Device and method for correcting digital image data distortion
A digital data and image technology, applied in the field of distortion correction devices, can solve the problems of slow memory access speed, memory access bandwidth, impact on overall system size and manufacturing cost, and inability to set up
Active Publication Date: 2017-05-10
OMNIVISION TECH INC
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[0005] In existing digital imaging systems, errors caused by lens distortion can be corrected by signal processing using an image signal processor (ISP), which is usually formed on a semiconductor chip and receives images from The digital image data of the sensor (which is usually also formed on a semiconductor chip); in order to correct the distorted digital image data, a large-capacity buffer memory is usually required to store hundreds of lines of the distorted image data; due to the The memory capacity of the chip is very large, usually requiring millions of bits, so it cannot be set in the image signal processor chip, therefore, it is necessary to set an additional memory chip, such as a dynamic random access memory (DRAM) device; this additionally set device It will affect the size and manufacturing cost of the overall system, and it will also lead to slower memory access speed and memory access bandwidth problems
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[0016] figure 1 is a schematic diagram of a distorted image 102 with barrel distortion (caused by lens distortion) and a corrected image 104 that corrects the distortion. Such as figure 1 As shown, the distorted image 102 has several distorted lines 106, which respectively bend towards the optical center 108 away from the distorted image 102. As mentioned above, the distorted image 102 is shaped like a barrel or a sphere, so it can also be called a barrel. shape distortion. Here, although only barrel distortion is taken as an example for illustration, this embodiment can also be applied to other types of distortion, such as pincushion distortion, and a combination of barrel distortion and pincushion distortion (such as compound distortion), where , pincushion distortion is when the lines bend inward and toward the center of the image. Generally speaking, barrel distortion is usually paired with wide-angle lenses, while pincushion distortion is usually paired with zoom lense...
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The invention discloses a distortion correction device and method for distorted digital data of a distorted image, which is used to generate the corrected digital data of a corrected image, which divides the distorted digital data into a plurality of distortion data blocks, and respectively targets each distortion data area. The blocks are encrypted to obtain encrypted distortion data blocks respectively, define a plurality of correction areas of the corrected image, each correction area is respectively associated with a corresponding correction data block, and for each correction data block, identify a plurality of related encrypted distortion data block, decrypt a plurality of related encrypted and distorted data blocks to obtain a plurality of related decrypted and distorted data blocks, and use the related decrypted and distorted data blocks to generate modified image data of the modified data block.
Description
technical field [0001] The present invention relates to a distortion correction of digital image data, in particular to a distortion correction device and method of digital image data. Background technique [0002] Generally speaking, a digital imaging system includes more than one lens and a digital image sensor, wherein the digital image sensor captures the light from an object or the light of the picture imaged through the lens, and processes the captured light to convert it into an electronic signal. The electronic signal can represent a digital signal of light from an object or a picture, and this digital signal can be stored as digital image data in a semiconductor memory. The aforementioned digital imaging systems are generally applicable to different users, industrial uses and research purposes to generate still images and / or videos, which can be displayed on mobile phones, digital cameras and video cameras, web cameras, or other similar devices, for example. [000...
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IPC IPC(8): H04N5/357H04N19/176H04N19/40G06T5/00H04N25/00
CPCG06T2207/20021H04N19/176H04N19/40H04N25/61G06T5/80
Inventor 单继章熊成玉
Owner OMNIVISION TECH INC