Digital Camera Memory Card
Presently memory cards are available in large sizes. Most commonly found cards are of 4 gigabyte and eight gigabyte cards. However, 16 gigabyte and thirty-two gigabyte cards are also available in few types of memory-card. Memory cards of larger sizes can easily save more than 1,000 pictures.
Image Sensor
- Digital camera memory card starts with the digital camera's image sensor. The light falls on the sensor first and then passes through an analog-to-digital converter. The quantity of data secure depends on the sensor resolution. The higher the resolution more the data captured.
Camera’s Internal Memory
- As soon as the data is transformed into a digital mode it is saved in the internal memory of the camera. Originally the image is saved in the memory buffer because saving data to the buffer is faster than saving it in the memory card. This enables the camera to take more pictures faster.
Memory Card
- What is basically a memory card? It is a storage device which is in a solid form. Memory cards do not have any other movable parts and is much more reliable as compared to mechanical hard disks. Memory cards are non- volatile devices In other words, the data stored in the card even remains in it when the card is plugged out of the camera.
- Another name for non-volatile memory is “flash memory”. It is a type electronically erasable programmable read-only memory (EEPROM) and comprises of a grid of very small memory cells that contain 2 transistors. These 2 transistors transform in the form of very thin oxide layer to either positive or negative, as a result storing the 0 or 1 state of the binary digital data.
- Sometimes, 8 bits are required to save 1 pixel of image content. Therefore, 8 memory cells are needed to save that one pixel. Similarly, if a digital image is captured with a ten megapixel camera, eighty million memory cells will be needed.
- In order to capture 100 images one gigabyte memory card will be needed having 8 billion memory cell .
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