Hacking images on windows phone

Hacking Images on Windows PhoneBUILDING WORLD'S MOST ADVANCED APPS

Conducted By RAHAT YASIR ANINDO

Overview Why Imaging app? Basic about Images Imaging app in Windows Phone Camera API’s of Windows Phone Imaging Filters Dual Capturing in Lumia 1020 Nokia Imaging SDK Sharing Imaging App Ideas

Imaging Apps are Every Where!

92%User take Photo or Video with their Smart Phone


49%User say Camera functionality is an important purchase factor


66%User take Photos or Videos with their Smart Phones weekly or more


78%User own a digital camera

Basic about Images

Image ! What is This?

Matrix Representation of an Image

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Visual image formation-Digital Version

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3D object

Digital Camera

Digitizer 2D Digital ImageCCD / CMOS

sensor Lens

Sampling and Quantization, 2D Case

10

Continuous Sampled

f(0,0) f(0,1)

f(N-1,M-1)

Image Sub-sampling-Gray 11

Image Re-sampling 12

Windows Phone Camera Basics

We can build a camera application that can capture still photos. We can query device camera capabilities (where there are multiple cameras on the

device (front and/or rear), where it has flash, etc.). We can get raw camera frames and process them ourselves (encode/decode). We can programmatically set flash and focus when taking a photo. We can change the resolution of the photo. We can continue using the hardware button for the camera shutter to capture a photo

and for auto-focus when taking shots outside our application. A camera need not be present (for example, front facing camera was not a part of the

original devices). Your application would need to handle that condition gracefully. To allow our application to have access to the camera capability, you need to specify

ID_CAP_ISV_CAMERA in our application manifest file. To allow our application to have access to a front facing camera (if one exists), we

need to specify ID_HW_FRONTCAMERA in our application manifest file.

Code to Capture images on Windows Phoneusing Microsoft.Phone.Tasks;using Microsoft.Phone;private CameraCaptureTask ccTask;public MainPage() { InitializeComponent(); ccTask = new CameraCaptureTask();}private void btnCamera_Click(object sender, RoutedEventArgs e) { ccTask.Show(); }

Code to Capture images on Windows Phone

using Microsoft.Devices;using Microsoft.Xna.Framework.Media;PhotoCamera myCamera;MediaLibrary mediaLibrary;public MainPage() { InitializeComponent(); mediaLibrary = new MediaLibrary();

}private void buttonStartCamera_Click(object sender, RoutedEventArgs e) { myCamera = new Microsoft.Devices.PhotoCamera(CameraType.Primary); myCamera.CaptureCompleted += new EventHandler<CameraOperationCompletedEventArgs>(camera_CaptureCompleted); myCamera.CaptureImageAvailable += new EventHandler<Microsoft.Devices.ContentReadyEventArgs>(camera_CaptureImageAvailable); viewfinderBrush.SetSource(myCamera); }

Code to Preview images on Windows Phoneprivate void ccTaskCompleted(object sender, PhotoResult pr) { byte[] imgLocal; if (pr.ChosenPhoto != null) { imgLocal = new byte[(int)pr.ChosenPhoto.Length]; pr.ChosenPhoto.Read(imgLocal, 0, imgLocal.Length); pr.ChosenPhoto.Seek(0, System.IO.SeekOrigin.Begin); var bitmapImage = PictureDecoder.DecodeJpeg(pr.ChosenPhoto); this.imgCaptured.Source = bitmapImage; } }

Windows phone camera API’s

Windows phone camera API’s

Point Processes: Increase Brightness

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256,255

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index. band the is and 3210 ,,kg

Point Processes: Decrease Brightness

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Point Processes: Increase Contrast

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321 ,,k

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Point Processes: Decrease Contrast

.3,2,10.10

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ka

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and where

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23Average filter, Example 1

24Average filter, Example 2

Beauty Mirror App of IOS

25

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Histogram

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k MNnnk

k 10 Lk

Image Pixel Intensity Histogram

1 1 3 3 71 1 3 3 51 0 3 3 20 0 2 2 20 0 2 2 2

0 4321 5 76r

nk

0

2

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r 0 1 2 3 4 5 6 7

nk 5 5 7 6 0 1 0 1

26

There is one histo-gram per color bandR, G, & B. Luminosity histogram is from 1 band = (R+G+B)/3

RIh

GIh

BIh

LIh

Luminosity

The Histogram of a Color Image

27Edge Detection Examples: Original Images

28Edge Detection Examples: Vertical Difference

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29Edge Detection Examples: Horizontal Difference

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30

010141010 Edge Detection Examples: H + V

Diff.

Sharing Imaging App Ideas

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Hacking images on windows phone