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羨慕 HTC One M8 的 Duo景深相機功能，可以呈現類似數位單眼的淺景深效果和光場相機的線拍照後對焦玩法嗎？現在 Google 推出新的 Google Camera App，Android 使用者透過它也能拍出類似的淺景深照片和先拍照後對焦效果，以及可拍攝 360 度全景照片 Photo Sphere 功能。
Google 今日在 Google Play 推出新的 Google Camera App，這款相機應用程式加入許多新功能，包含 Lens Blur 鏡頭模糊、Photo Sphere 全景相片和高達更高相素的 Panorama 全景功能。
▲Lens Blur 鏡頭模糊功能可拍出類似數位單眼的淺景深效果。
最受矚目的 Lens Blur 鏡頭模糊功能，可達成類似 HTC One M8 的 Duo 景深相機的拍攝效果，像是數位單眼相機的淺景深效果、以及光場相機的先拍照後對焦功能。Lens Blur 方法是連拍方式拍下多張相同取景的照片，透過 2D 至 3D 視訊轉換技術 Structure-from-Motion (SfM) 和 bundle adjustment 光束調整法，以及 Multi-View Stereo (MVS) 演算法、 Markov Random Field 馬爾可夫隨機場推理方法等多種方式算出深度圖（Depth Map / Z-Depth），越近的景物會呈現黑色、越遠是呈現白色。把照片換算為 3D 影像後即可後製出淺景深的效果。
也因為 Lens Blur 功能是以連拍方式將對焦點從前景帶到背景，因此 Google Camera 也能達成類似光場相機先拍照後對焦的效果，以及模擬不同光圈大小的景深拍攝效果。以上效果在某些旗艦手機有類似的功能，不過當使用者安裝 Google Camera 後都能享有這項功能。
▲Google Camera 會連拍多張照片，算出深度圖後即可了解 3D 位置，並套用模糊效果。
▲Lens Blur 鏡頭模糊功能也能達成類似光場相機的先拍照後對焦效果。
Photo Sphere 全景相片這相功能其實已經被 Google 欲藏在 Android 系統中，現在同樣搬上 Google Camera 讓大家更方便使用。它可拍下 360 度全景功能，並上傳至 Google Maps 分享，如果你還記得前陣子有人用 Google 地圖上傳立法院 360 度室內全景，就是透過Photo Sphere 全景相片拍攝並上傳的。Panorama 全景模式也提昇了解析度。
在介面上，Google Camera 也換上全新使用者介面，強調所有動作均可透過一個特大號的拍攝按鈕搞定，讓操作更直覺簡單。不過 Google Camera 僅支援 Android 4.4 以上版本，對於許多 Android 手機而言恐怕無法享受到這些新功能。
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羨慕 HTC One M8 的 Duo景深相機功能，可以呈現類似數位單眼的淺景深效果和光場相機的線拍照後對焦玩法嗎？現在 Google 推出新的 Google Camera App，Android 使用者透過它也能拍出類似的淺景深照片和先拍照後對焦效果，以及可拍攝 360 度全景照片 Photo Sphere 功能。
