2answers
78 views

What sizes are detectable from 1m using a fairly good cmos camera?

I haven't ordered a CMOS camera module yet, but I am planning to use it to detect a small object from ~1-1.5 meters. Just too be specific, say I am using the following CMOS camera (although if you ...
0
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3answers
1k 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 ...
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1answer
87 views

Does JPEG compression is lossy or not? [closed]

As I know, generally, the JPEG is consist of DCT, Q ,Huff. But I'm not sure which one is lossy? all of them? of just Q? I think Q is lossy but else not. I just want to know that.
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1answer
427 views

How fast cpu clock do you need to control camera?

I'm making a camera system with CMOS image sensor and micro controller. But I don't know yet how fast cpu clock I need. Assuming that I use 5MP cmos image sensor and take just still image with 1fps, ...
3
votes
1answer
54 views

Whether phase congruency and phase coherence terms are same or different?

I am studying the importance of phase in signal.Can anybody explain what is phase congruency ? Also,I am confused between terms i.e. phase congruency and phase coherence. Whether phase congruency and ...
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1answer
620 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
47 views

Need to use decoded image as reference image, not original. Why?

I'm trying to review the P frame. but I don't understand this "Why not we use original image instead decoded image to P-frame?"
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5answers
2k views

How to convert an array of pixels to jpg or png?

I am doing image processing project in VHDL. And as output am getting array of pixels (32 bit each). I want test this output data visually, for that it must be converted to image either png or jpg or ...
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1answer
931 views

How a decoded picture is stored in a memory? [closed]

If we decode an image (any format) we will get matrix of pixels. For example consider a picture with resolution 10x10 and colour depth of 16777216. Therefore pixel is represented by 24 (888 RGB) bit ...
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2answers
14k views

What is Subsampling in image processing?

I was going through some image processing document. And I came cross this term "sub sampling". What does it mean? Is it sampling again already sampled data .. ?
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1answer
56 views

What is “Configurable clipping rectangles”?

I was going through the features of one Graphics accelerator-IP core. And one important feature of this graphics accelerator is "configurable clipping rectangle". Can any one help me to under stand ...
2
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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
846 views

ARM Processor or FPGA to video signal processing? [closed]

I want to design a PCB where a video camera will take images and they will be shown in a display HD. So I have several questions in order to achieve it: I would like to know what is the best option ...