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Methods and systems for transmitting an image with thumbnail data

專利號
US11178079B1
公開日期
2021-11-16
申請人
WhatsApp Inc.（US CA Menlo Park）
發(fā)明人
Aaron Patel; Jonathan Sheller
IPC分類
H04L12/58; H04L29/08; H04L9/06
技術領域
image,thumbnail,may,data,client,quality,messaging,in,or,blob
地域： CA CA Menlo Park

摘要

Exemplary embodiments relate to techniques for improving the speed and rendering quality of an image (e.g., a JPEG), particularly in an end-to-end encrypted environment. The image may be analyzed on the sending-client side and the image data may be broken into a thumbnail and a full-quality image, where the full-quality image data relies on the thumbnail data to render a high-quality image. The image is uploaded to a blob store, and a message is sent to the receiving client with image information. At the recipient side, the JPEG image data is retrieved from the blob store and the thumbnail is first rendered. Subsequently, as the remainder of the image data is received at the receiving client, the image is updated. Consequently, images are rendered faster, and the thumbnail can be automatically downloaded so that a user can determine if they wish to download the full image.

說明書

Alternatively or in addition, the payload 454 may include a list of where each scan from a progressive scan script begins. Accordingly, the image may be loaded as a progressive image (e.g., a progressive JPEG) by refreshing the UI each time a new scan is received. This may allow for further intermediate states within a particular image quality, if that image quality is made up of multiple scans (e.g., see the low-quality example in Table 1, below).

The payload 454 may also include the sender-calculated HMACs 462 for each image chunk. Upon receiving a chunk, the recipient may calculate its own HMAC for the chunk and compare it to the HMAC 462 in the image message 450. If the HMACs are the same, the recipient can verify the integrity of the received data. If the HMACs differ, then the data has either been corrupted or tampered with in transmission. The recipient may take appropriate action in this case, such as requesting a new copy of the data, or terminating the transmission.

Embodiment for Providing a Thumbnail and a Full Image

FIGS. 5-6B provide data flow diagrams and flow charts describing a first embodiment in which an image is broken into a thumbnail and full quality image. It is contemplated that the embodiment depicted in FIGS. 5A-6B may be employed in connection with any of the thumbnail/full image embodiments described above, and may be extended with the multi-scan embodiments depicted in FIGS. 7-8B.

權利要求

1
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