INTRODUCTION TO CAMERA LENS AND IMAGE QUALITY TESTING
- 1. INTRODUCTION TO CAMERA LENS AND IMAGE QUALITY TESTING
- 2. CONTENTS CAMERA WORKING AND DATA FLOW THE LENS AND TYPE OF LENSES EXPOSURE TRIANGLE APERTURE SHUTTER ISO CAMERA IQ TESTING PROCESS CAMERA ADB COMMANDS AND INPUT KEY EVENTS
- 3. CAMERA WORKING Camera is one of the key subsystems in smartphones Basic things in camera are Lens, Aperture, Shutter and Sensor 3
- 5. THE LENS Main Purpose of Lens is Focus the image and Magnification. Lenses are classified by their focal length Types of Camera Lens a) Normal lenses b) Macro lenses c) Long or Telephoto lenses d) Wide angle lenses e) Zoom lenses 5
- 6. NORMAL LENSES Normal lenses have an angle of view which is roughly the same as the angle that the human eye can comfortably Normal lenses is one with a mid-rang focal length, typically around 50mm Normal lenses have a fixed focal length and wide aperture 6
- 7. MACRO LENSES A macro lens is one designed especially for close-up photography. They produce some really eye A normal-focal-length macro lens (50 mm on a 35 mm) 7
- 8. LONG OR TELEPHOTO LENSES Telephoto lenses compress space They make things look like they are closer together. They make backgrounds bigger. They are also known as portrait lenses Long lenses have a focal length above 80mm 8
- 9. WIDE ANGLE LENSES Wide angle lenses spread out space. They make things look further apart. They make backgrounds look smaller. Long lenses have a focal length that is 10mm to 35mm They have short lenses and good for landscape shot Extreme wide angle lenses are known as fisheye lens because these can capture around 180 degrees 9
- 10. ZOOM LENSES Zoom lenses have variable focal lengths You can set it to different focal lengths 10
- 11. EXPOSURE 11 Exposure is one of the most critical elements of photography. There are three adjustable elements that control the exposure: • APERTURE. • SHUTTER SPEED. • ISO.
- 12. APERTURES It is like Pupil in our eyes They control the intensity of light it controls how much light is being passed onto the camera's sensor. Aperture number are called F-stop and means Fraction. Bigger Aperture =More light and Smaller Aperture =Less light 12
- 13. APERTURES Aperture control the DOF (Depth of Filed) DOF :How much of your photo is in focus Wide angle lenses- Long DOF Tele lenses – Short DOF 13
- 14. SHUTTERS Shutters function like an eye lid. They control how long light enters a camera. Shutter speeds are fractions of a second. Fast shutter speeds such as 250, 500, or 1000 are good for action shots. Slow shutter speeds such as 1,2, or 4 are good for low light pictures and pictures where water looks soft and like cotton. 14
- 15. ISO ISO simply stands for the International Organization of Standardization ISO measures the sensitivity of the image sensor. A higher ISO typically translates to a noisy or “grainy” image. A lower ISO won’t just make less noise, and Capture better colour and dynamic range 15
- 18. CAMERA ADB COMMANDS 18 adb shell monkey -p your.package.name -v 500 adb shell screencap/sdcard/screen.png adb shell screenrecord /sdcard/demo.mp4
- 20. Thank you