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Questions tagged [ycbcr]

19 questions
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4 answers

Function to convert YCbCr to RGB?

I have Y, Cb and Cr values, each with a size of 8 bits. What would be a simple C function which can convert these values to R,G,B (each with a size of 8 bits)? Here is a prototype of the function I am looking for: void convertYCbCrToRGB( …
SunnyShah
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How can I generate the faces of a YCbCr cube in VB.NET

I have written a program in VB.NET to generate just one face of a YCbCr colour space cube. I want the final image to look similar to the CbCr plane at constant luma on Wikipedia (where Y=1). Ultimately, I want to create images of all 6 faces of the…
Drummy
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I can't get vImage (Accelerate Framework) to convert 420Yp8_Cb8_Cr8 (planar) to ARGB8888

I'm trying to convert Planar YpCbCr to RGBA and it's failing with error kvImageRoiLargerThanInputBuffer. I tried two different ways. Here're some code snippets. Note 'thumbnail_buffers + 1' and 'thumbnail_buffers + 2' have width and height half of…
Mustang
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How to save Ycbcr numpy array to an image without changing its array points?

I had an rgb image which I converted into Ycbcr array. rgb = cv2.imread(image) r,g,b = cv2.split(rgb) def ycbcr(r, g, b): y = .299*r + .587*g + .114*b cb = 128 -.168736*r -.331364*g + .5*b cr = 128 +.5*r - .418688*g - .081312*b …
Iamnotperfect
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How to convert Y Cb Cr to RGB in MATLAB manually?

I've been tasked with performing a 4:2:0 chroma subsampling (color compression) on a series of JPEGs. The first step is to ensure that I can generate my Y, Cb, and Cr values and then convert back to RGB and display the image. Then I can go back…
Jared Boyd
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1 answer

python "can't assign to comparison" error

I want single YCbCr-channels that are smaller or bigger that 128 of a picture set to 0. But I keep getting the error "can't assign to comparison" and I don't really know what I am doing wrong. This is the code: def calc_coloursplash(image_data,…
ryanmitchell
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How can i convert YCbCr to BGR24 using ImageISharp

I get an image in IntPtr or an array of bytes in the YUV420 color space. How can I use ImageSharp to convert an image to BGR4 color space? I can't find conversion examples anywhere with imageSharp . Therefore I use other library for conversion. But…
zerpico
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Increasing the Y value in a YCbCr image in Python (pillow) results desaturated image

I'm using the code below to convert from/to RGB/YCbCr images, which works properly when I don't do any adjustment over Y values. def rgb2ycbcr(im): xform = np.array([[.299, .587, .114], [-.1687, -.3313, .5], [.5, -.4187, -.0813]]) ycbcr =…
Yusuf Kürşat Tuncel
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Python - White balance check on a YCbCr image

long-time reader first-time poster. I do test engineering for medical cameras and I was curious if there was a way to check if a YCbCr image was white balanced using python code. I know there are multiple options to perform white balance but I'm…
Tamjid Munir
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What is the best way to display each ycbcr channel of an image separately in Python with numpy, scipy, skimage etc?

UPDATED:This function is supposed to take in an ndarray (eg, one obtained from pyplot.imread()) and display each YCbCr channel separately: import numpy as np import matplotlib.pyplot as plt from skimage import color def plot_ycbcr(a): b =…
aimlesslegs
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OV7670: Why does the test pattern work, but the colors of a picture are wrong?

I am working with the OV7670 camera module connected to an FPGA (Cyclone V DE0-CV board). When outputting the 8-bar color bar test pattern, everything is fine. To output the test pattern, register 0x71 is set to 0xB5. When trying to output an…
Jokkefar
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Matlab: Save image frames as YCbCr video

So I have 10 separate image frames of YCbCr format. How can I export it as a YCbCr video in Matlab so that it can be viewed through a supported video player? Update-1 for Frame_Index = 1: frames YCbCr_Movie_Structure_Array(Frame_Index).cdata =…
user4282023
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1 answer

Finding the colour that matches one from a given palette

I have a palette of colours, that's either 32 or 256. Then I have a stream of incoming colours (in RGB). I want to find out which colour in the palette the incoming colour matches most closely with. I believe this sort of algorithm is used in many…
Raze
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Why converting BGR to YCbCr in OpenCV inherit different value compared to manually counting it using equation?

I tried to check whether my image conversion have the same RGB value as manually converting using RGB to YCbCr equation. Using python : import cv2 import numpy as np file_src='rgb_color.bmp' //input image file_dst='ycbcr_color.bmp' //output…
BronzeCoin
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How to correctly read an image in YCbCr mode?

How do I know if I have read an PNG image in YCbCr mode correctly? I'm getting different pixel values which is confusing. def convert_rgb_to_ycbcr(img): y = 16. + (64.738 * img[:, :, 0] + 129.057 * img[:, :, 1] + 25.064 * img[:, :, 2]) / 255. …
Steven Chen
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